15 Best Tankless Water Heaters Under $1500, Compared
As an Amazon Associate we earn from qualifying purchases. Links on this page are affiliate links.
Finding the best tankless water heaters under $1500 requires balancing flow capacity, fuel type, and venting requirements. We compared 15 models using specifications published on the listings to help you select the right unit.
The Rinnai 10 GPM Dual-Fuel Condensing Tankless Heater earns the top spot with its 0.98 UEF efficiency rating and 10 GPM flow rate. This guide helps you evaluate fuel options, venting types, and physical dimensions so you can decide which heater matches your home's demand.
Quick picks
The best fit for you
- You need maximum efficiency for high water demands Rinnai 10 GPM Dual-Fuel Condensing Tankless Heater It delivers a 10 GPM flow rate with a 0.98 UEF condensing rating.
- You have propane and require maximum flow capacity Rheem IKONIC 11.2 GPM Propane Tankless Heater This indoor unit provides an 11.2 GPM flow rate and WiFi connectivity.
- You want outdoor natural gas installation without indoor venting Rheem RTG 9.5 GPM Outdoor Natural Gas Tankless Heater It provides a 9.5 GPM flow rate designed specifically for outdoor natural gas mounting.
- You run a demanding commercial water heating application Rinnai 9 GPM Commercial Tankless Water Heater It provides a 9 GPM capacity and 97 percent thermal efficiency for commercial use.
Our 15 picks
Rinnai 10 GPM Dual-Fuel Condensing Tankless Heater
Best for: large homes needing high-flow dual-fuel efficiency
- Fuel Type
- Propane or Natural Gas
- Flow Rate
- 10 GPM
- Installation Location
- Indoor/Outdoor
- Dimensions
- 31 x 19 x 19 inches
- Venting Type
- Condensing
- Weight
- 54 pounds
View on Amazon: Rinnai 10 GPM Dual-Fuel Condensing Tankless Heater
This Rinnai condensing unit delivers up to 10 GPM to serve up to six fixtures simultaneously. It supports both natural gas and propane through an adaptable gas control system and works indoors or outdoors. With a 0.98 UEF rating, it maximizes energy performance while maintaining a compact 54-pound footprint. It suits you if you need high-capacity hot water across multiple bathrooms and want flexible dual-fuel venting configurations.
Pros
- High flow rate of up to 10 GPM supports up to six fixtures simultaneously
- High energy efficiency with a 0.98 UEF rating
- Dual-fuel capability supports both natural gas and propane
- Versatile design allows for indoor or outdoor installation
Cons
- Outdoor installation requires purchasing a separate RX-OVC vent cap
- WiFi control requires a separate Controlr module that is not included
- Labor warranty reduces from five years to one year if not registered within 90 days
Good fit if
- You need up to 10 GPM to supply hot water for up to six fixtures at once.
- You want the option to run on either natural gas or propane.
- You want a high-efficiency 0.98 UEF condensing unit that installs indoors or outdoors.
Skip if
- You require out-of-the-box WiFi control without buying an add-on module.
- You want an outdoor installation without needing to source an extra vent cap.
Verdict: Rinnai 10 GPM Dual-Fuel Condensing Tankless Heater delivers top-tier 0.98 UEF efficiency alongside a robust 10 GPM flow rate for multiple fixtures. It offers versatile placement and fuel choices for high-demand homes.
Rinnai 7.6 GPM Indoor Propane Tankless Water Heater
Best for: indoor propane homes running multiple fixtures
- Fuel Type
- Propane
- Flow Rate
- 7.6 GPM
- Installation Location
- Indoor
- Dimensions
- 27.3 x 14.1 x 10.8 inches
- Venting Type
- Non-Condensing
- Weight
- 53.4 pounds
View on Amazon: Rinnai 7.6 GPM Indoor Propane Tankless Water Heater
This indoor non-condensing tankless water heater runs on propane and delivers up to 7.6 GPM of hot water, supporting up to six fixtures simultaneously. Measuring 27.3 by 14.1 by 10.8 inches and weighing 53.4 pounds, it mounts on your wall to save space. An integrated LED screen displays diagnostic codes. It suits medium-to-large households that need reliable propane-fueled indoor delivery across multiple fixtures.
Pros
- Delivers up to 7.6 GPM to support up to 6 fixtures at once
- Onboard LED display shows error codes and maintenance reminders
- Up to 15-year warranty on the heat exchanger
- Compact wall-mounted profile measuring 27.3 x 14.1 x 10.8 inches
Cons
- WiFi control requires purchasing a separate Controlr module
- Internal recirculation pump not included
- Labor warranty reduces to 1 year if unregistered after 90 days
Good fit if
- You use propane fuel and require an indoor wall-hung installation.
- You need sufficient hot water flow to supply up to six simultaneous fixtures.
- You want built-in digital error codes and service alerts directly on the unit.
Skip if
- You need a natural gas connection rather than liquid propane.
- You require an integrated recirculation pump straight from the factory.
- You want built-in WiFi connectivity without buying separate modules.
Verdict: Rinnai 7.6 GPM Indoor Propane Tankless Water Heater delivers dependable high-capacity flow for multi-bath propane homes. It provides a compact indoor footprint alongside straightforward onboard diagnostics.
Rheem RTG 9.5 GPM Natural Gas Water Heater
Best for: Multi-bathroom indoor homes using natural gas
- Fuel Type
- Natural Gas
- Flow Rate
- 9.5 GPM
- BTU
- 199,900 BTU/hr
- Installation Location
- Indoor
- Temperature Control
- ±1°F
- Certification
- CSA
This indoor natural gas tankless water heater supplies up to 9.5 GPM using a 199,900 BTU burner. Its non-condensing direct-vent setup fits interior walls and features integrated WiFi connectivity for monitoring. You can run 3 to 4 fixtures simultaneously while adjusting heat via a digital interface accurate to 1 degree Fahrenheit. It suits multi-bathroom homes that already have natural gas service and dedicated indoor direct venting in place.
Pros
- Delivers up to 9.5 GPM at 199,900 BTU/hr
- Built-in WiFi connectivity and digital LED control
- 15-year heat exchanger warranty and 5-year parts warranty
- Temperature adjustment precision of ±1°F
Cons
- Non-condensing design with 0.82 UEF rating
- Requires indoor direct venting setup
- Requires professional installation
Good fit if
- You need high output up to 9.5 GPM for 3 to 4 simultaneous fixtures.
- You have an indoor natural gas line and direct vent routing available.
- You want built-in WiFi monitoring with precision digital temperature settings.
Skip if
- You require a liquid propane water heater.
- You want an outdoor installation unit.
- You need a higher-efficiency condensing unit above 0.82 UEF.
Verdict: Rheem RTG 9.5 GPM Natural Gas Water Heater gives you high flow and integrated WiFi control for indoor natural gas setups. It delivers strong whole-house capacity if you do not require a condensing system.
Westinghouse 9.2 GPM Propane Indoor Tankless Heater
Best for: Large homes with propane supply
- Fuel Type
- Propane
- Flow Rate
- 9.2 GPM
- BTU
- 199,000 BTU
- Installation Location
- Indoor
- Voltage
- 120 V
- Temperature Control
- ±1.8°F
View on Amazon: Westinghouse 9.2 GPM Propane Indoor Tankless Heater
This Westinghouse unit delivers 199,000 BTU and 9.2 GPM for whole-home hot water. It uses propane and is designed for indoor installation. The system maintains temperature within ±1.8°F and includes freeze protection down to -13°F. It requires a 120V power source. You get consistent flow for multiple bathrooms. The copper heat exchanger supports reliable heating. This model suits large homes needing high output.
Pros
- 199,000 BTU output for high demand
- 9.2 GPM flow rate for whole-home use
- ±1.8°F temperature stability
- Freeze protection down to -13°F
Cons
- Indoor installation only
- Requires 120V electrical connection
- Heavier at 56.7 pounds
Good fit if
- You need high flow for 4+ bathrooms
- You have access to propane fuel
- You require indoor mounting space
Skip if
- You need outdoor installation
- You use natural gas instead of propane
- You lack a 120V power outlet nearby
Verdict: Westinghouse 9.2 GPM Propane Indoor provides strong 199,000 BTU performance for large households. It fits buyers who prioritize high flow and precise temperature control in an indoor setting.
Rheem RTG 9.5 GPM Outdoor Natural Gas Tankless Heater
Best for: large homes needing high-flow outdoor water heating
- Fuel Type
- Natural Gas
- Flow Rate
- 9.5 GPM
- BTU
- 199,900 BTU/hr
- Installation Location
- Outdoor
- Temperature Control
- ±1°F
- Certification
- CSA
View on Amazon: Rheem RTG 9.5 GPM Outdoor Natural Gas Tankless Heater
This Rheem RTG unit is an outdoor natural gas tankless water heater designed for high-demand homes. It delivers up to 9.5 GPM with a 199,900 BTU burner, supplying enough hot water for three to four simultaneous showers. Because you mount it outdoors, you do not need dedicated indoor exhaust venting. It suits large households that use natural gas and want whole-home capacity without indoor utility space.
Pros
- High flow rate up to 9.5 GPM powered by a 199,900 BTU burner
- Outdoor configuration eliminates the need for indoor exhaust venting
- Digital LED control panel supports precise adjustments within 1°F
- Built-in freeze protection and flame failure safety system
Cons
- Non-condensing design has a 0.82 Uniform Energy Factor
- Outdoor-only setup requires exterior wall mounting
- Lacks built-in Wi-Fi connectivity on this model option
Good fit if
- You have outdoor wall space and want to avoid installing venting runs.
- You run natural gas and need to supply three to four simultaneous showers.
- You want precision water temperature control in 1°F increments.
Skip if
- You need an indoor water heater installation.
- You use liquid propane rather than a natural gas supply.
- You require wireless monitoring or app control out of the box.
Verdict: Rheem RTG 9.5 GPM Outdoor Natural Gas Tankless Heater delivers high capacity for multi-bathroom homes without the hassle of indoor exhaust venting. It provides steady whole-house performance if you have natural gas and an exterior wall location.
Rheem RTGH 9.0 GPM Natural Gas Tankless Heater
Best for: indoor multi-bath homes using natural gas
- Fuel Type
- Natural Gas
- Flow Rate
- 9.0 GPM
- BTU
- 180,000 BTU/hr
- Installation Location
- Indoor
- Temperature Control
- ±1°F
- Certification
- CSA
View on Amazon: Rheem RTGH 9.0 GPM Natural Gas Tankless Heater
This indoor natural gas condensing unit delivers up to 9.0 GPM at a 35°F rise using 180,000 BTU/hr. It features a 0.93 Uniform Energy Factor, direct venting, and digital controls with one-degree precision. If you run three to four fixtures simultaneously and need whole-home natural gas water heating, this unit gives you high flow and low emissions in a compact frame.
Pros
- Maximum flow rate of 9.0 GPM at 35°F temperature rise
- High efficiency with a 0.93 Uniform Energy Factor
- 180,000 BTU/hr condensing burner with ultra-low NOx emissions
- 15-year heat exchanger and 5-year parts warranty coverage
Cons
- No built-in Wi-Fi support on this configuration
- Restricted to indoor direct-vent mounting
Good fit if
- You have an indoor setup location configured for natural gas.
- You need up to 9.0 GPM to run three to four fixtures simultaneously.
Skip if
- You require an outdoor installation.
- You use liquid propane fuel instead of natural gas.
Verdict: Rheem RTGH 9.0 GPM Natural Gas Tankless Heater delivers 180,000 BTU/hr condensing performance and a 0.93 UEF for indoor natural gas setups. It provides steady capacity for multi-fixture homes without built-in wireless features.
Rheem RTG 9.5 GPM Outdoor Propane Tankless Water Heater
Best for: outdoor propane setups needing high flow rates
- Fuel Type
- Liquid Propane
- Flow Rate
- 9.5 GPM
- BTU
- 199,900 BTU/hr
- Installation Location
- Outdoor
- Temperature Control
- ±1°F
- Certification
- CSA
View on Amazon: Rheem RTG 9.5 GPM Outdoor Propane Tankless Water Heater
This outdoor unit delivers up to 9.5 GPM using liquid propane and a 199,900 BTU burner. Because you mount it outside, you do not need dedicated indoor venting. It features a 0.82 Uniform Energy Factor, integrated Wi-Fi monitoring, and digital temperature control with single-degree precision. If you have propane service and need enough hot water to run three to four showers simultaneously, this model suits your home.
Pros
- Delivers up to 9.5 GPM flow rate at a 35°F rise
- High 199,900 BTU per hour thermal output
- Outdoor wall-mount installation requires no indoor exhaust venting
- Built-in Wi-Fi and digital LED temperature panel with ±1°F control
- 15-year heat exchanger and 5-year parts warranty coverage
Cons
- Outdoor installation only
- Requires liquid propane instead of natural gas
- Non-condensing design with 0.82 Uniform Energy Factor
Good fit if
- You use liquid propane and want an outdoor wall-mounted installation.
- You need flow capacity to support three to four simultaneous showers.
- You want wireless monitoring via built-in Wi-Fi.
Skip if
- You need an indoor water heater or use natural gas.
- You require a condensing unit with a higher UEF rating.
Verdict: Rheem RTG 9.5 GPM Outdoor Propane Tankless Water Heater delivers 199,900 BTU heating performance without the need for indoor venting. It provides ample volume for multi-bath households fueled by liquid propane.
Rheem RTGH 9.0 GPM Indoor Propane Tankless Water Heater
Best for: multi-bath homes using indoor liquid propane
- Fuel Type
- Liquid Propane
- Flow Rate
- 9.0 GPM at 35°F rise
- BTU
- 180,000 BTU/hr
- Installation Location
- Indoor
- Temperature Control
- Digital LED, ±1°F
- Certification
- CSA
View on Amazon: Rheem RTGH 9.0 GPM Indoor Propane Tankless Water Heater
This indoor condensing unit runs on liquid propane, burning up to 180,000 BTU/hr to deliver 9.0 GPM at a 35°F rise. It features a 0.93 Uniform Energy Factor, direct venting, and digital LED temperature control within 1°F. If you need whole-house propane capacity to run three to four showers at once without installing an outdoor unit, this model fits your setup.
Pros
- Delivers 9.0 GPM at a 35°F rise using 180,000 BTU/hr
- High efficiency 0.93 UEF condensing design
- Digital LED control precise to 1°F
- Built-in freeze protection and multi-point safety system
Cons
- Does not include Wi-Fi functionality
- Configured strictly for liquid propane, not natural gas
Good fit if
- You have a liquid propane supply and space for an indoor direct-vent unit.
- You need to supply hot water for three to four simultaneous showers.
Skip if
- You use natural gas rather than liquid propane.
- You want built-in Wi-Fi connectivity out of the box.
Verdict: Rheem RTGH 9.0 GPM Indoor Propane Tankless Water Heater delivers high-efficiency whole-home performance for propane-powered households that do not require smart features.
Rinnai 9 GPM Commercial Tankless Water Heater
Best for: commercial applications requiring high thermal efficiency
- Flow Rate
- 9 GPM
- BTU
- 160,000 BTU/hr
- Installation Location
- Indoor/Outdoor
- Dimensions
- 30.1 x 18.5 x 30.1 inches
- Use
- Commercial
- Weight
- 60 pounds
View on Amazon: Rinnai 9 GPM Commercial Tankless Water Heater
This Rinnai unit delivers 9 GPM of hot water output and 160,000 BTU/hr with 97 percent thermal efficiency. Built for commercial or residential use, it supports indoor or outdoor setup using the Versa-Vent cap. You can connect it via Bluetooth to the Rinnai Central app for monitoring. It suits you if you need a high-efficiency commercial unit with built-in Quick-Flush maintenance.
Pros
- 97% thermal efficiency with 160,000 BTU/hr maximum output
- Flow rate of 9 GPM
- Supports indoor and outdoor installation via Versa-Vent cap
- Bluetooth connectivity with the Rinnai Central app
Cons
- Internal recirculation pump kit is sold separately
- Total unit weight is 60 pounds
Good fit if
- You need commercial-grade equipment with up to 9 GPM flow rate.
- You want Bluetooth monitoring and management from a mobile device.
- You require flexible indoor or outdoor installation options.
Skip if
- You need built-in recirculation without buying an add-on pump kit.
- You require a flow rate greater than 9 GPM.
Verdict: Rinnai 9 GPM Commercial Tankless Water Heater delivers 97% thermal efficiency and versatile indoor or outdoor installation for demanding applications. It provides commercial-grade durability and mobile app control, provided you do not mind purchasing the recirculation pump kit separately.
Rheem IKONIC 11.2 GPM Propane Tankless Heater
Best for: High-demand propane homes needing smart controls
- Fuel Type
- Liquid Propane
- Flow Rate
- 11.2 GPM
- BTU
- 199,900 BTU/hr
- Installation Location
- Indoor
- Dimensions
- 28.6 x 17.3 x 13.7 inches
- Features
- WiFi
View on Amazon: Rheem IKONIC 11.2 GPM Propane Tankless Heater
This condensing indoor tankless unit runs on liquid propane and delivers up to 11.2 GPM with a 199,900 BTU burner. Built-in Wi-Fi lets you monitor water usage and adjust temperatures from a mobile device. Its compact casing requires one-half inch of side clearance. It suits you if you run multiple fixtures at once and need high-volume continuous hot water from a propane supply.
Pros
- Delivers up to 11.2 GPM flow rate
- 199,900 BTU condensing heat output
- Built-in EcoNet Wi-Fi for remote controls and usage tracking
- Tight one-half inch side-to-side clearance
Cons
- Built-in recirculation pump not included on this configuration
- Outdoor installation requires a separate conversion kit
- Unit weight is 77.6 pounds
Good fit if
- You need high flow rates up to 11.2 GPM for simultaneous fixtures.
- You use liquid propane for your heating fuel.
- You want mobile Wi-Fi monitoring for maintenance alerts and usage data.
Skip if
- You use natural gas rather than liquid propane.
- You require an integrated recirculation pump out of the box.
Verdict: Rheem IKONIC 11.2 GPM Propane Tankless Heater delivers top-tier flow rates and smart monitoring for homes configured for liquid propane. It handles heavy, simultaneous hot water demands without built-in recirculation hardware.
A. O. Smith 160K BTU Indoor Natural Gas Water Heater
Best for: Indoor natural gas homes seeking condensing efficiency
- Fuel Type
- Natural Gas
- BTU
- 160K BTU
- Installation Location
- Indoor
- Dimensions
- 36.1"H x 17.8"L x 17.8"W
View on Amazon: A. O. Smith 160K BTU Indoor Natural Gas Water Heater
This condensing indoor natural gas tankless unit delivers up to 160,000 BTU with an energy rating of up to 0.94 UEF. It pairs a primary copper heat exchanger with a secondary 316L stainless steel exchanger to protect against corrosion. Built-in safety features include an air-fuel ratio sensor and overheat cut-off fuse. If you have an indoor natural gas connection and need high-efficiency water heating, this wall-mounted model fits your home.
Pros
- High condensing efficiency up to 0.94 UEF
- Dual heat exchangers with commercial-grade copper primary and 316L stainless steel secondary
- Safety package includes air-fuel ratio sensor, overheat cut-off fuse, and exhaust temperature controls
- 15-year limited warranty covers scale-related failures
Cons
- Configured strictly for natural gas without propane compatibility
- Tall cabinet profile at 36.1 inches high
Good fit if
- You have an indoor natural gas line ready for a 160,000 BTU appliance.
- You want high condensing thermal performance up to 0.94 UEF.
- You prefer dual heat exchangers with 15-year scale-failure warranty coverage.
Skip if
- You need an outdoor water heater installation.
- You use liquid propane rather than natural gas.
Verdict: A. O. Smith 160K BTU Indoor Natural Gas Water Heater provides efficient 0.94 UEF condensing performance and robust dual heat exchangers for dedicated indoor gas setups. Its built-in safety controls and 15-year scale warranty offer dependable long-term operation.
Takagi Outdoor 8 GPM Natural Gas Water Heater
Best for: high-demand outdoor natural gas setups
- Fuel Type
- Natural Gas
- Flow Rate
- 8 GPM
- Installation Location
- Outdoor
- Dimensions
- 24.9 x 17.8 x 11.3 inches
- Venting Type
- Condensing
- Capacity
- 8 Gallon
View on Amazon: Takagi Outdoor 8 GPM Natural Gas Water Heater
This Takagi unit is an outdoor condensing tankless water heater running on natural gas. It delivers a flow rate of 8 gallons per minute, which supports multiple hot water fixtures simultaneously. Outdoor installation eliminates indoor venting runs, while the condensing design maximizes fuel efficiency. Computerized safety controls and pilotless ignition run demand-based heating. It suits your home if you have outdoor natural gas hookups and demand high-capacity continuous hot water.
Pros
- 8 GPM flow rate supports multiple simultaneous fixtures
- Outdoor installation requires no indoor exhaust venting
- Condensing design increases energy efficiency
- Meets SCAQMD Rule 1146.2 ultra-low NOx emission standards
- Electronic ignition eliminates the need for a standing pilot light
Cons
- Restricted to outdoor installation locations only
- Compatible only with natural gas supplies, not propane
Good fit if
- You need up to 8 GPM of continuous hot water for multiple fixtures.
- You have an exterior installation location with a natural gas hookup.
- You require an ultra-low NOx certified condensing unit.
Skip if
- You need an indoor water heater.
- You use liquid propane rather than natural gas.
Verdict: Takagi Outdoor 8 GPM Natural Gas Water Heater delivers high-capacity condensing performance without taking up interior utility space. Its outdoor build and ultra-low NOx certification make it a dependable natural gas solution for multi-bath demands.
Rheem IKONIC 8.4 GPM Natural Gas Water Heater
Best for: indoor natural gas retrofits on half-inch lines
- Fuel Type
- Natural Gas
- Flow Rate
- 8.4 GPM
- BTU
- 157,000 BTUs
- Installation Location
- Indoor
- Dimensions
- 28.6 x 17.3 x 13.7 inches
- Weight
- 77.6 pounds
View on Amazon: Rheem IKONIC 8.4 GPM Natural Gas Water Heater
The Rheem IKONIC 8.4 GPM Natural Gas Water Heater is an indoor condensing unit delivering up to 157,000 BTUs. It supplies a maximum flow rate of 8.4 GPM, sufficient for running multiple fixtures like showers and dishwashers simultaneously. The unit connects to standard 1/2-inch gas lines and supports flex venting for straightforward tank replacements. It fits your home if you need reliable natural gas performance without resizing existing supply lines.
Pros
- Delivers up to 8.4 GPM with a 157,000 BTU burner
- Dual condensing heat exchangers maximize heating efficiency
- Compatible with existing 1/2-inch gas supply lines
- Permits flexible venting, room air intake, and common venting
- Includes a 15-year limited warranty
Cons
- Designed only for indoor installation
- Heavier unit at 77.6 pounds requiring secure wall framing
- Lacks built-in recirculation found on higher trim options
Good fit if
- You have an indoor setup using natural gas with a 1/2-inch line.
- You need an 8.4 GPM output to support multiple fixtures at the same time.
- You want flexible venting options including room air intake for tank replacement.
Skip if
- You use liquid propane fuel or need an outdoor mounting location.
- You require integrated recirculation straight out of the box.
Verdict: Rheem IKONIC 8.4 GPM Natural Gas Water Heater delivers solid indoor condensing performance with easy 1/2-inch gas line compatibility. It is an efficient choice for whole-home retrofits without major plumbing modifications.
MIZUDO 10.3 GPM Propane Tankless Water Heater
Best for: high-demand propane households wanting smart controls
- Fuel Type
- Propane
- Flow Rate
- 10.3 GPM
- Temperature Control
- ±1°F, up to 149°F
View on Amazon: MIZUDO 10.3 GPM Propane Tankless Water Heater
This MIZUDO unit is a dedicated propane tankless water heater bundled with an included vent kit. It supplies whole-house hot water with a maximum flow rate of 10.3 GPM, making it suitable for multi-bath residences. The heater provides temperature control within ±1°F up to 149°F, activates at 0.53 GPM, and features integrated smart WiFi management. You will find it well suited for propane-powered homes needing high output.
Pros
- Delivers up to 10.3 GPM flow rate for whole-house use
- Includes bundled vent kit in the package
- Smart WiFi control for remote monitoring
- Precise ±1°F temperature adjustments up to 149°F
Cons
- Operates strictly on propane fuel
- Requires a minimum 0.53 GPM flow to trigger activation
Good fit if
- You heat your home water using a dedicated liquid propane supply.
- You need high hot-water volume reaching up to 10.3 GPM across multiple fixtures.
- You want wireless equipment management through smart WiFi control.
Skip if
- You use a natural gas line rather than propane.
- You frequently run single low-flow fixtures drawing under 0.53 GPM.
Verdict: MIZUDO 10.3 GPM Propane Tankless Water Heater provides high liquid propane flow capacity along with built-in WiFi monitoring and an included vent kit. It serves multi-fixture households that need up to 149°F output and activation down to 0.53 GPM.
Noritz 9.8 GPM Propane Tankless Water Heater
Best for: homes requiring high-flow propane water heating
- Fuel Type
- Liquid Propane
- Flow Rate
- 9.8 GPM
- BTU
- 180000 BTU
- Voltage
- 120 Volt
- Dimensions
- 24 × 8 × 9 inches
- Weight
- 65 pounds
View on Amazon: Noritz 9.8 GPM Propane Tankless Water Heater
This Noritz propane tankless water heater delivers a flow rate of up to 9.8 GPM with a 180,000 BTU heating capacity. It runs on liquid propane and requires a standard 120-volt electrical connection to operate. Measuring 24 inches long by 8 inches wide and weighing 65 pounds, it suits your home if you need high continuous hot water output across multiple fixtures without installing a storage tank.
Pros
- Delivers a high flow rate of up to 9.8 GPM
- 180,000 BTU heating capacity
- Standard 120-volt electrical requirement
- Compact footprint measuring 24 by 8 by 9 inches
Cons
- Restricted to liquid propane fuel supply
- Weighs 65 pounds, requiring solid wall support
Good fit if
- You have an existing liquid propane supply.
- You require up to 9.8 GPM of hot water for multiple fixtures.
- You have a 120-volt electrical outlet ready for installation.
Skip if
- You need a heater compatible with natural gas.
- You cannot mount a 65-pound unit securely.
Verdict: Noritz 9.8 GPM Propane Tankless Water Heater provides high-volume hot water output powered by liquid propane and standard 120-volt electricity. It is a solid choice for households that require strong flow across multiple fixtures simultaneously.
Specifications side by side
| Spec | Rinnai 10 GPM Dual-Fuel Condensing Tankless Heater | Rinnai 7.6 GPM Indoor Propane Tankless Water Heater | Rheem RTG 9.5 GPM Natural Gas Water Heater | Westinghouse 9.2 GPM Propane Indoor Tankless Heater | Rheem RTG 9.5 GPM Outdoor Natural Gas Tankless Heater | Rheem RTGH 9.0 GPM Natural Gas Tankless Heater | Rheem RTG 9.5 GPM Outdoor Propane Tankless Water Heater | Rheem RTGH 9.0 GPM Indoor Propane Tankless Water Heater | Rinnai 9 GPM Commercial Tankless Water Heater | Rheem IKONIC 11.2 GPM Propane Tankless Heater | A. O. Smith 160K BTU Indoor Natural Gas Water Heater | Takagi Outdoor 8 GPM Natural Gas Water Heater | Rheem IKONIC 8.4 GPM Natural Gas Water Heater | MIZUDO 10.3 GPM Propane Tankless Water Heater | Noritz 9.8 GPM Propane Tankless Water Heater |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Fuel Type | Propane or Natural Gas | Propane | Natural Gas | Propane | Natural Gas | Natural Gas | Liquid Propane | Liquid Propane | not specified | Liquid Propane | Natural Gas | Natural Gas | Natural Gas | Propane | Liquid Propane |
| Flow Rate | 10 GPM | 7.6 GPM | 9.5 GPM | 9.2 GPM | 9.5 GPM | 9.0 GPM | 9.5 GPM | 9.0 GPM at 35°F rise | 9 GPM | 11.2 GPM | not specified | 8 GPM | 8.4 GPM | 10.3 GPM | 9.8 GPM |
| BTU | not specified | not specified | 199,900 BTU/hr | 199,000 BTU | 199,900 BTU/hr | 180,000 BTU/hr | 199,900 BTU/hr | 180,000 BTU/hr | 160,000 BTU/hr | 199,900 BTU/hr | 160K BTU | not specified | 157,000 BTUs | not specified | 180000 BTU |
| Installation Location | Indoor/Outdoor | Indoor | Indoor | Indoor | Outdoor | Indoor | Outdoor | Indoor | Indoor/Outdoor | Indoor | Indoor | Outdoor | Indoor | not specified | not specified |
| Voltage | not specified | not specified | not specified | 120 V | not specified | not specified | not specified | not specified | not specified | not specified | not specified | not specified | not specified | not specified | 120 Volt |
| Temperature Control | not specified | not specified | ±1°F | ±1.8°F | ±1°F | ±1°F | ±1°F | Digital LED, ±1°F | not specified | not specified | not specified | not specified | not specified | ±1°F, up to 149°F | not specified |
| Certification | not specified | not specified | CSA | CSA | CSA | CSA | CSA | CSA | not specified | not specified | not specified | not specified | not specified | not specified | not specified |
| Dimensions | 31 x 19 x 19 inches | 27.3 x 14.1 x 10.8 inches | 24.2 x 13.5 x 10.3 inches | 24.8 x 15.9 x 15.9 inches | 20.8 x 13.5 x 9.4 inches | 23.7 x 17.7 x 9.8 inches | 20.8 x 13.5 x 9.4 inches | 23.7 x 17.7 x 9.8 inches | 30.1 x 18.5 x 30.1 inches | 28.6 x 17.3 x 13.7 inches | 36.1"H x 17.8"L x 17.8"W | 24.9 x 17.8 x 11.3 inches | 28.6 x 17.3 x 13.7 inches | not specified | not specified |
| Use | not specified | not specified | not specified | not specified | not specified | not specified | not specified | not specified | Commercial | not specified | not specified | not specified | not specified | not specified | not specified |
| Venting Type | Condensing | Non-Condensing | Non-Condensing | not specified | Non-Condensing | not specified | Non-Condensing | not specified | not specified | not specified | not specified | Condensing | not specified | not specified | not specified |
| Capacity | not specified | not specified | not specified | not specified | not specified | not specified | not specified | not specified | not specified | not specified | not specified | 8 Gallon | not specified | not specified | not specified |
| Features | not specified | not specified | WiFi | not specified | WiFi | WiFi | WiFi | WiFi | not specified | WiFi | not specified | not specified | not specified | not specified | not specified |
| Weight | 54 pounds | 53.4 pounds | 46.5 pounds | 56.7 pounds | 39.3 pounds | 59.9 pounds | 40.5 pounds | 59.9 pounds | 60 pounds | 77.6 pounds | not specified | not specified | 77.6 pounds | not specified | 65 pounds |
| Size | 10 GPM | 9.8 GPM | 9.5 GPM (WiFi) | not specified | 9.5 GPM (No WiFi) | 9.0 GPM (No WiFi) | 9.5 GPM (WiFi) | 9.0 GPM (Without WiFi) | 9 GPM | 11.2 GPM (no Recirc) | not specified | Medium | 8.4 GPM | not specified | not_applicable |
| Color | Silver | Silver | Gray | Grey 103PI | Gray | Gray | Gray | Gray | Silver | Gray | White | White | Gray | not specified | Liquid Propane |
| Model | RX180iN | REU-VE2737FFD-US-P | RTG-95DVELN-3 | HW199A0G-LP | RTG-95XLN-3 | RTGH-90DVLN-3 | RTG-95XELP-3 | RTGH-90DVLP-3 | CX160iN | RECTGH-S11iP | ATI-240HX3-N | T-H3S-OS-N | RECTGH-S84iN | not specified | NRC98-DV-LP |
Trade-offs in this price range
Units under $1500 offer high flow rates and smart connectivity, but they often require specific installation conditions. Many models are designed for indoor use with non-condensing venting, which limits placement flexibility compared to condensing units. You may find that outdoor models lack WiFi features to reduce cost. Additionally, some high-capacity propane units do not include built-in recirculation pumps. You must verify venting and fuel compatibility before purchasing.
- Indoor non-condensing models like the Rinnai REU-VE2737FFD-US-P require dedicated exhaust venting.
- Outdoor units like the Rheem RTG-95XLN-3 often omit WiFi connectivity.
- High-flow propane models like the Rheem RECTGH-S11iP exclude built-in recirculation hardware.
- Commercial units like the Rinnai CX160iN require separate purchase of recirculation pumps.
If you also plan a home spa setup, you can compare specifications for best saunas under 1500.
How we picked these heaters
We selected 15 tankless water heaters from Amazon listings priced Under $1500. The list prioritizes products currently in stock. We then ordered them by overall rating weighted by count, followed by how many of our core criteria each model meets. We show only one size or variant per product family to keep comparisons clear. All specifications come directly from the published listing details. We do not handle or test the units ourselves. Prices and availability update daily on the page. This list changes as stock and prices shift.
How to choose the right one
-
Match flow to your home
Flow rate determines how many fixtures run at once. The Rinnai 10 GPM Dual-Fuel model supports multiple bathrooms simultaneously. For smaller needs, the Rheem IKONIC 8.4 GPM fits half-inch gas lines. Check the GPM spec to ensure you have enough water volume. Higher numbers handle more simultaneous use. Lower numbers suit single-bath setups. Select the capacity that matches your household size.
-
Select the correct fuel
You must have the right gas supply. The Rheem RTG 9.5 GPM Outdoor Propane model requires liquid propane tanks. The Rinnai 7.6 GPM Indoor unit runs on propane too. Natural gas models like the Rheem RTG 9.5 GPM Natural Gas Water Heater need a utility line. Do not mix fuels. Verify your home’s supply before buying. Each unit is designed for a specific gas type.
-
Plan for indoor venting
Indoor units need exhaust paths. The Rinnai 10 GPM Dual-Fuel uses condensing venting for efficiency. The Rinnai 7.6 GPM Indoor Propane unit uses non-condensing venting. Both require careful planning for exhaust pipes. The A. O. Smith 160K BTU unit also uses condensing tech. Check the venting type in the specs. Non-condensing units often need larger pipes. Condensing units are more efficient but complex.
-
Choose outdoor or indoor
Location affects installation complexity. Outdoor models like the Rheem RTG 9.5 GPM Outdoor Natural Gas Tankless Heater avoid indoor venting entirely. They mount on exterior walls. Indoor units like the Rheem RTGH 9.0 GPM Natural Gas Tankless Heater require indoor space and venting. The Noritz 9.8 GPM Propane unit is indoor-only. Pick based on your available space and local codes.
-
Check smart features
WiFi allows remote monitoring. The Rheem RTG 9.5 GPM Natural Gas Water Heater includes WiFi for indoor control. The Rheem IKONIC 11.2 GPM Propane model also offers smart connectivity. The Rinnai 9 GPM Commercial unit supports mobile app control. Not all models have this. The Rheem RTGH 9.0 GPM Natural Gas Tankless Heater lacks built-in wireless features. Decide if remote control matters for your setup.
Frequently asked questions
Which tankless water heater is best for large homes with multiple bathrooms?
The Rinnai 10 GPM Dual-Fuel Condensing Tankless Heater is the top choice for large homes. It delivers a robust 10 GPM flow rate and 0.98 UEF efficiency. This model supports multiple fixtures simultaneously. It also offers versatile placement options with dual-fuel capability. The unit measures 19 inches wide and 31 inches tall. Its condensing design maximizes energy savings for high-demand households.
Do I need a condensing unit for indoor installation?
Not necessarily, but it depends on your efficiency goals. Non-condensing units like the Rinnai 7.6 GPM Indoor Propane model are designed for standard indoor venting. Condensing units, such as the Rinnai 10 GPM, achieve higher efficiency ratings like 0.98 UEF. They require specific venting materials but save more energy. Choose non-condensing for simpler indoor setups and condensing for maximum efficiency.
Can I install a tankless heater outdoors to save indoor space?
Yes, several models are built for exterior walls. The Rheem RTG 9.5 GPM Outdoor Natural Gas Tankless Heater avoids indoor exhaust venting entirely. It measures 13.5 inches wide and 20.8 inches tall. The Takagi Outdoor 8 GPM Natural Gas model is another outdoor option with ultra-low NOx certification. These units keep utility rooms clear and handle weather-resistant requirements.
Which models offer WiFi connectivity for remote control?
Several Rheem and Rinnai models include built-in WiFi. The Rheem RTG 9.5 GPM Natural Gas Water Heater features integrated WiFi control for indoor setups. The Rheem IKONIC 11.2 GPM Propane model also provides smart monitoring. The Rinnai 9 GPM Commercial unit offers mobile app control. These features allow you to adjust settings and monitor performance from your phone.
What is the difference between natural gas and propane units?
Fuel type dictates compatibility with your home supply. Natural gas units, like the Rheem RTG 9.5 GPM, connect to your existing gas line. Propane units, such as the Rinnai 7.6 GPM Indoor model, require a propane tank or bulk delivery. Both types offer high flow rates, but you must select the correct fuel configuration. Some models, like the Rinnai 10 GPM, support dual-fuel options.
How much space does a tankless water heater take up?
Tankless units are compact and wall-mounted. The Rinnai 10 GPM model measures 19 inches wide, 19 inches deep, and 31 inches tall. The Rheem RTG 9.5 GPM Outdoor Natural Gas model is smaller at 13.5 inches wide and 20.8 inches tall. Most indoor units fit within a 14 to 18 inch width. This small footprint saves floor space compared to traditional tank heaters.
Is a commercial tankless heater suitable for a large house?
Commercial models provide high durability and thermal efficiency. The Rinnai 9 GPM Commercial Tankless Water Heater delivers 97% thermal efficiency. It is rated for commercial applications but can handle high residential demands. The unit measures 18.5 inches wide and 30.1 inches tall. Note that you may need to purchase a recirculation pump kit separately for optimal performance.