The Best Rinnai Tankless Water Heaters in 2026: 13 Picks
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You are looking for the best Rinnai tankless water heaters to match your home’s specific hot water needs. This guide compares 13 models based strictly on their published specifications. Rinnai offers a range of units including indoor and outdoor condensing and non-condensing heaters, commercial boilers, and specialized venting accessories. The top pick is the Rinnai 11.1 GPM Condensing Dual-Fuel Water Heater, which leads for large homes running multiple fixtures simultaneously due to its high flow rate and efficiency. These selections reflect the technical data available on each listing.
Quick picks
Our 13 picks
Rinnai 11.1 GPM Condensing Dual-Fuel Water Heater
Best for: large homes running multiple fixtures simultaneously
- Fuel Type
- Natural Gas or Propane
- Flow Rate
- 11.1 GPM
- BTU
- 199k BTU
- Installation Location
- Indoor/Outdoor
- Venting Type
- Condensing
- Dimensions
- 30.1 × 18.5 × 30.1 inches
View on Amazon: Rinnai 11.1 GPM Condensing Dual-Fuel Water Heater
This condensing tankless water heater delivers up to 11.1 GPM, supporting up to seven fixtures at once. It achieves a 0.98 UEF rating and runs on either natural gas or propane using an adaptable gas control system. You can install it indoors or outdoors with the appropriate vent cap. It suits high-demand households needing continuous hot water across multiple simultaneous fixtures.
Pros
- Delivers up to 11.1 GPM to supply up to 7 fixtures at once
- High energy efficiency with a 0.98 UEF rating
- Smart Sense system operates on either natural gas or propane
- Versa Vent supports indoor or outdoor installation
Cons
- Outdoor installation requires purchasing the RX-OVC vent cap separately
- Controlr WiFi module is not included
- Labor warranty defaults to 1 year unless registered within 90 days
Good fit if
- You need to run up to 7 fixtures at the same time.
- You want fuel versatility between natural gas and propane.
- You require a high 0.98 UEF efficiency rating.
Skip if
- You want out-of-the-box WiFi control without buying separate modules.
- You have lower hot water demand that does not require 11.1 GPM capacity.
Verdict: Rinnai 11.1 GPM Condensing Tankless Water Heater delivers high flow rates and 0.98 UEF efficiency with dual-fuel support. It provides reliable whole-home output if you obtain the necessary outdoor venting cap or WiFi module.
Rinnai 6.1 GPM Outdoor Propane Water Heater
Best for: outdoor propane installations serving multiple fixtures
- Fuel Type
- Propane
- Flow Rate
- 6.1 GPM
- BTU
- 160k BTU
- Installation Location
- Outdoor
- Dimensions
- 24.6 x 14.1 x 10.8 in
- Venting Type
- Non-Condensing
This Rinnai outdoor unit is a non-condensing tankless water heater fueled by propane. It delivers a flow rate of up to 6.1 GPM to supply up to five fixtures at once. Measuring 24.6 by 14.1 by 10.8 inches and weighing 49.2 pounds, it mounts outside your home. It suits you if you use propane and want outdoor mounting without indoor venting.
Pros
- Delivers up to 6.1 GPM flow rate for up to 5 fixtures
- Outdoor installation eliminates indoor venting runs
- Built-in LED screen displays service reminders and error codes
- 15-year limited warranty on the heat exchanger
Cons
- WiFi control module is not included
- Rated strictly for outdoor installation
- Requires registration within 90 days to retain 5-year labor warranty
Good fit if
- You use propane fuel and prefer an exterior outdoor setup.
- You need a flow capacity of up to 6.1 GPM for multiple fixtures.
- You want a non-condensing model with an integrated diagnostic LED screen.
Skip if
- You require an indoor tankless water heater installation.
- You use natural gas rather than liquid propane.
- You want built-in WiFi connectivity out of the box.
Verdict: Rinnai Non-Condensing Outdoor Propane Water Heater provides steady propane-powered flow from an outdoor exterior mount. Its compact footprint and 6.1 GPM capacity make it a solid non-condensing choice for propane homes.
Rinnai 5.3 GPM Outdoor Propane Tankless Water Heater
Best for: outdoor propane setups with moderate flow needs
- Fuel Type
- Propane
- Flow Rate
- 5.3 GPM
- Installation Location
- Outdoor
- Dimensions
- 30 x 13 x 13 in
- Weight
- 33 pounds
View on Amazon: Rinnai 5.3 GPM Outdoor Propane Tankless Water Heater
This Rinnai outdoor propane tankless water heater delivers a flow rate of 5.3 GPM. At 33 pounds and measuring 30 by 13 by 13 inches, the unit mounts outside your home to save interior space. Built-in scale detection monitors performance over time. If you need dedicated outdoor propane water heating for multiple fixtures without taking up indoor utility room square footage, this setup fits your requirements.
Pros
- Delivers a 5.3 GPM maximum water flow rate
- Outdoor installation frees up interior wall space
- Weighs 33 pounds for straightforward exterior mounting
- Includes built-in scale detection technology
Cons
- Designed strictly for outdoor installation
- Requires a dedicated propane fuel connection
- Lower 5.3 GPM flow rate than larger 6.5 GPM variants
Good fit if
- You have an exterior wall location ready for propane hookups.
- You need up to 5.3 GPM of hot water output.
- You want to preserve indoor square footage by mounting outdoors.
Skip if
- You need an indoor-mounted water heater.
- You run your appliances on natural gas instead of propane.
- You require higher flow rates than 5.3 GPM for peak household demand.
Verdict: Rinnai 5.3 GPM Outdoor Propane Tankless Water Heater provides dependable exterior on-demand hot water with a compact 33-pound footprint. It delivers 5.3 GPM flow capacity without taking up indoor space.
Rinnai 7.5 GPM Outdoor Propane Tankless Water Heater
Best for: propane homes needing outdoor multi-fixture capacity
- Fuel Type
- Propane
- Flow Rate
- 7.5 GPM
- Installation Location
- Outdoor
- Dimensions
- 35 x 14.5 x 22 inches
- Weight
- 63 pounds
View on Amazon: Rinnai 7.5 GPM Outdoor Propane Tankless Water Heater
This outdoor propane tankless water heater delivers up to 7.5 GPM of flow, which is enough to supply up to six appliances at once. It weighs 63 pounds and measures 35 by 14.5 by 22 inches. You get dedicated outdoor placement that frees up indoor floor space. It suits your household if you run on propane and need dependable multi-fixture supply.
Pros
- Delivers up to 7.5 GPM flow rate to serve up to 6 appliances at once
- Outdoor installation eliminates indoor footprint
- 12-year heat exchanger, 5-year parts, and 1-year labor residential warranty
Cons
- Restricted to propane fuel sources
- Exterior mounting only
Good fit if
- You run your household appliances on propane fuel.
- You need up to 7.5 GPM to run multiple fixtures at the same time.
- You want an exterior installation to save interior space.
Skip if
- You need a natural gas connection.
- You require an indoor water heater.
Verdict: Rinnai RUS Series 7.5 GPM Outdoor Propane Water Heater provides reliable 7.5 GPM capacity for exterior propane setups. It supplies multi-appliance demand without consuming indoor living space.
Rinnai I-SERIES Plus Condensing Combi Boiler
Best for: Combined home heating and domestic hot water
- Fuel Type
- Natural Gas, Propane
- Installation Location
- Indoor
- Dimensions
- 45.3 x 19.5 x 19.5 in
- Use
- Commercial, Boiler
- Venting Type
- Condensing
- Weight
- 79.4 pounds
View on Amazon: Rinnai I-SERIES Plus Condensing Combi Boiler
This indoor condensing combi boiler supplies domestic hot water and home space heating from one appliance. It delivers 175,000 BTU for space heating alongside 199,000 BTU for hot water, backed by a 96% AFUE efficiency rating. You can run it on natural gas or propane and monitor performance via built-in Wi-Fi. It suits you if you need whole-home heating combined with continuous hot water in a single setup.
Pros
- 96% AFUE thermal efficiency rating
- Dual-purpose design handles space heating and domestic hot water
- 175K BTU central heating and 199K BTU hot water capacity
- Built-in Smart Connect Wi-Fi and digital front panel display
- Supports common venting for up to 8 units
Cons
- Indoor installation only
- Requires registration within 90 days to avoid reduced 1-year labor warranty
- Large physical footprint at 45.3 inches tall and 79.4 pounds
Good fit if
- You want one appliance to manage both space heating and domestic hot water.
- You need a high-efficiency 96% AFUE unit compatible with natural gas or propane.
- You prefer managing system settings remotely via Wi-Fi.
Skip if
- You only require a dedicated water heater without home space heating.
- You need an outdoor-mounted water heating unit.
Verdict: Rinnai I-Series Plus Condensing Combi Boiler pairs whole-home central heating with high-output domestic hot water at 96% AFUE efficiency. It delivers a streamlined dual-purpose setup for indoor natural gas or propane configurations.
Rinnai 9 GPM Dual-Fuel Tankless Water Heater
Best for: commercial properties needing dual-fuel internal recirculation
- Fuel Type
- Propane or Natural Gas
- Flow Rate
- 9 GPM
- BTU
- 160,000 BTU
- Installation Location
- Indoor/Outdoor
- Dimensions
- 30.1 x 30.1 x 18.5 inches
- Use
- Commercial
View on Amazon: Rinnai 9 GPM Dual-Fuel Tankless Water Heater
The Rinnai SENSEI 9 GPM Commercial Water Heater provides up to 160,000 BTU for commercial applications, serving up to six fixtures simultaneously. It operates on either natural gas or propane and achieves a 0.97 UEF efficiency rating. An integrated recirculation pump automates flow patterns based on your demand. This unit suits you if you need commercial-grade output with flexible venting and fuel choices.
Pros
- Supplies up to 9 GPM to power up to six fixtures at once
- Smart Sense system runs on either natural gas or propane
- Integrated pump features Smart-Circ scheduled recirculation
- High efficiency operation rated at 0.97 UEF
Cons
- Outdoor installation requires a separate RX-OVC vent cap
- WiFi control requires purchasing an optional Controlr module
Good fit if
- You need up to 9 GPM of flow across multiple commercial fixtures.
- You want an integrated recirculation pump without external plumbing additions.
- You require versatility to run on either natural gas or propane.
Skip if
- You want out-of-the-box WiFi monitoring without extra hardware.
- You need higher capacity than 160,000 BTU or 9 GPM.
Verdict: Rinnai SENSEI 9 GPM Commercial Water Heater delivers 160,000 BTU and multi-fixture capacity with adaptable dual-fuel support. Its internal recirculation pump and 0.97 UEF rating make it an efficient option for commercial demands.
Rinnai Smart-Circ Outdoor Natural Gas Water Heater
Best for: outdoor natural gas setups needing recirculation
- Fuel Type
- Natural Gas
- Flow Rate
- 7.9 GPM
- BTU
- 199k BTU
- Installation Location
- Outdoor
- Dimensions
- 24.6 x 14.1 x 10.8 inches
View on Amazon: Rinnai Smart-Circ Outdoor Natural Gas Water Heater
This Rinnai outdoor water heater runs on natural gas and delivers up to 7.6 GPM, supporting up to six fixtures at once. It features built-in Smart-Circ recirculation that schedules hot water based on your household habits. Measuring 24.6 by 14.1 by 10.8 inches, it mounts outdoors to save indoor wall space. It suits you if you need whole-home outdoor gas heating with integrated water recirculation.
Pros
- Built-in Smart-Circ recirculation pump learns usage patterns
- Delivers up to 7.6 GPM to run up to six fixtures at once
- Compact outdoor footprint measuring 24.6 by 14.1 by 10.8 inches
- Up to 15-year heat exchanger and 5-year labor warranty upon 90-day registration
Cons
- Outdoor installation only
- WiFi control requires a separate Controlr module not included
- Labor warranty defaults to one year if not registered within 90 days
Good fit if
- You need an outdoor natural gas water heater that delivers up to 7.6 GPM.
- You want built-in recirculation without purchasing a separate external pump.
- You plan to run up to six fixtures simultaneously.
Skip if
- You need an indoor installation or use propane fuel.
- You want out-of-the-box WiFi control without purchasing an add-on module.
Verdict: Rinnai Smart-Circ Outdoor Natural Gas Water Heater delivers whole-home outdoor heating with an integrated recirculation pump that learns your routine. It provides reliable multi-fixture capacity while keeping venting requirements outside your home.
Rinnai Commercial 9 GPM Indoor Condensing Water Heater
Best for: indoor commercial facilities using natural gas
- Fuel Type
- Natural Gas
- Flow Rate
- 9 GPM
- Installation Location
- Indoor
- Dimensions
- 33.9 x 14.8 x 22.1 inches
- Use
- Commercial
- Venting Type
- Condensing
View on Amazon: Rinnai Commercial 9 GPM Indoor Condensing Water Heater
This indoor condensing unit delivers up to 9 GPM of hot water using natural gas for commercial applications. It includes Circ-Logic recirculation control and Wi-Fi monitoring to manage hot water demands throughout your facility. Measuring 33.9 by 14.8 by 22.1 inches and weighing 72.3 pounds, it provides high-capacity output in a wall-mounted profile. It suits you if your business needs steady commercial-grade hot water from an indoor natural gas supply.
Pros
- Delivers up to 9 GPM hot water flow rate
- Circ-Logic technology enables scheduled recirculation patterns
- Wi-Fi monitoring supports hot water management
- Includes commercial warranty coverage for heat exchanger, parts, and labor
Cons
- Built for indoor installation only
- Restricted to natural gas supply rather than propane
- Requires professional installation by a qualified technician
Good fit if
- You need a commercial-rated 9 GPM flow rate for your business.
- You operate an indoor facility connected to natural gas.
- You want recirculation scheduling and Wi-Fi tracking capability.
Skip if
- You need an outdoor-mounted water heater.
- You use propane fuel rather than natural gas.
Verdict: Rinnai Commercial 9 GPM Indoor Condensing Water Heater supplies dependable high-volume output for indoor commercial facilities. Its 9 GPM flow rate and integrated Circ-Logic controls handle continuous daily business demands.
Rinnai 9 GPM Outdoor Propane Condensing Heater
Best for: outdoor propane setups needing built-in recirculation
- Fuel Type
- Propane
- Flow Rate
- 9 GPM
- Installation Location
- Outdoor
- Dimensions
- 33.9 x 14.8 x 22.1 inches
- Venting Type
- Condensing
- Weight
- 80.9 pounds
View on Amazon: Rinnai 9 GPM Outdoor Propane Condensing Heater
This Rinnai outdoor condensing tankless heater delivers up to 9 GPM using propane fuel. It includes built-in ThermaCirc360 technology with an integrated recirculation pump, timer, and thermal bypass valve for systems without a dedicated return line. It suits you if you need an exterior propane unit with Wi-Fi monitoring and built-in recirculation capabilities.
Pros
- ThermaCirc360 with built-in recirculation pump, timer, and bypass valve
- Delivers up to 9 GPM hot water flow rate
- Supports Wi-Fi monitoring
Cons
- Discontinued by manufacturer
- Configured only for outdoor installation
Good fit if
- You need outdoor propane installation with up to 9 GPM flow rate.
- You want built-in recirculation without installing a dedicated return line.
Skip if
- You require an indoor water heater or natural gas fuel.
- You prefer a current production model instead of a discontinued unit.
Verdict: Rinnai Outdoor Propane Tankless Water Heater 9 GPM provides high-capacity outdoor propane heating with an integrated recirculation pump and bypass valve. Note that the manufacturer lists this specific model as discontinued in favor of the RSC160eP.
Rinnai Indoor Propane Condensing Tankless Water Heater
Best for: propane homes needing high-capacity scheduled recirculation
- Fuel Type
- Propane
- Flow Rate
- Up to 9 GPM
- BTU
- 160,000 BTU
- Installation Location
- Indoor
- Dimensions
- 9 x 9 x 9 inches
- Venting Type
- Condensing
View on Amazon: Rinnai Indoor Propane Condensing Tankless Water Heater
This indoor condensing tankless water heater runs on propane and delivers up to 9 GPM at 160,000 BTU. It uses built-in Smart-Circ technology to learn your hot water habits and run its internal recirculation pump accordingly. You get enough flow to handle up to six fixtures at once, making it a reliable fit for medium-to-large propane-powered homes requiring steady indoor output.
Pros
- Up to 9 GPM flow rate supports up to six fixtures simultaneously
- Smart-Circ technology learns usage patterns to automate recirculation
- Condensing design with 160,000 BTU propane heating capacity
- 15-year heat exchanger warranty for residential installations
Cons
- Wi-Fi control requires a separate Control-R module
- Indoor installation requires dedicated venting and propane hookups
Good fit if
- You need a propane-fired indoor unit that supports up to six fixtures.
- You want automated recirculation scheduling that adapts to your routine.
Skip if
- You heat your home with natural gas instead of propane.
- You want built-in Wi-Fi connectivity without purchasing add-on accessories.
Verdict: Rinnai Indoor Propane Condensing Tankless Water Heater delivers robust 9 GPM propane performance with automated recirculation for high-demand homes. It provides continuous indoor hot water if you do not mind purchasing the Wi-Fi module separately.
Rinnai 9 GPM Indoor Condensing Natural Gas Heater
Best for: high-demand indoor natural gas homes
- Fuel Type
- Natural Gas
- Flow Rate
- 9 GPM
- Installation Location
- Indoor
- Dimensions
- 31.3 x 11.5 x 18.5 inches
- Venting Type
- Condensing
- Weight
- 72.5 pounds
View on Amazon: Rinnai 9 GPM Indoor Condensing Natural Gas Heater
This indoor condensing unit runs on natural gas and delivers up to 9 GPM of hot water to serve up to six appliances at once. It features an Energy Star qualification with a 0.97 Uniform Energy Factor for high efficiency. This heater suits you if you need dependable indoor capacity for natural gas and plan to pair it with an external pump for recirculation.
Pros
- Delivers up to 9 GPM to supply up to 6 appliances at once
- High efficiency with a 0.97 Uniform Energy Factor and Energy Star rating
- Circ-Logic support for scheduled or on-demand recirculation
- Residential warranty covers 15 years on heat exchanger, 5 on labor, and 1 on parts
Cons
- Requires a separate external pump for recirculation
- Controlr Wi-Fi module is not included
- Restricted to indoor installation
Good fit if
- You use natural gas and need an indoor installation.
- You need up to 9 GPM of flow for multiple simultaneous appliances.
- You plan to use an external pump for hot water recirculation.
Skip if
- You need an outdoor installation or propane fuel.
- You want built-in Wi-Fi monitoring included out of the box.
- You want an internal recirculation pump rather than adding an external one.
Verdict: Rinnai 9 GPM Indoor Condensing Natural Gas Water Heater delivers strong 9 GPM flow and a 0.97 Uniform Energy Factor for indoor setups. It requires separate hardware purchases if you want recirculation or Wi-Fi connectivity.
Rinnai Concentric Vent Condensate Collector
Best for: LSI and RCI series concentric venting setups
- Dimensions
- 1 x 1 x 1 inches
- Weight
- 1 pounds
The Rinnai Concentric Vent Condensate Collector is a venting accessory designed for your Rinnai LSI and RCI series tankless water heaters. It fits 3-inch by 5-inch concentric vent systems and features a 6-inch length. With zero clearance to combustibles rating, you can install it safely in tight venting layouts. It suits you if you need to manage flue condensation on compatible Rinnai indoor installations.
Pros
- Zero clearance to combustibles rating
- Fits 3-inch by 5-inch concentric venting
- Designed for Rinnai LSI and RCI series heaters
- Compact 6-inch length
Cons
- Venting component rather than a standalone water heater
- Limited to Rinnai LSI and RCI series models
- Comes with no exterior finish
Good fit if
- You run 3-inch by 5-inch concentric venting on an LSI or RCI unit.
- You require zero clearance to combustible materials along the vent run.
- You need a dedicated 6-inch inline condensate collector section.
Skip if
- You need a complete tankless water heater instead of an accessory.
- You own a Rinnai unit outside the LSI or RCI series.
- You use non-concentric vent pipe.
Verdict: Rinnai Concentric Vent Condensate Collector provides zero-clearance drainage integration for 3-inch to 5-inch concentric pipe runs. It is a dedicated vent fitting built specifically for compatible Rinnai LSI and RCI installations.
Rinnai 9 GPM Indoor Natural Gas Tankless Water Heater
Best for: indoor natural gas homes needing multi-fixture recirculation
- Fuel Type
- Natural Gas
- Flow Rate
- Up to 9 GPM
- BTU
- 160,000 BTU/hr
- Installation Location
- Indoor
- Dimensions
- 33.9 x 21.3 x 14.4 inches
- Venting Type
- Condensing
View on Amazon: Rinnai 9 GPM Indoor Natural Gas Tankless Water Heater
This indoor condensing unit delivers up to 9 GPM of hot water using natural gas and a 160,000 BTU burner. It includes built-in recirculation logic that tracks your water consumption habits to run the pump automatically. With enough flow to supply up to six fixtures simultaneously, you get reliable whole-home heating. It suits medium to large indoor setups where you want scheduled recirculation without separate pump hardware.
Pros
- Delivers up to 9 GPM flow rate to support up to 6 fixtures at once
- Smart-Circ technology learns usage patterns to automate recirculation schedules
- 160,000 BTU/hr heating input with condensing technology
- 15-year heat exchanger, 5-year labor, and 1-year parts residential warranty
Cons
- Controlr WiFi module is not included and must be added separately
- Indoor installation only and restricted to natural gas supplies
Good fit if
- You need up to 9 GPM of hot water across multiple fixtures simultaneously.
- You have an indoor setup with an active natural gas supply line.
- You want automated water recirculation that learns your daily schedule.
Skip if
- You need an outdoor installation or utilize liquid propane for fuel.
- You require out-of-the-box Wi-Fi control without purchasing additional accessories.
Verdict: Rinnai 9 GPM Indoor Natural Gas Tankless Water Heater provides strong multi-fixture flow and automated recirculation tracking for indoor spaces. It is a capable choice if your household runs on natural gas and requires dependable high-demand performance.
Specifications side by side
| Spec | Rinnai 11.1 GPM Condensing Dual-Fuel Water Heater | Rinnai 6.1 GPM Outdoor Propane Water Heater | Rinnai 5.3 GPM Outdoor Propane Tankless Water Heater | Rinnai 7.5 GPM Outdoor Propane Tankless Water Heater | Rinnai I-SERIES Plus Condensing Combi Boiler | Rinnai 9 GPM Dual-Fuel Tankless Water Heater | Rinnai Smart-Circ Outdoor Natural Gas Water Heater | Rinnai Commercial 9 GPM Indoor Condensing Water Heater | Rinnai 9 GPM Outdoor Propane Condensing Heater | Rinnai Indoor Propane Condensing Tankless Water Heater | Rinnai 9 GPM Indoor Condensing Natural Gas Heater | Rinnai Concentric Vent Condensate Collector | Rinnai 9 GPM Indoor Natural Gas Tankless Water Heater |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Fuel Type | Natural Gas or Propane | Propane | Propane | Propane | Natural Gas, Propane | Propane or Natural Gas | Natural Gas | Natural Gas | Propane | Propane | Natural Gas | not specified | Natural Gas |
| Flow Rate | 11.1 GPM | 6.1 GPM | 5.3 GPM | 7.5 GPM | not specified | 9 GPM | 7.9 GPM | 9 GPM | 9 GPM | Up to 9 GPM | 9 GPM | not specified | Up to 9 GPM |
| BTU | 199k BTU | 160k BTU | not specified | not specified | not specified | 160,000 BTU | 199k BTU | not specified | not specified | 160,000 BTU | not specified | not specified | 160,000 BTU/hr |
| Installation Location | Indoor/Outdoor | Outdoor | Outdoor | Outdoor | Indoor | Indoor/Outdoor | Outdoor | Indoor | Outdoor | Indoor | Indoor | not specified | Indoor |
| Dimensions | not specified | 24.6 x 14.1 x 10.8 in | 30 x 13 x 13 in | 35 x 14.5 x 22 inches | 45.3 x 19.5 x 19.5 in | 30.1 x 30.1 x 18.5 inches | 24.6 x 14.1 x 10.8 inches | 33.9 x 14.8 x 22.1 inches | 33.9 x 14.8 x 22.1 inches | 9 x 9 x 9 inches | 31.3 x 11.5 x 18.5 inches | 1 x 1 x 1 inches | 33.9 x 21.3 x 14.4 inches |
| Use | not specified | not specified | not specified | not specified | Commercial, Boiler | Commercial | not specified | Commercial | not specified | not specified | not specified | not specified | not specified |
| Venting Type | Condensing | Non-Condensing | not specified | not specified | Condensing | not specified | not specified | Condensing | Condensing | Condensing | Condensing | not specified | Condensing |
| Weight | 55 pounds | 49.2 pounds | 33 pounds | 63 pounds | 79.4 pounds | 60 pounds | not specified | 72.3 pounds | 80.9 pounds | 78 pounds | 72.5 pounds | 1 pounds | 66 pounds |
| Size | 11.1 GPM | 6.6 GPM | 5.3 GPM | 7.5 GPM | 175K BTU / DHW 199K BTU | 9 GPM | 7.9 GPM | not specified | 9 GPM | not specified | 9 GPM | not specified | not specified |
| Color | Silver | Silver | V53DeP - Propane/5.3 GPM | Outdoor Installation | Gray | Silver | Silver | CU160in - Natural Gas/9 GPM | Outdoor Installation | Gray | Silver | No Finish | Gray |
| Model | RX199iN | REU-VE2125WD-US-P | V53DeP | RUS Series | IP175199C | CXP160iN | REU-VEP2737WD-US-N | CU160iN | RUR160ep | RSC160iP | RU160in | 224069 | RSC160iN |
Rinnai Tankless Water Heater Models
Rinnai’s lineup spans indoor and outdoor units with natural gas, propane, and dual-fuel options. You can choose from condensing or non-condensing venting types depending on your home’s infrastructure. The Rinnai 11.1 GPM Condensing Dual-Fuel Water Heater leads with high flow for large homes. For outdoor propane needs, the 6.1 GPM Outdoor Propane Water Heater offers a compact non-condensing solution. The 5.3 GPM Outdoor Propane Tankless Water Heater suits moderate flow requirements with a small footprint.
Commercial buyers might prefer the 9 GPM Dual-Fuel Tankless Water Heater for its internal recirculation pump. The Rinnai I-SERIES Plus Condensing Combi Boiler combines central heating with domestic hot water. Indoor natural gas setups often use the 9 GPM Indoor Condensing Natural Gas Heater. These models vary in size, weight, and efficiency to match specific installation constraints.
Where Rinnai Fits Your Home
Rinnai covers flow needs from 5.3 to 11.1 GPM for residential use, plus 9 GPM commercial units. You can select outdoor or indoor installation, with propane, natural gas, or dual-fuel support. Condensing venting is standard for most indoor models, while outdoor units vary. The range includes a combi boiler for central heating. However, no listed product offers a built-in Wi-Fi module or integrated recirculation pump without separate purchase. You must verify venting caps and connectivity hardware availability before buying.
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How to choose the right Rinnai unit
-
Check your fuel source
Your home’s existing energy infrastructure dictates which models are viable. Rinnai offers natural gas, propane, and dual-fuel options. If you have natural gas, the Rinnai 9 GPM Indoor Condensing Natural Gas Heater provides reliable indoor performance. Propane users can choose the Rinnai 6.1 GPM Outdoor Propane Water Heater for exterior setups. Dual-fuel models like the top-ranked Rinnai 11.1 GPM Condensing Dual-Fuel Water Heater offer flexibility. Verify your fuel type before comparing other specs to ensure compatibility with your home’s supply lines.
-
Decide on installation location
Installation location affects venting requirements and space usage. Outdoor units like the Rinnai 7.5 GPM Outdoor Propane Tankless Water Heater save indoor space and simplify venting. They are ideal for garages or exterior walls. Indoor models, such as the Rinnai 9 GPM Indoor Condensing Natural Gas Heater, require careful placement due to venting needs. Some indoor units are compact, like the Rinnai Indoor Propane Condensing Tankless Water Heater at 9 inches wide. Choose outdoor for space savings and indoor for aesthetic integration, depending on your layout.
-
Match flow rate to usage
Flow rate determines how many fixtures can run simultaneously. For large homes, the Rinnai 11.1 GPM Condensing Dual-Fuel Water Heater supports multiple bathrooms. Smaller households may find the Rinnai 5.3 GPM Outdoor Propane Tankless Water Heater sufficient. Commercial needs often require 9 GPM units like the Rinnai Commercial 9 GPM Indoor Condensing Water Heater. Check the GPM spec against your peak usage. Higher GPM means better simultaneous performance but may require larger gas lines. Match the number to your household size and fixture count.
-
Select venting type wisely
Venting type impacts efficiency and installation complexity. Condensing models, like the Rinnai 11.1 GPM Condensing Dual-Fuel Water Heater, are more efficient and use smaller pipes. They are suitable for indoor and outdoor use. Non-condensing units, such as the Rinnai 6.1 GPM Outdoor Propane Water Heater, require larger vent pipes and are typically outdoor-only. Condensing units capture heat from exhaust, boosting efficiency. Choose condensing for efficiency and indoor flexibility. Choose non-condensing only for specific outdoor propane applications where venting size is not a constraint.
-
Consider recirculation needs
Recirculation pumps deliver hot water faster by keeping pipes warm. The Rinnai Smart-Circ Outdoor Natural Gas Water Heater includes an integrated pump that learns your routine. The Rinnai 9 GPM Outdoor Propane Condensing Heater also features a built-in pump and bypass valve. If you want instant hot water, look for these integrated features. Some models require separate purchases for recirculation. Check the product attributes for pump inclusion. This feature reduces water waste and wait time, adding convenience for large homes with long pipe runs.
Frequently asked questions
Which Rinnai tankless water heater is best for large homes?
The Rinnai 11.1 GPM Condensing Dual-Fuel Water Heater is the top pick for large homes. It delivers high flow rates and 0.98 UEF efficiency. This model supports dual fuel types and provides reliable whole-home output. You must obtain the necessary outdoor venting cap or WiFi module for full functionality.
What is the best non-condensing Rinnai option?
The Rinnai 6.1 GPM Outdoor Propane Water Heater is the best non-condensing choice. It provides steady propane-powered flow from an outdoor exterior mount. Its compact footprint and 6.6 GPM capacity make it a solid option for propane homes. The unit measures 14.1 inches wide and weighs 49.2 pounds.
Is there a budget-friendly Rinnai model for outdoor use?
Yes, the Rinnai 5.3 GPM Outdoor Propane Tankless Water Heater is the best budget pick. It provides dependable exterior on-demand hot water with a compact 33-pound footprint. It delivers 5.3 GPM flow capacity without taking up indoor space. The model measures 13 inches wide and 30 inches high.
Which Rinnai unit is best for outdoor propane setups?
The Rinnai 7.5 GPM Outdoor Propane Tankless Water Heater is ideal for outdoor propane setups. It provides reliable 7.5 GPM capacity for exterior installations. It supplies multi-appliance demand without consuming indoor living space. The unit weighs 63 pounds and measures 14.5 inches wide by 35 inches high.
Does Rinnai offer a combi boiler for heating and hot water?
The Rinnai I-SERIES Plus Condensing Combi Boiler combines whole-home central heating with domestic hot water. It delivers high-output performance at 96% AFUE efficiency. This streamlined dual-purpose setup works with indoor natural gas or propane configurations. The unit weighs 79.4 pounds and measures 45.3 inches high.
What is the best Rinnai heater for commercial properties?
The Rinnai SENSEI 9 GPM Commercial Water Heater is designed for commercial demands. It delivers 160,000 BTU and multi-fixture capacity with adaptable dual-fuel support. Its internal recirculation pump and 0.97 UEF rating make it an efficient option. The unit weighs 60 pounds and measures 18.5 inches wide.
Which Rinnai model includes a built-in recirculation pump?
The Rinnai Smart-Circ Outdoor Natural Gas Water Heater features an integrated recirculation pump. It learns your routine to provide reliable multi-fixture capacity. This outdoor unit keeps venting requirements outside your home. It delivers 7.9 GPM flow. Other models like the RUR160ep also include built-in recirculation pumps.
Are there discontinued Rinnai models I should know about?
The Rinnai Outdoor Propane Tankless Water Heater 9 GPM model RUR160ep is listed as discontinued. The manufacturer recommends the RSC160eP as its replacement. This unit previously provided high-capacity outdoor propane heating with an integrated recirculation pump and bypass valve. It weighed 80.9 pounds and measured 14.8 inches wide.