Best Noritz Tankless Water Heaters: 9 Models Compared
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We compared 9 best noritz tankless water heaters to help you find the right unit. This guide covers outdoor natural gas and propane models, plus indoor condensing options. The top pick is the Noritz EZ Series Pro 11.1 GPM Natural Gas Heater, which leads due to its high 11.1 GPM flow rate and 199,900 BTU output. All selections are based strictly on the specifications published on the listings. You can trust these rankings to match your home’s fuel type and space requirements.
Quick picks
Our 9 picks
Noritz EZ Series Pro 11.1 GPM Natural Gas Heater
Best for: high-demand homes running natural gas
- Fuel Type
- Natural Gas
- Flow Rate
- 11.1 GPM
- BTU
- 199,900 BTU
- Installation Location
- Indoor/Outdoor
- Voltage
- 120 V
- Dimensions
- 11.8 x 18.1 x 26.1 in
View on Amazon: Noritz EZ Series Pro 11.1 GPM Natural Gas Heater
This natural gas unit provides hot water across multiple fixtures using a 199,900 BTU burner and an 11.1 GPM flow rate. It runs on a standard 120-volt electrical connection and supports indoor or outdoor installation. The cabinet measures 11.8 by 18.1 by 26.1 inches and weighs 77.2 pounds. It suits you if you need high water volume and use natural gas.
Pros
- Delivers up to 11.1 GPM flow rate
- High heat output at 199,900 BTU
- Flexible indoor or outdoor mounting
- Standard 120-volt electrical requirement
Cons
- Heavy 77.2-pound total weight
- Natural gas only with no propane support listed
Good fit if
- You need high output up to 11.1 GPM for simultaneous water usage.
- You have a natural gas line and a 120-volt outlet ready.
Skip if
- You require a liquid propane fuel source.
- You cannot mount a 77.2-pound unit.
Verdict: Noritz EZ Series Pro 11.1 GPM Natural Gas Heater delivers high-capacity 11.1 GPM flow and 199,900 BTU output for demanding natural gas setups. It provides versatile indoor or outdoor placement as long as your wall supports its 77.2-pound weight.
Noritz Outdoor Propane Tankless Water Heater
Best for: outdoor propane installations requiring 5.0 GPM
- Fuel Type
- Liquid Propane
- Flow Rate
- 5.0 Gpm
- BTU
- 120,000 Btuh
- Installation Location
- Outdoor
- Dimensions
- 26.6 x 17.6 x 10.7 inches
- Weight
- 33 pounds
View on Amazon: Noritz Outdoor Propane Tankless Water Heater
This Noritz outdoor tankless water heater delivers up to 5.0 GPM of flow using liquid propane. It generates up to 120,000 Btuh of heat output with low NOx emissions. Built strictly for outdoor placement, the 33-pound cabinet measures 26.6 by 17.6 by 10.7 inches, which eliminates the need for indoor venting. You will find it suits outdoor setups needing moderate flow rates without indoor utility space.
Pros
- Delivers up to 5.0 GPM flow rate
- Generates up to 120,000 Btuh heat output
- Outdoor installation requires no indoor exhaust venting
- Compact 33-pound cabinet weight
- Low NOx emissions performance
Cons
- Outdoor installation only; not suitable for indoor mounting
- Requires liquid propane supply; cannot run on natural gas
- 5.0 GPM capacity limits simultaneous high-demand fixtures
Good fit if
- You have an exterior mounting space with liquid propane fuel access.
- You need up to 5.0 GPM flow and 120,000 Btuh heating output.
- You want an outdoor unit that eliminates indoor exhaust venting requirements.
Skip if
- You need an indoor water heater.
- You use natural gas rather than liquid propane.
- You need flow rates higher than 5.0 GPM.
Verdict: Noritz 5.0 GPM Outdoor Liquid Propane Water Heater provides 120,000 Btuh and 5.0 GPM flow in a 33-pound exterior cabinet. It is built strictly for outdoor liquid propane installations that need steady hot water without dedicated indoor mechanical space.
Noritz Outdoor Natural Gas Water Heater 6.6 GPM
Best for: moderate-demand outdoor natural gas setups
- Fuel Type
- Natural Gas
- Flow Rate
- 6.6 Gpm
- BTU
- 140,000 Btuh
- Installation Location
- Outdoor
- Dimensions
- 26.6 x 17.6 x 10.7 inches
- Weight
- 36 pounds
View on Amazon: Noritz Outdoor Natural Gas Water Heater 6.6 GPM
This Noritz outdoor tankless water heater runs on natural gas. It delivers a maximum flow rate of 6.6 GPM with a 140,000 Btuh heating capacity. The unit carries a 0.81 UEF rating and features a Low NOx design. It weighs 36 pounds and measures 26.6 by 17.6 by 10.7 inches. It suits you if you need moderate outdoor natural gas hot water delivery without indoor venting requirements.
Pros
- Max flow rate of 6.6 GPM
- 140,000 Btuh maximum heat input
- 0.81 UEF efficiency rating
- Low NOx emissions
- Outdoor installation requires no indoor exhaust flue
Cons
- Outdoor installation only
- Dedicated natural gas line required; no propane support
Good fit if
- You have an exterior mounting location available.
- You use natural gas for your utility fuel supply.
- You require up to 6.6 GPM of hot water capacity.
Skip if
- You need an indoor-mounted water heater.
- You run your utilities on liquid propane.
- You need flow rates higher than 6.6 GPM.
Verdict: Noritz Outdoor Natural Gas Water Heater 6.6 GPM delivers 140,000 Btuh outdoor heating with a 0.81 UEF rating. It serves moderate household demands without indoor venting hardware.
Noritz 9.8 GPM Natural Gas Tankless Water Heater
Best for: high-demand natural gas households
- Fuel Type
- Natural Gas
- Flow Rate
- 9.8 GPM
- Installation Location
- Indoor/Outdoor
- Dimensions
- 13.8 × 10.6 × 23.6 inches
- Weight
- 54 pounds
View on Amazon: Noritz 9.8 GPM Natural Gas Tankless Water Heater
This Noritz natural gas tankless water heater delivers flow rates up to 9.8 GPM for indoor or outdoor setups. It features a commercial-grade copper heat exchanger built with 25% thicker piping than standard models. The package includes a remote thermostat and a six-foot power cord. You can also link two units together with a quick-connect cord. This unit suits you if you need high-capacity domestic hot water from natural gas.
Pros
- Flow rate reaches up to 9.8 GPM
- Commercial-grade copper heat exchanger with 25% thicker piping
- Includes remote thermostat and 6-foot power cord
- Supports dual-unit linking via QC-2 Quick Connect Cord
Cons
- Runs strictly on natural gas with no liquid propane support
- Weighs 54 pounds, requiring sturdy wall support
Good fit if
- You have an existing natural gas supply line.
- You want flow rates up to 9.8 GPM for multiple fixtures.
- You plan to link two heaters for higher hot water volume.
Skip if
- You rely on liquid propane fuel.
- You need a lightweight unit under 50 pounds.
Verdict: Noritz 9.8 GPM Natural Gas Tankless Water Heater provides high flow and durable commercial-grade copper piping for natural gas homes. It offers flexible indoor or outdoor placement alongside dual-unit linking capability.
Noritz 7.5 GPM Outdoor Natural Gas Water Heater
Best for: high-demand outdoor natural gas installations
- Fuel Type
- Natural Gas
- Flow Rate
- 7.5 GPM
- BTU
- 199,000 BTU
- Installation Location
- Outdoor
View on Amazon: Noritz 7.5 GPM Outdoor Natural Gas Water Heater
This Noritz outdoor tankless water heater supplies 7.5 GPM using natural gas at up to 199,000 BTU. It features an outdoor-only design that requires no indoor venting. With an 84% thermal efficiency rating and an activation flow rate of 0.05 GPM, it delivers hot water even at low demand. This unit serves you well if you need high output without running interior exhaust ducts.
Pros
- High heating capacity of up to 199,000 BTU
- Flow rate up to 7.5 GPM
- Low 0.05 GPM activation flow rate
- Requires no venting for outdoor installation
- Includes self-diagnostic onboard computer system
Cons
- Outdoor installation only with no indoor mounting option
- Restricted to natural gas fuel
Good fit if
- You need high output up to 7.5 GPM and 199,000 BTU.
- You plan to mount the unit outside to avoid venting work.
- You use natural gas in your home.
Skip if
- You need an indoor installation.
- You require a liquid propane water heater.
Verdict: Noritz 7.5 GPM Outdoor Natural Gas Tankless Water Heater provides high capacity and 199,000 BTU without requiring interior venting. Its low 0.05 GPM activation threshold ensures reliable operation across varying hot water demands.
Noritz 9.8 GPM Propane Tankless Water Heater
Best for: high-demand liquid propane homes
- 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 tankless water heater runs on liquid propane and delivers up to 9.8 GPM of hot water with a maximum heat output of 180,000 BTU. It requires a standard 120-volt electrical connection to operate. If you need high-volume water heating for propane setups, this 65-pound unit fits larger hot water demands without using natural gas.
Pros
- High flow rate reaching up to 9.8 GPM
- Substantial heating output rated at 180,000 BTU
- Uses standard 120-volt electrical input
- Compact footprint measuring 24 by 9 by 8 inches
Cons
- Restricted to liquid propane fuel with no natural gas support
- Heavy unit weighing 65 pounds
Good fit if
- You use liquid propane instead of natural gas.
- You need high hot water delivery up to 9.8 GPM.
- You have an available 120-volt power connection.
Skip if
- You require a natural gas fuel source.
- You want a lightweight heater under 60 pounds.
Verdict: Noritz 9.8 GPM Propane Tankless Water Heater delivers 180,000 BTU performance and high output for propane-supplied residences. It offers high flow capacity within a 24-inch frame requiring 120-volt power.
Noritz Outdoor Natural Gas Tankless Heater, 5.0 GPM
Best for: Outdoor natural gas setups with moderate demand
- Fuel Type
- Natural Gas
- Flow Rate
- 5.0 GPM
- BTU
- 120,000 BTU/hr
- Installation Location
- Outdoor
- Dimensions
- 26.6 x 17.6 x 10.7 inches
- Weight
- 33 pounds
View on Amazon: Noritz Outdoor Natural Gas Tankless Heater, 5.0 GPM
This outdoor natural gas tankless water heater delivers up to 5.0 GPM with a maximum heating capacity of 120,000 BTU/hr. Designed strictly for outdoor mounting, it measures 26.6 inches high by 17.6 inches wide and weighs 33 pounds. It suits you if you run natural gas and need outdoor water heating for moderate demands without indoor venting components.
Pros
- Delivers flow rate up to 5.0 GPM
- Outdoor installation requires no indoor exhaust venting
- Features Low NOx performance
- Lightweight build at 33 pounds
Cons
- Restricted to outdoor installation only
- Heating capacity capped at 120,000 BTU/hr
- Incompatible with liquid propane fuel
Good fit if
- You have dedicated outdoor wall mounting space.
- You use a natural gas line for your water heater.
- You need up to 5.0 GPM of flow capacity.
Skip if
- You require an indoor installation setup.
- You need liquid propane instead of natural gas.
- You need more than 120,000 BTU/hr for peak water demands.
Verdict: Noritz Outdoor Natural Gas Tankless Heater, 5.0 GPM delivers reliable exterior heating with 120,000 BTU/hr capacity for moderate household flow needs. It provides a compact low-NOx outdoor setup without requiring indoor vent pathways.
Noritz 6.6 GPM Outdoor Liquid Propane Tankless Heater
Best for: outdoor liquid propane water heating setups
- Fuel Type
- Liquid Propane
- Flow Rate
- 6.6 Gpm
- BTU
- 140,000 Btuh
- Installation Location
- Outdoor
- Dimensions
- 26.6 x 17.6 x 10.7 inches
- Weight
- 36 pounds
View on Amazon: Noritz 6.6 GPM Outdoor Liquid Propane Tankless Heater
This outdoor tankless water heater runs on liquid propane and delivers up to 6.6 GPM. Its burner generates up to 140,000 BTUs to heat water on demand without an indoor footprint. At 36 pounds and measuring 26.6 by 17.6 by 10.7 inches, it mounts externally to save interior space. It suits you if you need a dedicated exterior propane water heater.
Pros
- Delivers up to 6.6 GPM flow rate
- Burner outputs up to 140,000 BTUs
- Low NOx emissions
- Compact 36-pound exterior design
Cons
- Outdoor installation only
- Requires liquid propane supply
- Listed with no exterior finish
Good fit if
- You have a dedicated outdoor installation space.
- You run your utilities on liquid propane.
- You need a continuous supply up to 6.6 GPM.
Skip if
- You require an indoor water heater.
- You use natural gas rather than liquid propane.
Verdict: Noritz 6.6 GPM Outdoor Liquid Propane Tankless Heater provides 140,000 BTUs of heating capacity for outdoor spaces. It delivers up to 6.6 GPM using a dedicated propane fuel supply.
Noritz 6.6 GPM Indoor Natural Gas Tankless Heater
Best for: indoor natural gas setups needing 6.6 GPM
- Fuel Type
- Natural Gas
- Flow Rate
- 6.6 GPM
- Installation Location
- Indoor
- Venting Type
- Condensing
- Dimensions
- 6.7 × 13.8 × 23.6 inches
- Weight
- 38 pounds
View on Amazon: Noritz 6.6 GPM Indoor Natural Gas Tankless Heater
This Noritz indoor condensing water heater runs on natural gas and delivers a flow rate of up to 6.6 GPM. Because it is a condensing model, you can vent it using standard Schedule 40 PVC pipe and fittings inside your home. It includes a remote thermostat and a six-foot power cord in the box. This unit fits households that need reliable indoor natural gas water heating without outdoor mounting.
Pros
- 6.6 GPM flow rate
- Vents with Schedule 40 PVC pipe and fittings
- Includes remote thermostat and 6-foot power cord
- Condensing operation with Low NOx emissions
Cons
- Indoor installation only
- Runs on natural gas only with no propane support
Good fit if
- You need an indoor natural gas tankless water heater.
- You want to vent using Schedule 40 PVC pipe.
- You require up to 6.6 GPM of hot water.
Skip if
- You need an outdoor water heater.
- You use liquid propane instead of natural gas.
- You require a flow rate greater than 6.6 GPM.
Verdict: Noritz 6.6 GPM Indoor Condensing Water Heater provides indoor natural gas heating with Schedule 40 PVC venting compatibility. It works well if you want a 6.6 GPM flow rate and included remote controls.
Specifications side by side
| Spec | Noritz EZ Series Pro 11.1 GPM Natural Gas Heater | Noritz Outdoor Propane Tankless Water Heater | Noritz Outdoor Natural Gas Water Heater 6.6 GPM | Noritz 9.8 GPM Natural Gas Tankless Water Heater | Noritz 7.5 GPM Outdoor Natural Gas Water Heater | Noritz 9.8 GPM Propane Tankless Water Heater | Noritz Outdoor Natural Gas Tankless Heater, 5.0 GPM | Noritz 6.6 GPM Outdoor Liquid Propane Tankless Heater | Noritz 6.6 GPM Indoor Natural Gas Tankless Heater |
|---|---|---|---|---|---|---|---|---|---|
| Fuel Type | Natural Gas | Liquid Propane | Natural Gas | Natural Gas | Natural Gas | Liquid Propane | Natural Gas | Liquid Propane | Natural Gas |
| Flow Rate | 11.1 GPM | 5.0 Gpm | 6.6 Gpm | 9.8 GPM | 7.5 GPM | 9.8 GPM | 5.0 GPM | 6.6 Gpm | 6.6 GPM |
| BTU | 199,900 BTU | 120,000 Btuh | 140,000 Btuh | not specified | 199,000 BTU | 180000 BTU | 120,000 BTU/hr | 140,000 Btuh | not specified |
| Installation Location | Indoor/Outdoor | Outdoor | Outdoor | Indoor/Outdoor | Outdoor | not specified | Outdoor | Outdoor | Indoor |
| Voltage | 120 V | not specified | not specified | not specified | not specified | 120 Volt | not specified | not specified | not specified |
| Dimensions | 11.8 x 18.1 x 26.1 in | 26.6 x 17.6 x 10.7 inches | 26.6 x 17.6 x 10.7 inches | not specified | not specified | not specified | 26.6 x 17.6 x 10.7 inches | 26.6 x 17.6 x 10.7 inches | not specified |
| Venting Type | not specified | not specified | not specified | not specified | not specified | not specified | not specified | not specified | Condensing |
| Weight | 77.2 pounds | 33 pounds | 36 pounds | 54 pounds | not specified | 65 pounds | 33 pounds | 36 pounds | 38 pounds |
| Color | Silver | Liquid Propane | No Finish | Beige | Beige | Liquid Propane | White | No Finish | White |
| Model | GQ-C3261WX-FF US NG | NR501-OD-LP | NR662-OD-NG | NR98SVNG | NR98-OD NG | NRC98-DV-LP | NR501-OD-NG | NR662-OD-LP | NRC661-DV-NG |
| Size | not specified | not specified | not specified | 9.375 inches | 7.5 GPM | not_applicable | 17.6 inches (W) x 26.6 inches (H) | not specified | 13.8 inches (W) x 23.6 inches (H) x 10 inches (D) |
Noritz Tankless Water Heater Models
Noritz offers units for natural gas and propane. The top pick, the Noritz EZ Series Pro 11.1 GPM Natural Gas Heater, delivers 11.1 GPM flow for high-demand homes. It weighs 77.2 pounds and suits outdoor or indoor wall mounting. The Noritz 9.8 GPM Natural Gas Tankless Water Heater also supports linking multiple units for greater capacity.
For propane users, the Noritz Outdoor Propane Tankless Water Heater provides 5.0 GPM in a compact 33-pound cabinet. The Noritz 9.8 GPM Propane Tankless Water Heater offers higher output for demanding setups. Indoor shoppers can choose the Noritz 6.6 GPM Indoor Natural Gas Tankless Heater, which uses condensing venting and includes remote controls. These options cover various flow rates and installation needs.
Where Noritz Fits Your Home
Noritz covers a wide flow range from 5.0 GPM to 11.1 GPM. Most units are outdoor-ready, with propane and natural gas options. You can choose between compact outdoor cabinets or larger indoor condensing models that use PVC venting. The brand offers flexible placement for most setups, including dual-unit linking for higher capacity. However, the lineup lacks dedicated propane outdoor models under 6.6 GPM. You also will not find electric units here. If you need indoor propane or electric heating, Noritz does not currently offer those specific configurations in this selection.
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How to choose the right one
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Match fuel to supply
You must select a unit that matches your existing gas line. Noritz offers distinct models for natural gas and liquid propane. The Noritz EZ Series Pro 11.1 GPM uses natural gas, while the NR501-OD-LP is built strictly for propane. Using the wrong fuel type can damage the internal components or prevent ignition entirely. Check your utility connection before purchasing. Do not assume a unit is versatile across both fuel sources unless the specifications explicitly state dual-fuel capability. Always verify the fuel type attribute in the product data.
-
Plan for outdoor placement
Most Noritz units are designed for exterior wall mounting. The NR662-OD-NG and NR501-OD-LP are outdoor-specific models. These units withstand weather elements but require adequate clearance. If you need indoor installation, look for condensing models like the NRC661-DV-NG. Indoor units require specific venting paths and often include remote controls. Outdoor units are lighter and simpler to install but expose components to the elements. Choose outdoor placement if you have exterior wall space. Select indoor placement if you need to hide the unit or protect it from harsh climates.
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Calculate total flow needs
Flow rate determines how many fixtures can run simultaneously. The Noritz EZ Series Pro delivers 11.1 GPM for high-demand homes. Smaller units like the NR501-OD-NG provide 5.0 GPM. This is suitable for single-bathroom setups or moderate demand. If you run two showers and a kitchen sink, you need higher GPM ratings. Check the flow rate attribute carefully. Do not guess your household usage. Measure your peak demand to ensure the unit keeps water warm during simultaneous use. Higher GPM units generally cost more in gas consumption.
-
Check venting requirements
Venting type varies significantly between indoor and outdoor models. Indoor condensing units, such as the NRC661-DV-NG, use Schedule 40 PVC venting. This allows flexible installation near living spaces. Outdoor units typically use stainless steel venting or direct vent systems. They do not require interior vent pathways. Verify the venting type in the specifications. Incorrect venting can cause safety hazards and efficiency loss. Indoor units often have higher efficiency ratings due to condensing technology. Outdoor units are simpler but may have lower UEF ratings. Match the venting to your home structure.
-
Verify power and voltage
Tankless heaters require electrical power for controls and ignition. The NRC98-DV-LP requires 120-volt power for its electronic components. Ensure you have a nearby outlet or plan for wiring. Most units need a standard circuit. Check the voltage requirements in the specs. Some models may have different power needs. Do not assume all units plug into standard outlets. Verify the electrical setup before installation. Proper voltage ensures reliable operation and prevents error codes. If your electrical system is outdated, you may need an upgrade to support the heater's power demands.
Frequently asked questions
Which Noritz tankless water heater is best for high-demand natural gas homes?
The Noritz EZ Series Pro 11.1 GPM Natural Gas Heater is the top choice. It delivers 11.1 GPM flow and 199,900 BTU output. This unit suits demanding natural gas setups. It weighs 77.2 pounds and fits outdoor or indoor wall mounting. The model number is GQ-C3261WX-FF US NG.
What is the best budget Noritz tankless water heater?
The Noritz Outdoor Propane Tankless Water Heater serves as the best budget option. It provides 5.0 GPM flow and 120,000 Btuh. The unit weighs only 33 pounds. It is built strictly for outdoor liquid propane installations. The model number is NR501-OD-LP.
Are there Noritz tankless water heaters suitable for indoor installation?
Yes, the Noritz 6.6 GPM Indoor Natural Gas Tankless Heater is designed for indoor use. It uses condensing technology and supports Schedule 40 PVC venting. The unit weighs 38 pounds and includes remote controls. It fits in compact spaces with dimensions of 13.8 inches wide by 23.6 inches high.
Which Noritz model offers the highest flow rate?
The Noritz EZ Series Pro 11.1 GPM Natural Gas Heater offers the highest flow rate at 11.1 GPM. It also provides 199,900 BTU of heating power. This makes it ideal for homes with multiple simultaneous hot water needs. The unit is silver and measures 18.1 inches wide.
Can Noritz tankless water heaters be linked together?
Yes, the Noritz 9.8 GPM Natural Gas Tankless Water Heater allows dual-unit linking. This feature provides high flow for large households. The unit uses durable commercial-grade copper piping. It weighs 54 pounds and measures 10.6 inches wide by 23.6 inches high. The model number is NR98SVNG.
What is the lowest flow activation threshold among Noritz models?
The Noritz 7.5 GPM Outdoor Natural Gas Tankless Water Heater has a low 0.05 GPM activation threshold. This ensures reliable operation even with varying hot water demands. It delivers 199,000 BTU without requiring interior venting. The beige unit is designed for outdoor natural gas installations.
Which Noritz heater is best for outdoor propane setups?
The Noritz 9.8 GPM Propane Tankless Water Heater is ideal for high-demand propane homes. It delivers 180,000 BTU performance. The unit requires 120-volt power and weighs 65 pounds. It measures 8 inches wide by 24 inches long. The model number is NRC98-DV-LP.