6 Best Alternatives to the Rheem RTG Series 9.5 GPM Natural Gas Tankless Water Heater (2026)
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The Rheem RTG Series 9.5 GPM Natural Gas Tankless Water Heater delivers high-volume hot water for large households. Its 9.5 GPM flow rate and 199,900 BTU output support three to four simultaneous showers. The unit features WiFi connectivity and indoor installation options for modern homes.
You might need a different model if your home requires outdoor mounting or propane fuel. Some buyers prefer smaller footprints or lower flow rates for compact spaces. This list includes alternatives chosen because their specifications overlap with the original. These options cover various fuel types, venting styles, and flow capacities. Each product meets specific needs that the base model may not address. You can compare dimensions and efficiency ratings to find the right fit for your layout.
Our top pick: Rheem RTG 9.5 GPM Natural Gas Water Heater.
How these alternatives compare
Rheem RTG 9.5 GPM Outdoor Natural Gas Tankless Heater
This model shares the 9.5 GPM flow rate and natural gas fuel type but is designed for outdoor installation. It lacks WiFi connectivity, offering a simpler control interface. The unit is slightly shorter and lighter than the indoor RTG version, measuring 20.8 inches in height and weighing 39.3 pounds. You save space and avoid venting requirements if you mount it outside. Choose this if you have an exterior wall available and do not need smart home integration. It provides the same high-volume hot water for large families but in a weather-resistant package.
Rheem RTGH Series 9.5 GPM Indoor Natural Gas
The RTGH Series also delivers 9.5 GPM of hot water using natural gas but features a stainless steel heat exchanger for durability. It is larger and heavier, weighing 59.9 pounds and measuring 17.7 inches wide. This unit includes WiFi connectivity for remote monitoring and control. It is built for indoor installation with direct venting. Select this if you want a premium build quality and smart features. The wider footprint requires more wall space. It offers the same high flow rate as the original but with a more robust internal construction and enhanced connectivity options.
Rinnai RE180iN 6.9 GPM Natural Gas
The Rinnai RE180iN has a lower flow rate of 5.0 GPM according to attributes, though specs list 8.5 GPM. It is designed for smaller households or limited spaces. The unit is taller at 27.3 inches but narrower at 14.1 inches. It weighs 54 pounds. This model is suitable for homes with moderate hot water demands. It lacks the high output needed for three to four simultaneous showers. Choose this if you need a compact indoor solution for a smaller family. It trades flow capacity for a different form factor and potentially lower gas consumption.
Westinghouse 10.3 GPM Natural Gas Tankless Heater
The Westinghouse unit offers a higher flow rate of 10.3 GPM with 199,000 BTU output. It includes WiFi connectivity for app control. The dimensions listed are minimal, but it weighs 56 pounds. This model is ideal for large households needing maximum simultaneous hot water. It matches the BTU output of the original but pushes more water. Select this if you require higher flow for multiple bathrooms. It provides smart features and robust performance. The higher GPM ensures consistent pressure during peak usage times. It is a strong alternative for homes with high water demand.
Rheem RTG 9.5 GPM Outdoor Propane Tankless Water Heater
This Rheem model uses propane instead of natural gas but maintains the 9.5 GPM flow rate. It is designed for outdoor installation and includes WiFi connectivity. The unit measures 20.8 inches in height and weighs 40.5 pounds. It is similar in size to the outdoor natural gas version. Choose this if you have a propane supply and need an outdoor unit. It offers the same high-volume hot water delivery. The propane fuel type requires a different connection setup. It is a suitable alternative for homes with existing propane infrastructure and outdoor mounting space.
VancEpic 4.8 GPM Natural Gas Tankless Heater
The VancEpic heater has a significantly lower flow rate of 4.8 GPM and 110,000 BTU output. It is lighter at 25.4 pounds and measures 24.6 inches in height. This unit is best for small households or specific fixture clusters. It lacks the high capacity needed for whole-house simultaneous use. Select this if you need a compact solution for a bathroom or kitchen only. It provides precise temperature control for limited hot water needs. It is not suitable for large families requiring multiple showers at once. It offers a smaller footprint and lower energy consumption.
Quick picks
Our 7 picks
Rheem RTG 9.5 GPM Natural Gas Water Heater
Best for: large indoor homes needing high flow
- Fuel Type
- Natural Gas
- Flow Rate
- 9.5 GPM
- BTU
- 199,900 BTU/hr
- Installation Location
- Indoor
- Temperature Control
- ±1°F
- Certification
- CSA
View on Amazon: Rheem RTG 9.5 GPM Natural Gas Water Heater Affiliate link
This indoor Rheem tankless heater delivers 9.5 GPM at a 35°F rise, powered by 199,900 BTUs. It features a 0.82 UEF rating for efficiency and includes WiFi connectivity for remote control. The unit measures 24.2 x 13.5 x 10.3 inches and weighs 46.5 pounds. Its ±1°F temperature precision ensures consistent output. This model suits large homes needing simultaneous hot water for multiple fixtures.
Pros
- 9.5 GPM flow rate supports 3-4 showers
- WiFi enabled for digital control
- 0.82 Uniform Energy Factor rating
- ±1°F temperature precision
Cons
- Indoor installation only
- Non-condensing venting requires specific clearance
- Heavier build at 46.5 pounds
Good fit if
- You need high flow for whole-house use
- You want remote control via WiFi
- You are replacing a tank heater indoors
Skip if
- You require outdoor installation
- You need liquid propane fuel
- You want a compact unit under 10 pounds
Verdict: Rheem RTG 9.5 GPM Natural Gas fits large households requiring reliable, high-volume hot water with smart connectivity. Its indoor design and WiFi features make it a strong option for modern retrofit projects.
Rheem RTG 9.5 GPM Outdoor Natural Gas Tankless Heater
Best for: outdoor whole-house hot water needs
- 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 Affiliate link
This outdoor unit delivers 9.5 GPM at a 35°F rise, powered by 199,900 BTU/hr of natural gas. Its non-condensing design eliminates venting needs, while the digital LED panel offers ±1°F precision. The durable metal cabinet and built-in freeze protection suit whole-house use for 3-4 simultaneous showers. It provides endless hot water without the bulk of a tank, making it a solid choice for outdoor installation.
Pros
- 9.5 GPM flow rate supports 3-4 simultaneous showers
- 199,900 BTU/hr output for high performance
- Digital LED control with ±1°F precision
- Non-condensing design requires no venting
Cons
- Requires outdoor installation only
- No WiFi connectivity in this specific model
- Professional installation is mandatory
Good fit if
- You need a whole-house solution for 3-4 bathrooms
- You have an outdoor space for mounting
- You want precise temperature control without venting
Skip if
- You require indoor installation
- You want smart home integration via WiFi
- You prefer a compact unit under 10 inches wide
Verdict: Rheem RTG Series 9.5 GPM Outdoor Natural Gas Heater delivers reliable high-volume hot water for large households. It fits buyers who can mount it outside and need precise, vent-free operation.
Rheem RTGH Series 9.5 GPM Indoor Natural Gas
Best for: indoor whole-house hot water needs
- Fuel Type
- Natural Gas
- Flow Rate
- 9.5 GPM at 35°F rise
- BTU
- 199,900 BTU/hr
- Installation Location
- Indoor
- Voltage
- 120 V
- Temperature Control
- Digital LED, ±1°F
View on Amazon: Rheem RTGH Series 9.5 GPM Indoor Natural Gas Affiliate link
This indoor natural gas unit delivers 9.5 GPM at a 35°F rise, powered by 199,900 BTU/hr. It features condensing technology for a 0.93 UEF and digital LED control with ±1°F precision. The compact design fits homes needing whole-house hot water for 3-4 simultaneous showers. It includes built-in freeze protection and ultra-low NOx compliance for efficient, safe indoor operation.
Pros
- 9.5 GPM flow rate at 35°F rise
- 199,900 BTU/hr heating capacity
- 0.93 Uniform Energy Factor (UEF)
- Digital LED control with ±1°F precision
- Built-in freeze protection
Cons
- Indoor installation only
- Heavier at 59.9 pounds
- No WiFi connectivity on this specific model
Good fit if
- You need whole-house hot water for multiple bathrooms
- You want high efficiency with a 0.93 UEF
- You prefer precise digital temperature control
Skip if
- You require outdoor installation
- You need WiFi smart home integration
- You have limited space for a 59.9 lb unit
Verdict: Rheem RTGH Series 9.5 GPM Indoor Natural Gas offers high efficiency and precise control for large families. It is best for indoor installations requiring reliable, high-volume hot water delivery.
Rinnai RE180iN 6.9 GPM Natural Gas
Best for: small indoor spaces with moderate hot water needs
- Fuel Type
- Natural Gas
- Flow Rate
- 8.5 GPM
- BTU
- 180k BTU
- Installation Location
- Indoor
- Dimensions
- 27.3 x 14.1 x 10.8 in
- Venting Type
- Non-Condensing
View on Amazon: Rinnai RE180iN 6.9 GPM Natural Gas Affiliate link
The Rinnai RE180iN is a compact, non-condensing indoor tankless water heater powered by natural gas. It delivers 6.9 GPM, supporting up to five simultaneous fixtures. The unit measures 27.3 x 14.1 x 10.8 inches and weighs 54 pounds. It features an LED screen for error codes and service reminders. This model suits households with moderate hot water needs that prioritize a smaller footprint and reliable indoor performance.
Pros
- 6.9 GPM flow rate supports five fixtures
- Compact indoor design fits tight spaces
- LED screen displays error codes and reminders
- 15-year heat exchanger warranty
Cons
- Lower flow rate than the 9.5 GPM Rheem RTG Series
- WiFi control requires a separate Controlr module
- Indoor installation only, not suitable for outdoor use
Good fit if
- You need a compact unit for a small utility closet
- You have moderate simultaneous hot water demands
- You prefer a non-condensing indoor natural gas heater
Skip if
- You require a flow rate above 7 GPM
- You need an outdoor-rated water heater
- You want built-in WiFi connectivity without extra parts
Verdict: Rinnai RE180iN 6.9 GPM Natural Gas is a solid choice for small households with limited space who need reliable indoor heating without the bulk of larger models.
Westinghouse 10.3 GPM Natural Gas Tankless Heater
Best for: large households with indoor venting
- Fuel Type
- Natural Gas
- Flow Rate
- 10.3 GPM
- BTU
- 199,000 BTU/hr
- Installation Location
- Indoor
- Temperature Control
- WiFi & APP control
- Venting Type
- Non-Condensing
View on Amazon: Westinghouse 10.3 GPM Natural Gas Tankless Heater Affiliate link
This indoor natural gas unit delivers 10.3 GPM at 199,000 BTU. It supports up to seven fixtures simultaneously. You can adjust settings via WiFi and app control. The non-condensing design requires specific venting. It weighs 56 pounds. This model suits large households needing high flow rates and remote management capabilities.
Pros
- 10.3 GPM flow rate for multiple fixtures
- 199,000 BTU heating capacity
- WiFi and app control for remote adjustments
- Indoor installation capability
Cons
- Non-condensing design limits efficiency compared to condensing models
- No remote control included in specifications
- Heavier build at 56 pounds
Good fit if
- You need hot water for seven fixtures
- You want app-based temperature control
- You have indoor venting options
Skip if
- You prefer condensing efficiency
- You need outdoor installation
- You want a remote control
Verdict: Westinghouse 10.3 GPM Natural Gas Heater provides high flow and app control for large homes. It fits buyers who need simultaneous hot water for multiple fixtures.
Rheem RTG 9.5 GPM Outdoor Propane Tankless Water Heater
Best for: outdoor propane homes needing high flow
- 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 Affiliate link
This is a 9.5 GPM liquid propane tankless water heater designed for outdoor use. It delivers 199,900 BTUs with a non-condensing design. The unit features WiFi connectivity and precise digital temperature control with ±1°F adjustments. It includes built-in freeze and flame failure protection. This model suits large homes needing high flow rates for multiple simultaneous showers.
Pros
- 9.5 GPM flow rate supports 3-4 simultaneous showers
- WiFi enabled for remote monitoring
- Precise ±1°F digital temperature control
- Built-in freeze protection
- 15-year heat exchanger warranty
Cons
- Outdoor installation only
- Requires professional installation
- Non-condensing efficiency lower than condensing models
Good fit if
- You need a high-flow propane unit
- You have outdoor space for mounting
- You want WiFi connectivity
Skip if
- You require indoor installation
- You use natural gas instead of propane
- You prefer a condensing unit for higher efficiency
Verdict: Rheem RTG Series 9.5 GPM Propane is a robust outdoor solution for large households requiring high flow rates. It fits buyers who need propane fuel, outdoor mounting, and smart connectivity features.
VancEpic 4.8 GPM Natural Gas Tankless Heater
Best for: small households needing precise indoor hot water
- Fuel Type
- Natural Gas
- Flow Rate
- 4.8 GPM
- BTU
- 110,000 BTU
- Installation Location
- Indoor
- Temperature Control
- ±1°F
- Dimensions
- 24.6 x 14.4 x 14.4 in
View on Amazon: VancEpic 4.8 GPM Natural Gas Tankless Heater Affiliate link
This VancEpic unit delivers 4.8 GPM at 110,000 BTU for indoor natural gas use. It features an oxygen-free copper heat exchanger and maintains temperature within ±1°F. The compact 24.6-inch height suits tight spaces. It includes four preset modes and child lock safety. This model supports 3-5 outlets, making it suitable for smaller households or specific fixture clusters.
Pros
- 4.8 GPM flow rate for multiple outlets
- ±1°F precise temperature control
- Oxygen-free copper heat exchanger
- Compact 24.6 x 14.4 x 14.4 inch size
Cons
- Lower 4.8 GPM flow rate compared to 9.5 GPM competitors
- Shorter 2-year warranty standard
- Limited to indoor installation only
Good fit if
- You need hot water for 3-5 specific outlets
- You have limited vertical space for installation
- You prefer precise temperature stability
Skip if
- You require high flow for whole-house simultaneous use
- You need an outdoor-rated unit
- You want a longer standard warranty
Verdict: VancEpic 4.8 GPM Natural Gas Heater is a compact, precise solution for smaller homes or specific fixture clusters, though it lacks the high flow of larger competitors.
Specifications side by side
| Spec | Rheem RTG 9.5 GPM Natural Gas Water Heater | Rheem RTG 9.5 GPM Outdoor Natural Gas Tankless Heater | Rheem RTGH Series 9.5 GPM Indoor Natural Gas | Rinnai RE180iN 6.9 GPM Natural Gas | Westinghouse 10.3 GPM Natural Gas Tankless Heater | Rheem RTG 9.5 GPM Outdoor Propane Tankless Water Heater | VancEpic 4.8 GPM Natural Gas Tankless Heater |
|---|---|---|---|---|---|---|---|
| Fuel Type | Natural Gas | Natural Gas | Natural Gas | Natural Gas | Natural Gas | Liquid Propane | Natural Gas |
| Flow Rate | 9.5 GPM | 9.5 GPM | 9.5 GPM at 35°F rise | 8.5 GPM | 10.3 GPM | 9.5 GPM | 4.8 GPM |
| BTU | 199,900 BTU/hr | 199,900 BTU/hr | 199,900 BTU/hr | 180k BTU | 199,000 BTU/hr | 199,900 BTU/hr | 110,000 BTU |
| Installation Location | Indoor | Outdoor | Indoor | Indoor | Indoor | Outdoor | Indoor |
| Voltage | not stated | not stated | 120 V | not stated | not stated | not stated | not stated |
| Temperature Control | ±1°F | ±1°F | Digital LED, ±1°F | not stated | WiFi & APP control | ±1°F | ±1°F |
| Certification | CSA | CSA | CSA | not stated | not stated | CSA | not stated |
| Dimensions | 24.2 x 13.5 x 10.3 inches | 20.8 x 13.5 x 9.4 inches | 23.7 x 17.7 x 9.8 inches | 27.3 x 14.1 x 10.8 in | not stated | 20.8 x 13.5 x 9.4 inches | 24.6 x 14.4 x 14.4 in |
| Venting Type | Non-Condensing | Non-Condensing | not stated | Non-Condensing | Non-Condensing | Non-Condensing | Non-Condensing |
| Features | WiFi | WiFi | WiFi | not stated | WiFi | WiFi | not stated |
| Material | not stated | not stated | Stainless Steel | not stated | not stated | not stated | not stated |
| Weight | 46.5 pounds | 39.3 pounds | 59.9 pounds | 54 pounds | 56 pounds | 40.5 pounds | 25.4 pounds |
| Size | 9.5 GPM (WiFi) | 9.5 GPM (No WiFi) | 9.5 GPM (No WiFi) | 8.5 GPM | not stated | 9.5 GPM (WiFi) | 4.8GPM, 110,000BTU, NG |
| Color | Gray | Gray | Gray | Silver | White | Gray | Non-Condensing |
| Model | RTG-95DVELN-3 | RTG-95XLN-3 | RTGH-95DVLN-3 | REU-VE2432FFD-US-N | not stated | RTG-95XELP-3 | VH11K-W-NG-U01 |
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Frequently asked questions
Can I install the Rheem RTG Series 9.5 GPM Natural Gas unit outdoors?
No, the standard Rheem RTG Series 9.5 GPM Natural Gas model is designed for indoor installation only. It requires non-condensing venting and is not weatherproof. If you need an outdoor unit, consider the Rheem RTG Series 9.5 GPM Outdoor Natural Gas Tankless Heater, which is built for exterior mounting and lacks WiFi connectivity.
Does the Rheem RTG 9.5 GPM Natural Gas heater include WiFi?
Yes, the Rheem RTG 9.5 GPM Natural Gas Water Heater includes WiFi connectivity. This feature allows you to monitor and control the unit remotely via a mobile app. The indoor model, identified by model number RTG-95DVELN-3, supports smart home integration for convenient temperature adjustments and system status checks.
What is the difference between the Rheem RTG and RTGH Series 9.5 GPM models?
The primary difference lies in construction and efficiency. The RTGH Series 9.5 GPM Indoor Natural Gas model features a stainless steel heat exchanger, which typically offers higher durability and efficiency. The standard RTG Series uses a copper heat exchanger. Both models provide 9.5 GPM flow, but the RTGH is heavier and slightly wider.
How does the Westinghouse 10.3 GPM compare to the Rheem RTG 9.5 GPM?
The Westinghouse 10.3 GPM Natural Gas Tankless Heater offers a higher flow rate of 10.3 GPM compared to the Rheem RTG’s 9.5 GPM. It also boasts a 199,000 BTU output, which is comparable to the Rheem’s 199,900 BTU. Both units support indoor installation and WiFi features, making them suitable for large households needing simultaneous hot water.
Is there a propane version of the Rheem RTG 9.5 GPM?
Yes, the Rheem RTG Series 9.5 GPM Outdoor Propane Tankless Water Heater is available. It shares the same 9.5 GPM flow rate and WiFi connectivity as the natural gas indoor model but is designed for outdoor use and runs on propane. This unit is ideal for homes with propane fuel lines and exterior mounting space.
What are the dimensions of the Rheem RTG 9.5 GPM Natural Gas unit?
The Rheem RTG 9.5 GPM Natural Gas Water Heater measures 13.5 inches in width, 24.2 inches in height, and 10.3 inches in length. It weighs 46.5 pounds. These compact dimensions allow for flexible indoor placement, such as in a utility closet or garage, while providing high-volume hot water for large households.
Can I use the Rinnai RE180iN as a direct replacement for the Rheem RTG 9.5 GPM?
The Rinnai RE180iN 6.9 GPM Natural Gas is not a direct replacement if you need high flow. It delivers 5.0 GPM according to its attributes, which is significantly lower than the Rheem RTG’s 9.5 GPM. It is better suited for small households with moderate hot water needs and limited indoor space, rather than large families.