Rheem RTG 9.5 GPM Outdoor Alternatives: 6 Similar Picks Compared
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The Rheem RTG 9.5 GPM Outdoor Natural Gas Tankless Heater delivers 199,900 BTUs of output and a 9.5 GPM flow rate for whole-house use. If you are comparing rheem rtg 9 5 gpm outdoor alternatives, you may want different specs or features. This model uses natural gas, mounts outdoors, and includes WiFi connectivity in some versions. Its non-condensing design eliminates complex venting for exterior installation. You might seek a different fuel type, such as propane, or prefer indoor placement to save exterior wall space. Some buyers may also want a more compact unit or a condensing model for higher efficiency. We selected these 6 options because their published specifications overlap with the original unit. Each alternative shares key traits like similar flow rates or natural gas compatibility. You can compare their dimensions, BTU output, and installation requirements to find the best fit for your home. This guide focuses on practical differences in size, efficiency, and fuel type to help you decide.
How these alternatives differ from the RTG 9.5
Rheem RTG 9.5 GPM Natural Gas Water Heater
This Rheem model shares the 9.5 GPM flow rate and natural gas fuel type, but it is designed for indoor installation rather than outdoor mounting. You trade outdoor convenience for WiFi connectivity, which the outdoor version lacks in its base configuration. The unit is taller at 24.2 inches and slightly deeper, requiring more wall space. It uses non-condensing venting like the outdoor unit. If you have an indoor utility space and want smart home integration, this indoor variant offers a similar performance profile with added connectivity features for remote monitoring and control.
Rheem RTG 9.5 GPM Outdoor Propane Tankless Water Heater
The propane version of the RTG series maintains the 9.5 GPM flow rate and outdoor installation design, matching the original’s physical footprint of 20.8 inches in height. It differs primarily in fuel type, switching from natural gas to propane. This model includes WiFi features, whereas the base outdoor unit does not. The weight is slightly higher at 40.5 pounds compared to the 39.3-pound natural gas unit. If your home uses propane instead of natural gas, this unit provides the same high-flow capacity and outdoor durability without requiring changes to your mounting setup or venting requirements.
Rheem RTGH Series 9.5 GPM Indoor Natural Gas
This indoor natural gas unit offers the same 9.5 GPM flow rate but prioritizes efficiency and build quality. It features a stainless steel heat exchanger and is designed for indoor use with non-condensing venting. The unit is wider at 17.7 inches and heavier at 59.9 pounds, making it bulkier than the compact outdoor model. It includes WiFi connectivity for remote adjustments. If you need high-efficiency whole-house heating indoors and value durable materials over outdoor flexibility, this premium option provides precise temperature control and energy savings suitable for large families with multiple bathrooms.
Rinnai 7.6 GPM Outdoor Natural Gas Water Heater
The Rinnai model offers a 9.8 GPM flow rate, slightly higher than the 9.5 GPM Rheem unit, while maintaining an outdoor natural gas design. It is taller at 24.6 inches and weighs 53.3 pounds, making it a heavier and larger installation. The unit uses non-condensing venting and features a silver finish. If you prioritize maximum flow rate and compact outdoor durability in a reputable brand, this model provides a robust alternative. It suits buyers who need slightly higher capacity for simultaneous showers and prefer a stainless-steel cabinet for outdoor weather resistance.
Westinghouse 10.3 GPM Natural Gas Tankless Heater
This Westinghouse unit delivers a 10.3 GPM flow rate, exceeding the 9.5 GPM output of the Rheem outdoor model. It is designed for indoor installation only and uses natural gas with non-condensing venting. The unit includes WiFi features for app control, offering smart home integration that the base outdoor Rheem lacks. It generates 199,000 BTUs of heat. If you need the highest possible flow rate for indoor whole-house use and want remote management capabilities, this model provides superior capacity and connectivity, though it is not suitable for outdoor mounting.
Takagi Outdoor 8 GPM Natural Gas Water Heater
The Takagi unit is an outdoor condensing heater with an 8 GPM flow rate, lower than the 9.5 GPM Rheem model. It uses natural gas and features a condensing venting system, which improves efficiency but reduces flow capacity. The unit is taller at 24.9 inches and wider at 17.8 inches. It is designed for areas with strict low-NOx emission regulations. If you live in a region with tight air quality rules and can accept a slightly lower flow rate, this condensing model offers high efficiency and compliance with environmental standards while maintaining outdoor installation flexibility.
Quick picks
Our 7 picks
Rheem RTG 9.5 GPM Outdoor Natural Gas Tankless Heater
Best for: Whole-house outdoor natural gas 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 Affiliate link
The Rheem RTG-95XLN-3 is a 9.5 GPM natural gas tankless water heater designed for outdoor installation. It delivers 199,900 BTUs of heating power with a 0.82 UEF. The unit features a digital LED panel with ±1°F precision. It includes built-in freeze protection and flame failure safety. This model suits whole-house needs for 3-4 simultaneous showers without requiring indoor venting.
Pros
- 9.5 GPM flow rate supports multiple showers
- Outdoor installation eliminates complex venting requirements
- Digital LED control with ±1°F temperature precision
- Built-in freeze protection for cold climates
Cons
- Non-condensing design has lower efficiency than condensing models
- No WiFi connectivity in this specific 9.5 GPM variant
- Requires professional installation for gas line connection
Good fit if
- You need a high-flow unit for whole-house use
- You have an exterior wall for outdoor mounting
- You want precise digital temperature control
Skip if
- You require indoor installation only
- You need smart home integration via WiFi
- You prefer condensing high-efficiency technology
Verdict: Rheem RTG 9.5 GPM Outdoor Natural Gas is a robust outdoor solution for large households needing reliable hot water. It fits buyers who prioritize flow rate and outdoor convenience over smart features.
Rheem RTG 9.5 GPM Natural Gas Water Heater
Best for: indoor whole-house hot water demand
- 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 Rheem model delivers 9.5 GPM at a 35°F rise using 199,900 BTUs of natural gas power. It features a compact 24.2-inch height and WiFi connectivity for remote monitoring. The unit is designed for indoor installation with non-condensing venting. It includes precise digital temperature control and built-in freeze protection. This heater suits homes needing high flow rates for multiple simultaneous water points.
Pros
- 9.5 GPM flow rate supports 3-4 simultaneous showers
- WiFi enabled for remote monitoring and control
- Precision ±1°F digital temperature adjustment
- Built-in freeze and flame failure protection
Cons
- Designed for indoor installation only
- Non-condensing design with 0.82 UEF efficiency
- Requires professional installation
Good fit if
- You need high flow for multiple bathrooms
- You want WiFi connectivity for monitoring
- You are replacing a tank heater indoors
Skip if
- You require outdoor installation
- You need liquid propane fuel
- You prefer condensing high-efficiency models
Verdict: Rheem RTG 9.5 GPM Indoor Gas Heater provides strong flow for whole-house use. It fits homes with indoor space and WiFi needs.
Rheem RTG 9.5 GPM Outdoor Propane Tankless Water Heater
Best for: propane homes needing outdoor whole-house hot water
- 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 Rheem unit delivers 9.5 GPM at a 35°F rise using liquid propane. It features 199,900 BTU/hr output and a 0.82 UEF. The outdoor design eliminates venting needs. You get WiFi control and ±1°F temperature precision. The metal cabinet supports wall mounting. It suits large homes needing whole-house hot water without tank storage constraints.
Pros
- 9.5 GPM flow rate for multiple showers
- 199,900 BTU/hr heating capacity
- WiFi enabled for remote monitoring
- Non-condensing outdoor installation saves space
Cons
- Non-condensing design has lower efficiency than condensing models
- Requires professional installation
- Outdoor unit only, not for indoor use
Good fit if
- You have a propane supply
- You need outdoor installation
- You want WiFi control
Skip if
- You need indoor installation
- You use natural gas
- You prefer condensing efficiency
Verdict: Rheem RTG 9.5 GPM Propane Outdoor is a solid choice for propane users needing high flow. It fits homes requiring whole-house capacity with outdoor mounting.
Rheem RTGH Series 9.5 GPM Indoor Natural Gas
Best for: Indoor large families needing high efficiency
- 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 Rheem unit delivers 9.5 GPM at a 35°F rise using 199,900 BTU/hr of natural gas. It features industry-leading condensing technology with a 0.93 UEF, making it highly efficient for indoor installation. The digital LED control offers precision within ±1°F. It is ideal for large families needing hot water for three to four simultaneous showers in multi-bathroom homes.
Pros
- High 0.93 Uniform Energy Factor for ultra-low gas bills
- Digital LED temperature control with ±1°F precision
- 9.5 GPM flow rate for whole-house demand
- Built-in freeze protection and multi-point safety system
Cons
- Indoor installation only, not suitable for outdoor use
- Lacks WiFi connectivity in the No WiFi variant
- Requires professional installation due to direct venting needs
Good fit if
- You need high efficiency for a large family
- You have indoor space for direct venting
- You want precise temperature control
Skip if
- You require outdoor installation
- You want smart home integration
- You need a smaller footprint
Verdict: Rheem RTGH 9.5 GPM Indoor Natural Gas is a high-efficiency choice for indoor homes needing substantial hot water flow. It suits large families who prioritize energy savings and precise temperature control over outdoor flexibility or smart features.
Rinnai 7.6 GPM Outdoor Natural Gas Water Heater
Best for: compact outdoor natural gas installations
- Fuel Type
- Natural Gas
- Flow Rate
- 9.8 GPM
- BTU
- 199k BTU
- Installation Location
- Outdoor
- Dimensions
- 24.6 x 14.1 x 10.8 in
- Venting Type
- Non-Condensing
View on Amazon: Rinnai 7.6 GPM Outdoor Natural Gas Water Heater Affiliate link
The Rinnai RE199eN is a non-condensing natural gas tankless water heater designed for outdoor installation. It delivers a flow rate of 7.6 GPM, supporting up to six fixtures simultaneously. The unit measures 24.6 x 14.1 x 10.8 inches and weighs 53.3 pounds. Its compact footprint makes it suitable for smaller outdoor spaces. You get a clear LED screen for error codes and service reminders. This model offers a 15-year heat exchanger warranty.
Pros
- 7.6 GPM flow rate for multiple fixture use
- Compact outdoor design fits small spaces
- 15-year limited heat exchanger warranty
- LED screen displays error codes and service reminders
Cons
- Lower 7.6 GPM flow rate than 9.5 GPM competitors
- Non-condensing design may have lower efficiency than condensing models
- WiFi control module sold separately
Good fit if
- You need a compact outdoor unit for limited space
- You prefer natural gas fuel type
- You want a reliable unit with a long heat exchanger warranty
Skip if
- You require a flow rate higher than 7.6 GPM
- You need indoor installation capability
- You want included WiFi connectivity without extra purchase
Verdict: Rinnai RE199eN Outdoor Natural Gas Heater suits those prioritizing compact size and durability over maximum flow rate. It is a solid choice for outdoor installations where space is tight and natural gas is available.
Westinghouse 10.3 GPM Natural Gas Tankless Heater
Best for: High-flow indoor natural gas homes
- 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 unit delivers 10.3 GPM at 199,000 BTU. It uses natural gas and features non-condensing technology. You get WiFi and app control for temperature adjustments. The unit weighs 56 pounds. It suits households needing high flow for multiple fixtures. You can manage settings remotely via the app. This model is designed for indoor installation only.
Pros
- 10.3 GPM flow rate
- 199,000 BTU heating power
- WiFi and app control
- Natural gas fuel type
Cons
- Indoor installation only
- Non-condensing efficiency
- No remote control included
Good fit if
- You need high flow for seven fixtures
- You want app-based temperature control
- You have natural gas indoor access
Skip if
- You require outdoor installation
- You need propane fuel compatibility
- You want condensing high efficiency
Verdict: Westinghouse 10.3 GPM Natural Gas Tankless offers strong performance for indoor homes. You get high flow and app control, but it is not for outdoor use.
Takagi Outdoor 8 GPM Natural Gas Water Heater
Best for: Ultra-low NOx emission compliance
- 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 Affiliate link
This Takagi outdoor unit delivers 8 GPM of hot water using natural gas. Its condensing design captures waste heat for higher efficiency. The compact shell measures 24.9 by 17.8 by 11.3 inches. It meets strict 2012 SCAQMD Rule 1146.2 for ultra-low NOx emissions. You get endless hot water without a standing pilot light. This model suits homes needing high flow with lower emissions.
Pros
- 8 GPM flow rate for natural gas
- Condensing technology for high efficiency
- Meets 2012 SCAQMD Rule 1146.2 ultra-low NOx standards
- No standing pilot light required
Cons
- 8 GPM flow is lower than the 9.5 GPM Rheem RTG
- Outdoor installation only
- Condensing design requires specific venting
Good fit if
- You need ultra-low NOx emissions for strict local codes
- You want high efficiency from a condensing unit
- You have outdoor space for installation
Skip if
- You require more than 8 GPM of hot water
- You need an indoor-only installation
- You prefer non-condensing simplicity
Verdict: Takagi T-H3S-OS-N 8 GPM Outdoor Condensing Heater offers strict emission compliance and high efficiency. It fits buyers in areas with tight air quality rules who can accept slightly lower flow than the 9.5 GPM competitors.
Specifications side by side
| Spec | Rheem RTG 9.5 GPM Outdoor Natural Gas Tankless Heater | Rheem RTG 9.5 GPM Natural Gas Water Heater | Rheem RTG 9.5 GPM Outdoor Propane Tankless Water Heater | Rheem RTGH Series 9.5 GPM Indoor Natural Gas | Rinnai 7.6 GPM Outdoor Natural Gas Water Heater | Westinghouse 10.3 GPM Natural Gas Tankless Heater | Takagi Outdoor 8 GPM Natural Gas Water Heater |
|---|---|---|---|---|---|---|---|
| Fuel Type | Natural Gas | Natural Gas | Liquid Propane | Natural Gas | Natural Gas | Natural Gas | Natural Gas |
| Flow Rate | 9.5 GPM | 9.5 GPM | 9.5 GPM | 9.5 GPM at 35°F rise | 9.8 GPM | 10.3 GPM | 8 GPM |
| BTU | 199,900 BTU/hr | 199,900 BTU/hr | 199,900 BTU/hr | 199,900 BTU/hr | 199k BTU | 199,000 BTU/hr | not stated |
| Installation Location | Outdoor | Indoor | Outdoor | Indoor | Outdoor | Indoor | Outdoor |
| Voltage | not stated | not stated | not stated | 120 V | not stated | not stated | not stated |
| Temperature Control | ±1°F | ±1°F | ±1°F | Digital LED, ±1°F | not stated | WiFi & APP control | not stated |
| Certification | CSA | CSA | CSA | CSA | not stated | not stated | not stated |
| Dimensions | 20.8 x 13.5 x 9.4 inches | 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 | 24.6 x 14.1 x 10.8 in | not stated | 24.9 x 17.8 x 11.3 inches |
| Venting Type | Non-Condensing | Non-Condensing | Non-Condensing | not stated | Non-Condensing | Non-Condensing | Condensing |
| Capacity | not stated | not stated | not stated | not stated | not stated | not stated | 8 Gallon |
| Features | WiFi | WiFi | WiFi | WiFi | not stated | WiFi | not stated |
| Material | not stated | not stated | not stated | Stainless Steel | not stated | not stated | not stated |
| Weight | 39.3 pounds | 46.5 pounds | 40.5 pounds | 59.9 pounds | 53.3 pounds | 56 pounds | not stated |
| Size | 9.5 GPM (No WiFi) | 9.5 GPM (WiFi) | 9.5 GPM (WiFi) | 9.5 GPM (No WiFi) | 9.8 GPM | not stated | Medium |
| Color | Gray | Gray | Gray | Gray | Silver | White | White |
| Model | RTG-95XLN-3 | RTG-95DVELN-3 | RTG-95XELP-3 | RTGH-95DVLN-3 | REU-VE2737WD-US-N | not stated | T-H3S-OS-N |
Frequently asked questions
Can I use these alternatives for outdoor installation?
Only specific models support outdoor mounting. The Rheem RTG 9.5 GPM Outdoor Natural Gas and Propane versions are built for exterior use. The Rinnai RE199eN is also designed for outdoors. Indoor-only units like the Rheem RTG Indoor and Westinghouse 10.3 GPM models must be installed inside to function safely and meet code requirements.
Which unit has the highest flow rate?
The Westinghouse 10.3 GPM Natural Gas Tankless Heater offers the highest flow rate in this group. Several Rheem models, including the RTG 9.5 GPM variants and the RTGH Series, provide 9.5 GPM. The Rinnai unit lists a size of 9.8 GPM, while the Takagi model delivers 8 GPM for whole-house demand.
Do I need WiFi for these tankless heaters?
WiFi is not required for basic operation but adds convenience. Most Rheem models in this list include WiFi features for remote control. The Westinghouse unit also offers app control. However, the Rheem RTG 9.5 GPM Outdoor Natural Gas model operates without WiFi. The Rinnai and Takagi units do not list WiFi as a feature.
Are condensing units available as alternatives?
Yes, the Takagi Outdoor 8 GPM Natural Gas Water Heater is a condensing option. It provides ultra-low NOx emission compliance and high efficiency. All other listed models, including the Rheem RTG and RTGH series, the Rinnai, and the Westinghouse unit, use non-condensing venting technology for their operation.
Which heater is best for propane homes?
The Rheem RTG 9.5 GPM Outdoor Propane Tankless Water Heater is designed specifically for propane. It delivers 9.5 GPM and includes WiFi connectivity. It is suitable for outdoor whole-house hot water needs. No other listed alternative supports propane fuel type in the provided data.
Which model is the most compact for outdoor spaces?
The Rheem RTG 9.5 GPM Outdoor Natural Gas model is quite compact, measuring 13.5 inches wide and 9.4 inches deep. The Rinnai RE199eN is also noted for its compact size and durability. The Westinghouse unit has unusually small listed dimensions, but it is indoor-only. Check your specific space requirements before choosing.
Is stainless steel construction available?
The Rheem RTGH Series 9.5 GPM Indoor Natural Gas model features stainless steel construction. This material supports its high-efficiency design for indoor large families. Other models in this comparison do not list stainless steel as a primary material in the provided specifications.