6 Best Alternatives to the Rheem RTG Series 7.0 GPM Liquid Propane Tankless Water Heater (2026)
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The Rheem RTG Series 7.0 GPM Liquid Propane Tankless Water Heater delivers steady indoor performance with 160,000 BTUs and precise temperature control. You get endless hot water for two to three simultaneous showers, backed by a non-condensing design that fits standard indoor venting. Its 0.82 UEF rating offers efficiency, and the compact 24.2-inch height saves wall space. This unit suits homes that need reliable propane heating without smart features.
You might look elsewhere if you need a higher flow rate for larger families, or if your home requires outdoor installation instead of indoor placement. Some buyers prefer different brands like Rinnai or MIZUDO for specific warranty terms or app connectivity. This list of 6 alternatives includes models with overlapping propane specs, varying GPM outputs, and different venting types. Each option matches the core requirements of indoor or outdoor propane heating while offering distinct advantages in size, capacity, or control features.
Our top pick: Rheem RTG Series 7.0 GPM Propane Tankless Water Heater.
How alternatives compare to Rheem RTG
Rinnai RE160iP 6.6 GPM Propane Indoor
The Rinnai RE160iP offers a slightly lower flow rate of 6.6 GPM compared to the Rheem RTG Series 7.0 GPM unit. This reduction means it may struggle to support three simultaneous showers in cold climates, whereas the Rheem model maintains 7.0 GPM at a 35°F temperature rise. The Rinnai is larger, measuring 27.3 inches in height versus 24.2 inches for the Rheem. It weighs 48.5 pounds, making it slightly heavier than the 46.5-pound Rheem. Both units are indoor, propane-fueled, and non-condensing. The Rinnai appeals to users prioritizing long-term durability and warranty coverage over maximum flow capacity. If your household uses fewer than three fixtures at once, this smaller footprint and robust build make it a practical alternative.
Rheem RTG 8.4 GPM Outdoor Propane Tankless Water Heater
The Rheem RTG 8.4 GPM Outdoor Propane unit increases flow capacity to 8.4 GPM, allowing for more simultaneous water usage than the 7.0 GPM indoor model. This outdoor unit is shorter, standing 20.8 inches tall compared to the 24.2-inch indoor version, and weighs less at 39.3 pounds. It retains the non-condensing venting type but is designed for exterior mounting, freeing up indoor space. The indoor Rheem RTG 7.0 GPM is better suited for homes where venting through walls is complex or where space is tight indoors. Choose the outdoor 8.4 GPM model if you have exterior wall space and need higher flow for larger families. The indoor 7.0 GPM remains ideal for precise temperature control in confined indoor areas.
MIZUDO 7.9 GPM Indoor Propane Tankless Heater with WiFi
The MIZUDO 7.9 GPM Indoor Propane Heater provides a higher flow rate than the Rheem RTG Series 7.0 GPM model, delivering 7.9 GPM for better performance during peak usage. It features WiFi connectivity, allowing remote monitoring and control via an app, which the standard Rheem RTG 7.0 GPM lacks. The MIZUDO unit is larger, measuring 16.3 inches in width and depth, compared to the Rheem’s 13.5-inch width. It also weighs less at 39.6 pounds. Both are indoor, propane-fueled units. The MIZUDO is ideal for users who want smart home integration and slightly higher hot water output. The Rheem RTG 7.0 GPM remains a strong choice for those who prefer manual digital control and a more compact footprint without smart features.
Rheem RTG 9.5 GPM Natural Gas Water Heater
The Rheem RTG 9.5 GPM Natural Gas unit offers significantly higher flow capacity than the propane 7.0 GPM model, supporting more simultaneous showers. It runs on natural gas instead of propane, requiring a different fuel connection. Like the indoor propane model, it features WiFi connectivity for remote management. The dimensions are identical to the indoor propane RTG 7.0 GPM, measuring 24.2 inches in height and 13.5 inches in width. It weighs the same at 46.5 pounds. This model is best for large households with natural gas lines who need maximum hot water volume. The propane RTG 7.0 GPM is better for homes without natural gas infrastructure or those preferring propane fuel flexibility.
Westinghouse 10.3 GPM Natural Gas Tankless Heater
The Westinghouse 10.3 GPM Natural Gas Heater provides the highest flow rate on this list, significantly outperforming the Rheem RTG 7.0 GPM propane model. It delivers 199,000 BTUs, ensuring robust hot water supply for large homes. It includes WiFi features for app control, unlike the standard Rheem RTG 7.0 GPM. The unit is designed for indoor installation with non-condensing venting. While specific dimensions are not fully detailed, it weighs 56 pounds, making it heavier than the 46.5-pound Rheem. This model suits large households with natural gas access who prioritize maximum flow and smart connectivity. The Rheem RTG 7.0 GPM propane unit remains suitable for smaller homes or those without natural gas lines.
Rheem RTG 8.4 GPM Outdoor Natural Gas Tankless Heater
The Rheem RTG 8.4 GPM Outdoor Natural Gas unit combines higher flow with outdoor installation flexibility. It delivers 8.4 GPM, exceeding the 7.0 GPM output of the indoor propane model. It runs on natural gas and features WiFi connectivity for remote control. The unit is shorter, measuring 20.8 inches in height, and weighs 39.3 pounds, making it lighter than the indoor Rheem RTG 7.0 GPM. It is designed for exterior mounting, which saves indoor space and simplifies venting. Choose this model if you have outdoor space and natural gas access. The indoor propane RTG 7.0 GPM is better for homes where outdoor installation is not feasible or where propane fuel is preferred.
Quick picks
Our 7 picks
Rheem RTG Series 7.0 GPM Propane Tankless Water Heater
Best for: Indoor propane homes needing precise temp control
- Fuel Type
- Liquid Propane
- Flow Rate
- 7.0 GPM
- BTU
- 160,000 BTU/hr
- Installation Location
- Indoor
- Temperature Control
- ±1°F
- Certification
- CSA
View on Amazon: Rheem RTG Series 7.0 GPM Propane Tankless Water Heater
This Rheem unit delivers 7.0 GPM of hot water using liquid propane. It features 160,000 BTU/hr output and a 0.82 UEF for efficiency. The indoor design includes a digital LED panel with ±1°F precision. It supports 2-3 simultaneous showers. You get built-in freeze protection and a 15-year heat exchanger warranty. It fits homes needing reliable whole-house heating without condensing complexity.
Pros
- 7.0 GPM flow rate for multiple fixtures
- 160,000 BTU/hr high output
- 0.82 UEF energy efficiency
- ±1°F digital temperature control
- 15-year heat exchanger warranty
Cons
- Indoor installation only
- No WiFi connectivity
- Lower flow rate than 9.5 GPM competitors
Good fit if
- You need a propane unit for indoor use
- You want precise temperature control
- You prefer a non-condensing design
Skip if
- You require outdoor installation
- You need smart home integration
- You need higher than 7.0 GPM flow
Verdict: Rheem RTG 7.0 GPM Propane Indoor offers solid efficiency and precision for indoor propane setups, making it a strong match for homes that do not need smart features or higher flow rates.
Rinnai RE160iP 6.6 GPM Propane Indoor
Best for: Indoor propane users prioritizing warranty and durability
- Fuel Type
- Propane
- Flow Rate
- 6.6 GPM
- Installation Location
- Indoor
- Dimensions
- 27.3 x 14.1 x 10.8 inches
- Venting Type
- Non-Condensing
- Weight
- 48.5 pounds
The Rinnai RE160iP is a non-condensing indoor propane tankless water heater with a 6.6 GPM flow rate. It measures 14.1 by 27.3 by 10.8 inches and weighs 48.5 pounds. The unit features an LED screen for error codes and service reminders. It includes a 15-year heat exchanger warranty and a 5-year parts warranty. You should consider this model if you need a reliable propane solution for indoor installation.
Pros
- 6.6 GPM flow rate for multiple fixtures
- Compact indoor design fits small spaces
- 15-year limited heat exchanger warranty
- LED screen displays error codes and reminders
Cons
- Lower flow rate than 8.4 or 9.5 GPM competitors
- WiFi control requires separate purchase
- Professional installation is recommended
Good fit if
- You need a propane tankless heater for indoor use
- You prioritize a long heat exchanger warranty
- You want a compact unit with clear error diagnostics
Skip if
- You require a flow rate above 7.0 GPM
- You want built-in WiFi connectivity without extra parts
- You are looking for a natural gas model
Verdict: Rinnai RE160iP 6.6 GPM Propane Indoor is a solid choice for homes needing a durable indoor propane heater with strong warranty coverage, though its flow rate suits smaller households better than larger ones.
Rheem RTG 8.4 GPM Outdoor Propane Tankless Water Heater
Best for: large families with outdoor installation space
- Fuel Type
- Liquid Propane
- Flow Rate
- 8.4 GPM at 35°F rise
- BTU
- 180,000 BTU/hr
- Installation Location
- Outdoor
- Temperature Control
- Digital LED, ±1°F
- Certification
- CSA
View on Amazon: Rheem RTG 8.4 GPM Outdoor Propane Tankless Water Heater
This outdoor unit delivers 8.4 GPM at a 35°F rise using 180,000 BTU/hr of liquid propane power. It features a non-condensing design with a 0.82 UEF rating and digital LED control with ±1°F precision. The metal cabinet supports wall mounting. It suits large families needing whole-house hot water without indoor venting requirements.
Pros
- 8.4 GPM flow rate for 3-4 simultaneous showers
- Digital LED control with ±1°F temperature precision
- 0.82 Uniform Energy Factor (UEF) for efficiency
- Outdoor installation eliminates complex venting
Cons
- Non-condensing design limits efficiency compared to condensing models
- No WiFi connectivity for remote control
- Requires professional installation
Good fit if
- You need high flow for multiple bathrooms
- You have outdoor space for wall mounting
- You prefer propane fuel source
Skip if
- You require indoor installation
- You want smart home integration
- You need condensing efficiency
Verdict: Rheem RTG Series 8.4 GPM Propane Outdoor provides robust hot water for large households with outdoor space. It fits buyers prioritizing flow rate and propane efficiency over smart features.
MIZUDO 7.9 GPM Indoor Propane Tankless Heater with WiFi
Best for: Indoor propane users needing app control
- Fuel Type
- Propane
- Flow Rate
- 7.9 GPM
- BTU
- 180,000 BTU/h
- Installation Location
- Indoor
- Voltage
- 120V AC
- Temperature Control
- ±1°F
View on Amazon: MIZUDO 7.9 GPM Indoor Propane Tankless Heater with WiFi
This MIZUDO unit delivers 7.9 GPM at 180,000 BTU/h for indoor propane use. It features WiFi app control and a copper heat exchanger with ±1°F stability. The sealed combustion system draws air from outside. It suits larger households needing steady hot water across multiple fixtures. You get remote monitoring and precise temperature adjustments for daily routines.
Pros
- 7.9 GPM flow rate for simultaneous use
- WiFi app control for remote monitoring
- ±1°F temperature stability with self-modulating control
- Indoor sealed combustion with direct-vent capability
Cons
- 2-year unit warranty is shorter than typical competitors
- Indoor installation requires specific venting clearances
- Heavier build at 39.6 pounds
Good fit if
- You need WiFi control for remote monitoring
- You require 7.9 GPM for larger households
- You are installing an indoor propane unit
Skip if
- You need outdoor installation only
- You want a 5-year unit warranty
- You prefer natural gas fuel
Verdict: MIZUDO 7.9 GPM Propane Indoor Heater offers precise temperature control and app connectivity for indoor propane setups. It fits users who want remote monitoring and steady flow for multiple fixtures.
Rheem RTG 9.5 GPM Natural Gas Water Heater
Best for: large families with multiple bathrooms
- Fuel Type
- Natural Gas
- Flow Rate
- 9.5 GPM
- BTU
- 199,900 BTU/hr
- Installation Location
- Indoor
- Temperature Control
- ±1°F
- Certification
- CSA
This Rheem unit delivers 9.5 GPM of hot water using natural gas. It features 199,900 BTUs and a 0.82 UEF for efficiency. The indoor design includes WiFi control and digital temperature adjustments. It suits large homes needing simultaneous hot water. The compact wall-mount size saves floor space. You get consistent temperatures with ±1°F precision for reliable daily use.
Pros
- 9.5 GPM flow rate supports 3-4 showers
- WiFi enabled for remote monitoring
- Digital LED control with ±1°F precision
- 0.82 Uniform Energy Factor rating
Cons
- Indoor installation only
- Requires professional setup
- Non-condensing venting type
Good fit if
- You need high flow for multiple bathrooms
- You want smart home integration
- You have indoor gas hookups
Skip if
- You require outdoor installation
- You prefer propane fuel
- You want DIY assembly
Verdict: Rheem RTG Series 9.5 GPM Natural Gas fits busy households needing reliable whole-house hot water with smart controls. It is ideal for large families with multiple simultaneous water demands.
Westinghouse 10.3 GPM Natural Gas Tankless Heater
Best for: large households with natural gas
- 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
This Westinghouse unit delivers 10.3 GPM at 199,000 BTU for indoor natural gas use. It features WiFi app control and non-condensing technology. The high flow rate supports up to seven fixtures. You get precise temperature management through the app. This model suits large households needing strong hot water output. It is a robust option for indoor installation where high capacity is required.
Pros
- 10.3 GPM flow rate
- 199,000 BTU output
- WiFi app control
- Indoor installation design
Cons
- Natural gas only, not propane
- Non-condensing efficiency
- Indoor installation requirement
Good fit if
- You need high flow for multiple fixtures
- You have natural gas supply
- You want app control
Skip if
- You use propane fuel
- You need outdoor installation
- You want condensing efficiency
Verdict: Westinghouse 10.3 GPM Natural Gas Heater offers high capacity for large homes. It fits users who need strong hot water and app management.
Rheem RTG 8.4 GPM Outdoor Natural Gas Tankless Heater
Best for: outdoor natural gas whole-house use
- Fuel Type
- Natural Gas
- Flow Rate
- 8.4 GPM
- BTU
- 180,000 BTU/hr
- Installation Location
- Outdoor
- Temperature Control
- ±1°F
- Certification
- CSA
View on Amazon: Rheem RTG 8.4 GPM Outdoor Natural Gas Tankless Heater
This Rheem unit delivers 8.4 GPM of hot water using natural gas. It features a 180,000 BTU/hr output and non-condensing design. The outdoor build eliminates venting needs. You get precise temperature control with ±1°F adjustments. The durable metal cabinet supports wall mounting. It includes built-in freeze protection. This model suits whole-house needs for 3-4 simultaneous showers.
Pros
- 8.4 GPM flow rate at 35°F rise
- 180,000 BTU/hr heating capacity
- Outdoor installation without venting
- ±1°F temperature precision
- Non-condensing efficiency
Cons
- Natural Gas only, not Propane
- No WiFi connectivity in this version
- Professional installation required
Good fit if
- You need an outdoor unit
- You have natural gas supply
- You want whole-house capacity
Skip if
- You use liquid propane
- You need indoor installation
- You want smart features
Verdict: Rheem RTG 8.4 GPM Outdoor Natural Gas provides high flow for outdoor natural gas setups. It fits homes needing reliable whole-house hot water without venting complexity.
Specifications side by side
| Spec | Rheem RTG Series 7.0 GPM Propane Tankless Water Heater | Rinnai RE160iP 6.6 GPM Propane Indoor | Rheem RTG 8.4 GPM Outdoor Propane Tankless Water Heater | MIZUDO 7.9 GPM Indoor Propane Tankless Heater with WiFi | Rheem RTG 9.5 GPM Natural Gas Water Heater | Westinghouse 10.3 GPM Natural Gas Tankless Heater | Rheem RTG 8.4 GPM Outdoor Natural Gas Tankless Heater |
|---|---|---|---|---|---|---|---|
| Fuel Type | Liquid Propane | Propane | Liquid Propane | Propane | Natural Gas | Natural Gas | Natural Gas |
| Flow Rate | 7.0 GPM | 6.6 GPM | 8.4 GPM at 35°F rise | 7.9 GPM | 9.5 GPM | 10.3 GPM | 8.4 GPM |
| BTU | 160,000 BTU/hr | not specified | 180,000 BTU/hr | 180,000 BTU/h | 199,900 BTU/hr | 199,000 BTU/hr | 180,000 BTU/hr |
| Installation Location | Indoor | Indoor | Outdoor | Indoor | Indoor | Indoor | Outdoor |
| Voltage | not specified | not specified | not specified | 120V AC | not specified | not specified | not specified |
| Temperature Control | ±1°F | not specified | Digital LED, ±1°F | ±1°F | ±1°F | WiFi & APP control | ±1°F |
| Certification | CSA | not specified | CSA | CSA | CSA | not specified | CSA |
| Dimensions | 24.2 x 13.5 x 10.3 inches | 27.3 x 14.1 x 10.8 inches | 20.8 x 13.5 x 9.4 inches | 25 x 16.3 x 7.3 in | 24.2 x 13.5 x 10.3 inches | not specified | 20.8 x 13.5 x 9.4 inches |
| Venting Type | Non-Condensing | Non-Condensing | Non-Condensing | not specified | Non-Condensing | Non-Condensing | Non-Condensing |
| Features | WiFi | not specified | WiFi | WiFi | WiFi | WiFi | WiFi |
| Weight | 46.5 pounds | 48.5 pounds | 39.3 pounds | 39.6 pounds | 46.5 pounds | 56 pounds | 39.3 pounds |
| Size | 7.0 GPM (No WiFi) | 6.6 GPM | 8.4 GPM (Non-WiFi) | Propane Gas, 7.9 GPM, 180,000 BTU, Indoor | 9.5 GPM (WiFi) | not specified | 8.4 GPM (No WiFi) |
| Color | Gray | Silver | Gray | White 7.9P | Gray | White | Gray |
| Model | RTG-70DVLP-3 | REU-VE2125FFD-US-P | RTG-84XLP-3 | HW180A0W-LP | RTG-95DVELN-3 | not specified | RTG-84XLN-3 |
If you use LP outdoors, you can compare output ratings for the best propane patio heaters.
Frequently asked questions
What is the best alternative to the Rheem RTG 7.0 GPM for indoor propane use?
The Rinnai RE160iP is the top budget alternative. It offers 6.6 GPM for indoor propane setups with non-condensing venting. Its dimensions are 14.1 inches wide and 27.3 inches tall. This model suits smaller households better than larger ones due to the lower flow rate.
Can I get a higher flow rate with propane indoors?
The MIZUDO 7.9 GPM model provides higher indoor propane flow. It measures 16.3 inches wide and 25 inches tall. This unit includes WiFi for app control. It delivers steady flow for multiple fixtures, making it a strong choice for users needing more water capacity.
Is there a propane option for outdoor installation?
The Rheem RTG 8.4 GPM Outdoor Propane unit is designed for outside use. It delivers 8.4 GPM with non-condensing venting. The unit is 13.5 inches wide and 20.8 inches tall. It fits buyers prioritizing flow rate and propane efficiency over smart features.
What is the largest propane tankless water heater listed?
The MIZUDO 7.9 GPM is the largest propane option. It weighs 39.6 pounds and features WiFi connectivity. The unit is 16.3 inches wide and 25 inches tall. It provides precise temperature control for indoor propane setups, supporting multiple simultaneous water demands effectively.
Do these alternatives support smart home integration?
Several models include WiFi for remote monitoring. The Rheem RTG 7.0 GPM and MIZUDO 7.9 GPM both feature WiFi. The Rinnai RE160iP does not list this feature. Smart connectivity allows you to adjust settings via an app for better convenience and control.
How do the dimensions compare for indoor propane units?
Indoor propane units vary in size. The Rinnai RE160iP is 14.1 inches wide and 27.3 inches tall. The MIZUDO 7.9 GPM is wider at 16.3 inches but slightly shorter at 25 inches tall. The Rheem RTG 7.0 GPM is 13.5 inches wide and 24.2 inches tall.
Which model is best for large families using propane?
The MIZUDO 7.9 GPM is ideal for large families. It offers higher flow than the standard 7.0 GPM model. Its indoor propane design supports multiple fixtures. The WiFi feature adds convenience for managing hot water in busy households with high simultaneous demand.
Are there non-condensing propane options available?
Yes, all listed propane models use non-condensing venting. This includes the Rheem RTG 7.0 GPM, Rinnai RE160iP, MIZUDO 7.9 GPM, and Rheem RTG 8.4 GPM Outdoor. Non-condensing designs fit standard indoor venting configurations, simplifying installation for propane users.