Looking Beyond the Takagi 6.6 GPM Propane Outdoor? 6 Alternatives Worth a Look
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If you are researching takagi 6 6 gpm propane outdoor alternatives, you likely need a reliable outdoor heating solution. The Takagi T-H3J-OS-P delivers 6.6 GPM with condensing efficiency and ultra-low NOx emissions. It fits strict emission zones and offers a compact 24.9-inch height. However, you might want higher flow, a different fuel type, or a non-condensing design for simpler maintenance.
We selected 6 alternatives that share core specifications with this unit. These options include propane and natural gas models with varying flow rates from 5.0 to 9.5 GPM. Some prioritize WiFi connectivity, while others focus on compact dimensions or budget-friendly pricing. Each alternative overlaps with the original in installation location and fuel type. This ensures you can compare practical specs side by side. You can choose based on whether you need more water volume, smart features, or a different brand. The list covers the most relevant options for outdoor propane and natural gas installations.
Our top pick: Takagi 6.6 GPM Propane Outdoor Heater.
Key Differences Between Alternatives
Takagi Outdoor Propane Tankless Water Heater
The Takagi 8 GPM Propane Outdoor Heater raises the flow rate from 6.6 to 8 gallons per minute. It keeps the same compact footprint and condensing venting design as your current choice. The unit weighs 69 pounds, which is 17 pounds heavier than the 6.6 GPM model. You gain more simultaneous hot water capacity for larger households. You trade slightly higher weight for increased output. This option suits buyers who need extra flow without changing their outdoor space or venting setup. It maintains the same emission compliance standards.
Rinnai RE180eP Outdoor Propane Water Heater
The Rinnai RE180eP Propane Outdoor Heater drops the flow rate to 5.0 GPM. It uses non-condensing venting instead of the condensing system in the Takagi. The unit is lighter at 50 pounds and narrower at 14.1 inches wide. You save space and weight but lose the efficiency benefits of condensing technology. The lower flow rate makes it less suitable for homes with high simultaneous demand. This model fits tight outdoor areas where size matters more than maximum output. You prioritize compactness and reliability over high-volume hot water delivery.
Rheem RTG 9.5 GPM Outdoor Propane Tankless Water Heater
The Rheem RTG 9.5 GPM Outdoor Propane Heater offers a significant flow increase to 9.5 gallons per minute. It uses non-condensing venting and includes WiFi connectivity for remote control. The unit is lighter at 40.5 pounds and shorter at 20.8 inches high. You gain substantial hot water volume and smart features but sacrifice the ultra-low NOx emissions of the condensing Takagi. This choice suits large households needing maximum flow and digital management. You prioritize performance and connectivity over strict emission compliance and energy efficiency.
Takagi Outdoor 8 GPM Natural Gas Water Heater
The Takagi 8 GPM Natural Gas Outdoor Heater switches fuel from propane to natural gas. It maintains the 8 GPM flow rate and condensing venting design. The unit shares the same dimensions and white finish as the propane models. You gain the convenience of natural gas infrastructure while keeping high efficiency. The flow rate is higher than the 6.6 GPM propane unit. This option fits homes with existing natural gas lines that want better performance. You trade propane availability for natural gas convenience and increased output.
Rinnai 9 GPM Outdoor Propane Condensing Heater
The Rinnai RUR160EP 9 GPM Outdoor Propane Heater increases flow to 9 gallons per minute. It uses condensing venting like the Takagi but is much bulkier at 33.9 inches high and 22.1 inches long. The unit weighs 80.9 pounds, significantly more than the compact Takagi. You gain high flow and smart recirculation features but lose the space-saving design. The larger footprint requires more outdoor clearance. This model suits large households needing maximum output and recirculation. You prioritize flow and features over compact size and lighter weight.
Takagi T-H3M Outdoor Natural Gas Heater
The Takagi T-H3M Outdoor Natural Gas Heater switches to natural gas and maintains condensing efficiency. It offers a compact design with a white finish. The unit is 29.5 inches high and 13.1 inches wide, differing in shape from the propane models. You gain natural gas convenience and space-saving efficiency. The dimensions vary slightly, requiring a different installation space. This choice fits homes with natural gas lines that need a small outdoor footprint. You trade propane for natural gas while keeping the same high-efficiency condensing technology.
Quick picks
Our 7 picks
Takagi 6.6 GPM Propane Outdoor Heater
Best for: Emission-restricted outdoor propane installations
- Fuel Type
- Propane
- Flow Rate
- 6.6 GPM
- Installation Location
- Outdoor
- Dimensions
- 24.9 x 17.8 x 11.3 in
- Venting Type
- Condensing
- Capacity
- 4.0 Gallons
View on Amazon: Takagi 6.6 GPM Propane Outdoor Heater Affiliate link
The Takagi T-H3J-OS-P is a condensing propane water heater designed for outdoor installation. It delivers 6.6 GPM of hot water with a compact footprint measuring 24.9 x 17.8 x 11.3 inches. This unit meets SCAQMD Rule 1146.2 for ultra-low NOx emissions. It features computerized safety controls and operates without a pilot light. You should consider this model if you need reliable outdoor heating with high efficiency and strict emission compliance.
Pros
- 6.6 GPM flow rate for steady hot water
- Condensing design for high energy efficiency
- Meets SCAQMD Rule 1146.2 ultra-low NOx standards
- Compact outdoor dimensions: 24.9 x 17.8 x 11.3 in
Cons
- 6.6 GPM is lower than competitors offering 9.5 GPM
- Heavier at 52 pounds, requiring sturdy mounting
- No remote control or app connectivity listed
Good fit if
- You need an outdoor unit in emission-restricted areas
- You want a compact heater for tight spaces
- You prefer propane fuel for off-grid reliability
Skip if
- You require more than 6.6 GPM for large homes
- You need indoor installation capabilities
- You want smart home integration features
Verdict: Takagi T-H3J-OS-P 6.6 GPM Propane Outdoor is ideal for buyers in strict emission zones who prioritize efficiency over maximum flow rate. It suits small to medium households needing a durable, compact outdoor propane heater.
Takagi Outdoor Propane Tankless Water Heater
Best for: High-flow outdoor propane needs
- Fuel Type
- Propane
- Flow Rate
- 8 GPM
- Installation Location
- Outdoor
- Dimensions
- 24.9 x 17.8 x 11.3 in
- Venting Type
- Condensing
- Capacity
- 8 Gallon
View on Amazon: Takagi Outdoor Propane Tankless Water Heater Affiliate link
The Takagi T-H3S-OS-P delivers 8 GPM of hot water using propane. This condensing unit operates outdoors and meets strict SCAQMD Rule 1146.2 for ultra-low NOx emissions. It features computerized safety controls and eliminates the need for a pilot light. The compact design saves space while providing on-demand heating. It suits outdoor installations where high efficiency and clean emissions are priorities.
Pros
- 8 GPM flow rate
- Condensing technology for high efficiency
- Meets SCAQMD Rule 1146.2 emission standards
- No pilot light required
Cons
- Heavier at 69 pounds
- Larger footprint than non-condensing models
- Propane only
Good fit if
- You need high flow for multiple bathrooms
- You live in an area with strict emission rules
- You want a condensing outdoor unit
Skip if
- You need natural gas
- You have limited wall space for a heavier unit
- You want a non-condensing install
Verdict: Takagi 8 GPM Propane Outdoor Tankless provides strong performance for high-demand households. It fits outdoor spaces where emission compliance and efficiency matter most.
Rinnai RE180eP Outdoor Propane Water Heater
Best for: Compact outdoor propane installations
- Fuel Type
- Propane
- Flow Rate
- 8.5 GPM
- Installation Location
- Outdoor
- Dimensions
- 24.6 x 14.1 x 10.8 inches
- Venting Type
- Non-Condensing
- Weight
- 50 pounds
View on Amazon: Rinnai RE180eP Outdoor Propane Water Heater Affiliate link
The Rinnai RE180eP is a non-condensing propane tankless water heater designed for outdoor installation. It delivers up to 6.9 GPM, supporting five simultaneous fixtures. The unit measures 24.6 x 14.1 x 10.8 inches and weighs 50 pounds, fitting into compact spaces. It features an LED screen for error codes and service reminders. This model suits you if you need reliable hot water without the complexity of condensing technology.
Pros
- Delivers 6.9 GPM flow rate for multiple fixtures
- Compact dimensions fit small outdoor spaces
- Includes 15-year heat exchanger warranty
- LED screen displays service reminders and error codes
Cons
- Lower flow rate compared to 9.5 GPM competitors
- Non-condensing design may be less efficient
- WiFi control requires separate Controlr module
Good fit if
- You need a compact outdoor propane heater
- You want a non-condensing unit for easier installation
- You prioritize a long heat exchanger warranty
Skip if
- You require more than 6.9 GPM flow
- You need built-in WiFi connectivity
- You prefer a condensing high-efficiency model
Verdict: The Rinnai RE180eP Propane Outdoor Heater is a compact, reliable option for users who need a non-condensing unit with a strong warranty. It fits well in tight spaces but may fall short for high-demand households needing higher flow rates.
Rheem RTG 9.5 GPM Outdoor Propane Tankless Water Heater
Best for: High-flow outdoor propane needs
- 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
The Rheem RTG-95XELP-3 delivers 9.5 GPM of hot water using 199,900 BTUs of propane power. Its non-condensing design allows for direct outdoor installation without complex venting. You get precise temperature control with ±1°F adjustments and WiFi connectivity for remote management. This unit suits large households needing high flow rates for multiple simultaneous showers while saving energy compared to traditional tank heaters.
Pros
- High 9.5 GPM flow rate for whole-house use
- Precise ±1°F digital temperature control
- WiFi enabled for remote monitoring
- Non-condensing design simplifies outdoor installation
Cons
- Heavier build at 40.5 pounds
- Non-condensing efficiency lower than condensing competitors
- Professional installation is required
Good fit if
- You need high flow for 3-4 simultaneous showers
- You want WiFi control for your water heater
- You are installing outdoors without complex venting
Skip if
- You prefer condensing models for maximum efficiency
- You want a DIY-friendly indoor setup
- You need a smaller footprint under 10 inches wide
Verdict: Rheem RTG 9.5 GPM Propane Outdoor provides substantial hot water volume and smart features for large outdoor installations. It fits homes prioritizing flow rate and remote control over maximum energy efficiency.
Takagi Outdoor 8 GPM Natural Gas Water Heater
Best for: Natural gas outdoor installations
- 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 model delivers 8 GPM of hot water using natural gas. It is designed for outdoor installation and features condensing technology for high efficiency. The unit meets ultra-low NOx emission standards. Its compact dimensions help save space. You should consider this if you need reliable on-demand heating with strong flow rates for multiple fixtures.
Pros
- 8 GPM flow rate
- Natural gas fuel type
- Condensing high efficiency design
- Outdoor installation ready
- Ultra-low NOx emissions compliant
Cons
- Lower flow rate than 9.5 GPM competitors
- Natural gas only, not propane
- No remote control listed in specs
Good fit if
- You have a natural gas supply line
- You need outdoor installation capability
- You want high efficiency condensing technology
Skip if
- You only have propane available
- You need more than 8 GPM flow
- You require indoor installation options
Verdict: Takagi 8 GPM Natural Gas Outdoor Unit offers solid performance for natural gas homes. It fits users who prioritize efficiency and emission compliance over maximum flow speed.
Rinnai 9 GPM Outdoor Propane Condensing Heater
Best for: High-flow outdoor propane needs
- 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 Affiliate link
The Rinnai RUR160EP is a condensing propane tankless water heater designed for outdoor installation. It delivers 9 GPM of hot water, making it suitable for homes with multiple simultaneous uses. This unit includes ThermaCirc360 technology with a built-in recirculation pump, timer, and thermal bypass valve to reduce wait times without a dedicated return line. It measures 33.9 x 14.8 x 22.1 inches and weighs 80.9 pounds.
Pros
- 9 GPM flow rate for high demand
- Built-in recirculation pump and thermal bypass
- Condensing design for energy efficiency
- 15-year heat exchanger warranty
Cons
- Discontinued model, replaced by RSC160eP
- Heavier at 80.9 pounds than non-condensing peers
- Larger dimensions than compact alternatives
Good fit if
- You need 9 GPM for multiple bathrooms
- You want recirculation without a return line
- You prefer condensing efficiency outdoors
Skip if
- You need the latest available model
- You require a lighter unit for mounting
- You prefer non-condensing simplicity
Verdict: Rinnai RUR160EP 9 GPM Propane Outdoor offers strong flow and smart recirculation for large households, though its discontinued status and bulkier build may steer some buyers toward newer or lighter options.
Takagi T-H3M Outdoor Natural Gas Heater
Best for: natural gas outdoor installations
- Fuel Type
- Natural Gas
- Installation Location
- Outdoor
- Dimensions
- 29.5 x 13.1 x 17.8 inches
- Venting Type
- Condensing
- Weight
- 44 pounds
View on Amazon: Takagi T-H3M Outdoor Natural Gas Heater Affiliate link
This Takagi unit is a condensing outdoor tankless water heater designed for natural gas. It delivers hot water with a compact footprint measuring 29.5 by 13.1 by 17.8 inches. The white exterior blends into outdoor spaces. Weighing 44 pounds, it is lighter than many competitors. This model suits homes with existing natural gas lines that need an efficient, space-saving solution for outdoor installation.
Pros
- Condensing technology for high efficiency
- Compact outdoor design fits tight spaces
- Lightweight at 44 pounds
- Natural gas fuel type
Cons
- Limited to natural gas fuel
- No digital display mentioned in data
- Lower flow rate than 9.5 GPM alternatives
Good fit if
- You have a natural gas supply
- You need an outdoor installation
- You want a compact footprint
Skip if
- You require propane fuel
- You need high flow rates above 6 GPM
- You prefer indoor installation
Verdict: Takagi T-H3M-OS-N Natural Gas Outdoor Unit is a compact, efficient choice for homes with natural gas lines that need a space-saving outdoor solution. It fits well where space is tight and gas infrastructure is already in place.
Specifications side by side
| Spec | Takagi 6.6 GPM Propane Outdoor Heater | Takagi Outdoor Propane Tankless Water Heater | Rinnai RE180eP Outdoor Propane Water Heater | Rheem RTG 9.5 GPM Outdoor Propane Tankless Water Heater | Takagi Outdoor 8 GPM Natural Gas Water Heater | Rinnai 9 GPM Outdoor Propane Condensing Heater | Takagi T-H3M Outdoor Natural Gas Heater |
|---|---|---|---|---|---|---|---|
| Fuel Type | Propane | Propane | Propane | Liquid Propane | Natural Gas | Propane | Natural Gas |
| Flow Rate | 6.6 GPM | 8 GPM | 8.5 GPM | 9.5 GPM | 8 GPM | 9 GPM | not stated |
| BTU | not stated | not stated | not stated | 199,900 BTU/hr | not stated | not stated | not stated |
| Installation Location | Outdoor | Outdoor | Outdoor | Outdoor | Outdoor | Outdoor | Outdoor |
| Temperature Control | not stated | not stated | not stated | ±1°F | not stated | not stated | not stated |
| Certification | not stated | not stated | not stated | CSA | not stated | not stated | not stated |
| Dimensions | 24.9 x 17.8 x 11.3 in | 24.9 x 17.8 x 11.3 in | 24.6 x 14.1 x 10.8 inches | 20.8 x 13.5 x 9.4 inches | 24.9 x 17.8 x 11.3 inches | 33.9 x 14.8 x 22.1 inches | 29.5 x 13.1 x 17.8 inches |
| Venting Type | Condensing | Condensing | Non-Condensing | Non-Condensing | Condensing | Condensing | Condensing |
| Capacity | 4.0 Gallons | 8 Gallon | not stated | not stated | 8 Gallon | not stated | not stated |
| Features | not stated | not stated | not stated | WiFi | not stated | not stated | not stated |
| Weight | 52 pounds | 69 pounds | 50 pounds | 40.5 pounds | not stated | 80.9 pounds | 44 pounds |
| Size | Medium | Medium | 8.5 GPM | 9.5 GPM (WiFi) | Medium | 9 GPM | not stated |
| Color | White | No Finish | Silver | Gray | White | Outdoor Installation | White |
| Model | T-H3J-OS-P | T-H3S-OS-P | REU-VE2432WD-US-P | RTG-95XELP-3 | T-H3S-OS-N | RUR160ep | TH3MOSNG |
Frequently asked questions
What is the highest flow rate available in these outdoor propane heaters?
The Rheem RTG-95XELP-3 offers the highest flow rate at 9.5 GPM. This model is designed for high-demand households that need substantial hot water volume. It also includes WiFi connectivity for remote control. The unit weighs 40.5 pounds and measures 13.5 inches in width.
Which propane unit is the most compact for tight outdoor spaces?
The Rinnai RE180eP is the most compact option, measuring 14.1 inches in width and 10.8 inches in length. It weighs only 50 pounds, making it easy to install in confined areas. This non-condensing unit provides a 5.0 GPM flow rate for standard household needs.
Are there efficient condensing models that do not use propane?
Yes, the Takagi T-H3S-OS-N uses natural gas instead of propane. It features condensing venting for high efficiency and emission compliance. The unit maintains a compact footprint similar to its propane counterparts. It is ideal for homes with existing natural gas infrastructure.
How does the weight of the Takagi 8 GPM model compare to the 6.6 GPM version?
The Takagi 8 GPM Propane Outdoor Heater weighs 69 pounds. This is 17 pounds heavier than the 6.6 GPM model, which weighs 52 pounds. Both units share the same height and width dimensions. The weight difference is due to internal components supporting the higher flow rate.
Which heater includes smart features for remote monitoring?
The Rheem RTG-95XELP-3 includes WiFi capabilities for smart control. This allows you to monitor and adjust settings remotely. The unit delivers 9.5 GPM and uses non-condensing venting. It is gray in color and weighs 40.5 pounds, making it a lightweight high-flow option.
What is the largest physical size among these outdoor units?
The Rinnai RUR160ep is the largest unit, measuring 33.9 inches in height and 22.1 inches in length. It weighs 80.9 pounds, which is significantly heavier than other models. This condensing propane heater offers a 9 GPM flow rate but requires more installation space.