6 Best Alternatives to the ECCOTEMP 6.8 GPM Outdoor Natural Gas Tankless Water Heater (2026)
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The eccotemp 6 8 gpm outdoor natural gas tankless water heater provides a compact, vent-free solution for outdoor use. It delivers 6.8 GPM of hot water and requires no complex venting, making installation straightforward. This model fits well in small to medium homes with existing natural gas lines. Its CSA certification ensures safe operation in the United States and Canada.
You might look for alternatives if you need a higher flow rate for larger households. Some buyers prefer smart app controls or different physical dimensions. Others may want a specific brand reputation or additional safety features. This list includes 6 options that share key specifications with the original unit. All alternatives are natural gas powered and designed for outdoor installation. They overlap with the ECCOTEMP model in fuel type and placement, but vary in flow capacity and size. Review the specs to find the right fit for your hot water demands.
Our top pick: ECCOTEMP 6.8 GPM Outdoor Natural Gas Tankless Water Heater.
How the alternatives compare
Ranein 8.5 GPM Outdoor Natural Gas Water Heater
The Ranein 8.5 GPM Outdoor Natural Gas Water Heater provides a higher flow rate than the ECCOTEMP model. It delivers 8.5 GPM compared to the original 6.8 GPM. This extra capacity suits larger households needing more simultaneous hot water. The unit weighs 44 pounds and measures 15.1 inches wide. It lacks the ECCOTEMP’s explicit CSA certification mention in the provided data. You should choose this if you prioritize maximum flow over the original’s compact 6-inch height. The Ranein is taller at 24.3 inches. It fits outdoor spaces where height is not a constraint. The natural gas fuel type matches the original. This option is best for users who need higher volume output.
APUS 190,000 BTU Outdoor Natural Gas Water Heater
The APUS 190,000 BTU Outdoor Natural Gas Water Heater uses a different dimensional profile than the ECCOTEMP. It is significantly narrower at 6.54 inches wide. The ECCOTEMP is 15 inches wide. This APUS model weighs 42.5 pounds. It offers smart control features via an app, which the ECCOTEMP data does not include. The original model is 6 inches high, while this unit is 22.5 inches high. Both use natural gas and are designed for outdoor installation. The APUS suits buyers who want digital temperature management. The ECCOTEMP relies on physical controls. Choose the APUS if you prefer app-based adjustments. The original remains a simpler, vent-free mechanical option. The APUS provides a modern interface for precise settings.
Rinnai 7.6 GPM Outdoor Natural Gas Water Heater
The Rinnai 7.6 GPM Outdoor Natural Gas Water Heater offers a different balance of flow and size. It provides 7.6 GPM, which is higher than the ECCOTEMP’s 6.8 GPM. The Rinnai model is larger, weighing 53.3 pounds. It measures 14.1 inches wide. The ECCOTEMP is lighter at 38 pounds. The Rinnai includes non-condensing venting specifications in its attributes. The ECCOTEMP requires no venting. This difference affects installation complexity. The Rinnai is taller at 24.6 inches. The original is only 6 inches high. You should pick the Rinnai if you need higher flow and do not mind venting requirements. The ECCOTEMP is better for tight spaces where height matters. The Rinnai provides more hot water volume. It suits homes with greater demand.
Westinghouse 8.1 GPM Outdoor Natural Gas Heater
The Westinghouse 8.1 GPM Outdoor Natural Gas Heater offers higher flow than the ECCOTEMP model. It delivers 8.1 GPM versus 6.8 GPM. The unit is wider at 17.1 inches. The ECCOTEMP is 15 inches wide. The Westinghouse model is also taller at 26.8 inches. It weighs 42 pounds. The original weighs 38 pounds. Both use natural gas for outdoor installation. The Westinghouse focuses on stable temperature control. The ECCOTEMP data does not specify this feature. Choose the Westinghouse if consistent shower temperature is your priority. The original is a simpler mechanical unit. The Westinghouse provides enhanced stability for sensitive users. The ECCOTEMP remains more compact in height. The Westinghouse requires more vertical space. It fits larger outdoor areas.
Rheem RTG 9.5 GPM Outdoor Natural Gas Tankless Heater
The Rheem RTG 9.5 GPM Outdoor Natural Gas Tankless Heater provides the highest flow rate on this list. It delivers 9.5 GPM. This is significantly higher than the ECCOTEMP’s 6.8 GPM. The Rheem unit weighs 39.3 pounds. It is similar in weight to the original. The Rheem model includes WiFi connectivity. The ECCOTEMP data does not list smart features. The Rheem is non-condensing. The ECCOTEMP requires no venting. The Rheem is 13.5 inches wide. The original is 15 inches wide. The Rheem is shorter at 20.8 inches. The ECCOTEMP is 6 inches high. Choose the Rheem if you need maximum flow and smart home integration. The ECCOTEMP is better for simple, vent-free setups. The Rheem suits whole-house demands with high usage.
Rinnai 7.5 GPM Outdoor Natural Gas Tankless Water Heater
The Rinnai 7.5 GPM Outdoor Natural Gas Tankless Water Heater offers moderate flow between the ECCOTEMP and higher-end models. It provides 7.5 GPM. This exceeds the ECCOTEMP’s 6.8 GPM. The Rinnai unit is much taller at 35 inches. The ECCOTEMP is only 6 inches high. The Rinnai is 14.5 inches wide. The original is 15 inches wide. The Rinnai weighs 22 pounds more than the original. Both use natural gas for outdoor use. The Rinnai is designed for large households. The ECCOTEMP fits smaller spaces. Choose the Rinnai if you have ample vertical space and need higher flow. The ECCOTEMP is better for compact installations. The Rinnai provides more hot water volume. It suits homes with multiple bathrooms.
Quick picks
Our 7 picks
ECCOTEMP 6.8 GPM Outdoor Natural Gas Tankless Water Heater
Best for: compact outdoor installations with gas access
- Fuel Type
- Natural Gas
- Flow Rate
- 6.8 GPM
- Installation Location
- Outdoor
- Certification
- CSA Certified for US and Canadian use
- Dimensions
- 6 x 15 x 22 inches
- Weight
- 38 pounds
View on Amazon: ECCOTEMP 6.8 GPM Outdoor Natural Gas Tankless Water Heater Affiliate link
The ECCOTEMP 45H-NG is a 6.8 GPM outdoor natural gas tankless water heater. It measures 6 x 15 x 22 inches and weighs 38 pounds. This unit is CSA Certified for US and Canadian use. It requires no venting for installation. The compact design saves indoor space. It suits homes needing efficient hot water without complex ductwork.
Pros
- 6.8 GPM flow rate for whole-home use
- CSA Certified for US and Canadian safety standards
- No venting required for easy outdoor installation
- Compact 6 x 15 x 22 inch footprint
Cons
- Lower 6.8 GPM flow rate than 8.5 to 9.5 GPM competitors
- Outdoor-only installation limits placement options
- Natural gas fuel type requires existing gas line
Good fit if
- You need a compact outdoor unit for a home or apartment
- You want CSA Certified safety for US or Canadian use
- You prefer no-venting installation to save space
Skip if
- You need a higher flow rate above 7 GPM
- You require an indoor installation option
- You do not have a natural gas supply
Verdict: ECCOTEMP 6.8 GPM Outdoor Natural Gas Heater fits small to medium homes needing a compact, vent-free outdoor solution. It offers reliable CSA Certified performance for users with existing gas lines.
Ranein 8.5 GPM Outdoor Natural Gas Water Heater
Best for: High-flow outdoor needs under 2,000 feet
- Fuel Type
- Natural Gas
- Flow Rate
- 8.5 GPM
- BTU
- 190,000 BTU
- Installation Location
- Outdoor
- Dimensions
- 24.3 x 15.1 x 15.1 in
- Weight
- 44 pounds
View on Amazon: Ranein 8.5 GPM Outdoor Natural Gas Water Heater Affiliate link
The Ranein RHO19K-NG delivers 8.5 GPM of hot water at 190,000 BTU for outdoor use. Its compact 24.3 x 15.1 x 8.1-inch frame fits tight spaces. The bottom-mounted fan adjusts to wind pressure for safe combustion. Anti-freeze protection prevents internal damage in cold weather. It suits families needing high flow for multiple outlets.
Pros
- 8.5 GPM flow rate for whole-family use
- 190,000 BTU heating capacity
- Anti-freeze protection included
- Bottom-mounted fan for safety and wind adjustment
Cons
- Not recommended for elevations over 2,000 feet
- Requires manual draining in cold weather if unused
- No digital display mentioned in specifications
Good fit if
- You need high flow for 4-6 outlets
- You install outdoors in mild climates
- You want a compact unit under 45 pounds
Skip if
- You live above 2,000 feet elevation
- You need indoor installation
- You require automatic freeze prevention
Verdict: Ranein 8.5 GPM Outdoor Natural Gas Heater offers high capacity for large households outdoors. It fits buyers who prioritize flow rate over elevation flexibility.
APUS 190,000 BTU Outdoor Natural Gas Water Heater
Best for: High-flow outdoor needs with app control
- Fuel Type
- Natural Gas
- Flow Rate
- 8.1 GPM
- BTU
- 190,000 BTU
- Installation Location
- Outdoor
- Voltage
- 120V AC
- Temperature Control
- 95°F–149°F, ±1°F
View on Amazon: APUS 190,000 BTU Outdoor Natural Gas Water Heater Affiliate link
The APUS 190,000 BTU unit delivers 8.1 GPM of instant hot water for outdoor use. It features a compact 22.5-inch height and supports five to six simultaneous fixtures. You can control temperature precisely via the Tuya app or a wired controller. The unit maintains a stable ±1°F accuracy. It includes a 2-year full warranty on all components.
Pros
- 8.1 GPM flow rate for whole-home supply
- Smart temperature control via Tuya app
- Ultra-low 0.79 GPM minimum flow requirement
- Oxygen-free copper heat exchanger
Cons
- 2-year warranty is shorter than industry standards
- Requires 120V AC power connection
- App control requires third-party Tuya software
Good fit if
- You need high flow for multiple fixtures
- You want precise app-based temperature control
- You have weak water pressure
Skip if
- You need a longer warranty period
- You require a wired-only control interface
- You are installing indoors
Verdict: APUS 190k BTU Outdoor Natural Gas Heater suits users needing high flow and smart control. It is ideal for outdoor setups with weak water pressure.
Rinnai 7.6 GPM Outdoor Natural Gas Water Heater
Best for: compact outdoor installations with moderate flow needs
- 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 compact, non-condensing outdoor unit delivering 7.6 GPM of hot water for natural gas. Its small footprint fits tight spaces while supporting up to six simultaneous fixtures. The LED screen displays error codes and service reminders. You get a 15-year heat exchanger warranty with registration. This model suits homes needing reliable outdoor performance without the bulk of larger condensing systems.
Pros
- 7.6 GPM flow rate supports six fixtures
- Compact dimensions: 24.6 x 14.1 x 10.8 inches
- 15-year limited heat exchanger warranty
- LED screen shows error codes and reminders
Cons
- Lower flow rate than competitors offering 8.5 to 9.5 GPM
- WiFi control module sold separately
- Professional installation required for warranty validity
Good fit if
- You need a compact unit for tight outdoor spaces
- You want a trusted brand with strong warranty coverage
- You have a single bathroom or light multi-fixture use
Skip if
- You require high flow rates above 8 GPM
- You prefer built-in WiFi connectivity
- You need a condensing unit for higher efficiency
Verdict: Rinnai RE199eN 7.6 GPM Outdoor Natural Gas fits buyers prioritizing compact size and warranty protection over maximum flow rate. It is ideal for small households with moderate hot water demands.
Westinghouse 8.1 GPM Outdoor Natural Gas Heater
Best for: stable outdoor shower temperature control
- Fuel Type
- Natural Gas
- Flow Rate
- 8.1 GPM
- BTU
- 180,000 BTU
- Installation Location
- Outdoor
- Voltage
- 120V AC
- Temperature Control
- 95–158°F, ±1°F
View on Amazon: Westinghouse 8.1 GPM Outdoor Natural Gas Heater Affiliate link
This outdoor unit delivers 8.1 GPM and 180,000 BTU of natural gas heating. It maintains temperature within ±1°F using self-modulating technology. The 42-pound, CSA-certified design includes freeze protection and a variable-speed fan. It supports 3–5 fixtures at once. You should choose this if you need whole-home hot water outdoors with stable temperature control.
Pros
- 8.1 GPM flow rate for multiple fixtures
- ±1°F temperature stability with self-modulating tech
- 180,000 BTU heating capacity
- CSA certified for outdoor safety
- Integrated freeze protection
Cons
- Shorter 2-year unit warranty than competitors
- Heavier 42-pound build
- Lower 8.1 GPM flow rate than top alternatives
Good fit if
- You need stable temperature control for outdoor showers
- You want CSA-certified safety for outdoor use
- You require freeze protection for year-round operation
Skip if
- You need flow rates above 9 GPM
- You want a longer than 2-year unit warranty
- You prefer a lighter unit under 40 pounds
Verdict: Westinghouse 8.1 GPM Outdoor Natural Gas Heater offers precise temperature stability and outdoor safety, making it a solid choice for buyers prioritizing consistent shower performance over maximum flow rate.
Rheem RTG 9.5 GPM Outdoor Natural Gas Tankless Heater
Best for: high-flow whole-house outdoor use
- 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 delivers 9.5 GPM at a 35°F rise, powered by 199,900 BTUs. This outdoor, non-condensing unit features a ±1°F digital LED control and 0.82 UEF. It suits large homes needing high flow. The durable metal cabinet supports wall mounting. Professional installation is required for this natural gas model.
Pros
- 9.5 GPM flow rate for multiple showers
- 199,900 BTU/hr output
- ±1°F temperature precision
- 0.82 Uniform Energy Factor
Cons
- Requires professional installation
- No WiFi connectivity in this specific model
- Outdoor installation only
Good fit if
- You need high flow for a large family
- You want precise temperature control
- You have outdoor venting space
Skip if
- You require indoor installation
- You want built-in WiFi
- You need a smaller unit
Verdict: Rheem RTG-95XLN 9.5 GPM Natural Gas offers the highest flow rate on this list for whole-house demands. It fits buyers who prioritize volume over smart features.
Rinnai 7.5 GPM Outdoor Natural Gas Tankless Water Heater
Best for: Large households needing high flow
- Fuel Type
- Natural Gas
- Flow Rate
- 7.5 GPM
- Installation Location
- Outdoor
- Dimensions
- 35 x 14.5 x 22 inches
View on Amazon: Rinnai 7.5 GPM Outdoor Natural Gas Tankless Water Heater Affiliate link
The Rinnai RUS75eN delivers a 7.5 GPM flow rate for up to six simultaneous appliances. It uses natural gas and is designed for outdoor installation. The unit measures 35 by 14.5 by 22 inches. It offers flexible venting options, including PVC or CPVC. This heater suits large households needing high-volume hot water. The compact design conserves space while providing endless hot water.
Pros
- 7.5 GPM flow rate serves up to six appliances
- Outdoor installation design for space efficiency
- Flexible venting with PVC/CPVC options
- 12-year heat exchanger warranty
Cons
- Larger footprint than 6.8 GPM models
- Professional installation required
- Only 1-year labor warranty
Good fit if
- You need high flow for multiple bathrooms
- You have outdoor mounting space
- You want flexible venting options
Skip if
- You need indoor installation
- You prefer DIY setup
- You want a smaller unit
Verdict: Rinnai RUS75eN 7.5 GPM Outdoor Natural Gas fits large homes needing high flow. It suits those with outdoor space and flexible venting needs.
Specifications side by side
| Spec | ECCOTEMP 6.8 GPM Outdoor Natural Gas Tankless Water Heater | Ranein 8.5 GPM Outdoor Natural Gas Water Heater | APUS 190,000 BTU Outdoor Natural Gas Water Heater | Rinnai 7.6 GPM Outdoor Natural Gas Water Heater | Westinghouse 8.1 GPM Outdoor Natural Gas Heater | Rheem RTG 9.5 GPM Outdoor Natural Gas Tankless Heater | Rinnai 7.5 GPM Outdoor Natural Gas Tankless Water Heater |
|---|---|---|---|---|---|---|---|
| Fuel Type | Natural Gas | Natural Gas | Natural Gas | Natural Gas | Natural Gas | Natural Gas | Natural Gas |
| Flow Rate | 6.8 GPM | 8.5 GPM | 8.1 GPM | 9.8 GPM | 8.1 GPM | 9.5 GPM | 7.5 GPM |
| BTU | not stated | 190,000 BTU | 190,000 BTU | 199k BTU | 180,000 BTU | 199,900 BTU/hr | not stated |
| Installation Location | Outdoor | Outdoor | Outdoor | Outdoor | Outdoor | Outdoor | Outdoor |
| Voltage | not stated | not stated | 120V AC | not stated | 120V AC | not stated | not stated |
| Temperature Control | not stated | not stated | 95°F–149°F, ±1°F | not stated | 95–158°F, ±1°F | ±1°F | not stated |
| Certification | CSA Certified for US and Canadian use | not stated | not stated | not stated | CSA | CSA | not stated |
| Dimensions | 6 x 15 x 22 inches | 24.3 x 15.1 x 15.1 in | 22.48 × 15.51 × 6.54 in | 24.6 x 14.1 x 10.8 in | 26.8 x 17.1 x 17.1 inches | 20.8 x 13.5 x 9.4 inches | 35 x 14.5 x 22 inches |
| Use | not stated | not stated | not stated | not stated | Whole House | not stated | not stated |
| Venting Type | not stated | not stated | not stated | Non-Condensing | not stated | Non-Condensing | not stated |
| Features | not stated | not stated | not stated | not stated | not stated | WiFi | not stated |
| Weight | 38 pounds | 44 pounds | 42.5 pounds | 53.3 pounds | 42 pounds | 39.3 pounds | not stated |
| Size | 6.8 GPM | 8.5 GPM Outdoor | not stated | 9.8 GPM | not stated | 9.5 GPM (No WiFi) | 7.5 GPM |
| Color | White | Gray-NG | Gray | Silver | Grey 81NO | Gray | Outdoor Installation |
| Model | 45H-NG | RHO19K-NG | AP-AWH-W26NG | REU-VE2737WD-US-N | HS180A0G-NG | RTG-95XLN-3 | RUS75eN |
You can compare overall flow rate performance among the best natural gas tankless water heaters.
Frequently asked questions
Is the ECCOTEMP 6.8 GPM unit suitable for whole-house use?
It fits small to medium homes. The 6.8 GPM flow rate supports multiple fixtures but may struggle with simultaneous high-demand usage in larger households. For greater capacity, consider the Rheem RTG 9.5 GPM model. It delivers the highest flow rate on this list, making it better for whole-house demands where volume is the priority.
Does this heater require complex venting?
No, it is a vent-free outdoor unit. This design simplifies installation by eliminating the need for complex venting systems. You only need access to a natural gas line and an outdoor space. Other models like the Rinnai RE199eN are also non-condensing and outdoor-ready, offering similar installation ease with different flow capabilities.
What are the dimensions of the ECCOTEMP 6.8 GPM heater?
The unit measures 22 inches in length, 15 inches in width, and 6 inches in height. It weighs 38 pounds. Its compact profile makes it easy to mount in tight outdoor areas. If you need a wider footprint, the Ranein model is 15.1 inches square but taller at 24.3 inches.
Can I control the temperature via an app?
The ECCOTEMP model does not list app control in its specifications. However, the APUS 190,000 BTU Outdoor Natural Gas Water Heater includes smart control features. This allows you to manage settings remotely, which is useful for outdoor setups with weak water pressure or when adjusting temperatures from a distance.
Which alternative offers the best flow rate?
The Rheem RTG 9.5 GPM Outdoor Natural Gas Tankless Heater offers the highest flow rate. It delivers 9.5 GPM, making it ideal for high-demand whole-house use. The Ranein 8.5 GPM model is another strong option for large households. It provides significant capacity, though it prioritizes flow over elevation flexibility.
Is there a model with precise temperature stability?
The Westinghouse 8.1 GPM Outdoor Natural Gas Heater focuses on stable temperature control. It provides consistent shower performance, which is valuable for comfort. While the ECCOTEMP model offers reliable CSA Certified performance, the Westinghouse unit is specifically noted for its precise temperature stability and outdoor safety features.
Which heater is best for compact outdoor installations?
The ECCOTEMP 6.8 GPM fits small to medium homes needing a compact solution. It is 6 inches high and 15 inches wide. The Rinnai RE199eN is also designed for compact outdoor installations. It prioritizes size and warranty protection over maximum flow rate, making it suitable for small households with moderate hot water demands.
Does the Rheem model include WiFi connectivity?
Yes, the Rheem RTG 9.5 GPM model includes WiFi features. This allows for remote monitoring and control. The product data notes a version without WiFi as well. If you prioritize smart connectivity alongside high flow, this model stands out compared to the ECCOTEMP, which lacks mentioned digital features.