ECCOTEMP 45H-NG 6.8 GPM Outdoor Natural Gas Tankless Water Heater Review (2026): A Spec-Based Look
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The eccotemp 45h ng 6 8 gpm outdoor natural gas tankless water heater is a compact unit designed for exterior mounting. It delivers a maximum flow rate of 6.8 gallons per minute using natural gas. This model measures just 6 by 15 by 22 inches, allowing it to fit in tight spaces without taking up valuable indoor square footage. It is CSA Certified for use in both the US and Canada. The unit activates only when water is flowing, which helps reduce energy waste. You get a straightforward installation process that does not require venting.
What stands out
- 6.8 GPM flow rate for simultaneous use
- No venting required for quick setup
- CSA Certified for US and Canadian safety
- Compact 6 x 15 x 22 inch footprint
- Includes T&P relief valve and gas shut-off
Who it fits
Good fit for
This heater suits homeowners with outdoor access who need a reliable source of hot water for multiple fixtures. The 6.8 GPM output is strong enough for a whole home setup, including showers and kitchen sinks running at the same time. If you want to save indoor space and avoid complex venting work, this outdoor model is a practical choice. It is also a good fit for apartments or townhomes where exterior wall mounting is permitted. The natural gas fuel type ensures consistent performance without electric constraints.
Who should skip it
You should look at another option if you live in a region without natural gas service, as this unit is not compatible with propane. It is also not suitable for indoor installation because it lacks the necessary venting components and is rated for outdoor use only. If you need a higher flow rate than 6.8 GPM, this model may not keep up with heavy demand. Additionally, if you prefer a digital display or remote control features, this basic mechanical unit does not include them. Check your local codes before mounting it outside.
Verdict: The ECCOTEMP 6.8 GPM Outdoor Natural Gas Tankless Water Heater offers a space-saving, vent-free solution for homes with natural gas. Its certified safety and strong flow rate make it a solid choice for outdoor whole-home heating.
Key specs explained
Flow Rate: 6.8 GPM
This unit delivers up to 6.8 gallons of hot water per minute. This flow rate supports multiple simultaneous uses, such as a shower and a kitchen sink. You can expect adequate pressure for most whole-home applications. Compare this number with other models to ensure it meets your peak demand needs without temperature drops.
Fuel Type: Natural Gas
This heater runs on natural gas rather than propane or electricity. You must have an existing natural gas line to connect to the unit. Natural gas typically offers higher flow rates than electric models. Verify your home infrastructure supports this fuel type before purchasing to avoid costly installation changes.
Installation Location: Outdoor
This model is designed specifically for exterior mounting. It saves indoor space and simplifies venting requirements since no flue is needed. You must place it in a protected area to prevent weather damage. Indoor units require different venting, so this spec dictates where you can physically install the device.
Dimensions: 6 x 15 x 22 inches
The compact footprint measures six inches deep, fifteen inches wide, and twenty-two inches tall. This size fits easily into tight outdoor corners or utility areas. You should measure your intended mounting space to ensure clearance for connections. Smaller units offer easier installation in constrained locations compared to bulkier indoor tanks.
Certification: CSA Certified for US and Canadian use
CSA certification indicates the unit meets specific safety and performance standards in North America. This approval ensures the electrical and gas components are safe for residential use. You can trust this mark as a baseline for quality and compliance. Always verify certification for your region when buying heating equipment.
Design and Build Quality
The unit measures 6 by 15 by 22 inches and weighs 38 pounds. This compact footprint allows for flexible exterior placement. You can mount it on a side wall or in a utility area without consuming significant indoor space. The white finish is listed in the specifications. This color choice helps the unit blend into most outdoor environments while resisting weather exposure.
According to the listing, the model is CSA Certified for use in both the US and Canada. This certification indicates that the build meets specific safety standards for gas appliances. The design includes a Temperature and Pressure Relief Valve and a Gas Shut-Off Valve. These components are integrated into the unit for safety compliance. You also get 3/4 inch NPT fittings for connecting your plumbing lines.
The outdoor installation location is a key design feature. You do not need to vent this model, which simplifies the physical setup. The compact and quiet operation means you will barely notice it is there. This layout is ideal for apartments or townhomes where interior space is limited. The natural gas fuel type requires a gas line connection. You must ensure your exterior location has access to a natural gas supply for proper operation.
Setup and Everyday Use
Installing this unit requires an outdoor location, as the design does not support indoor mounting. The compact dimensions of 6 by 15 by 22 inches allow for flexible placement on exterior walls. You do not need to install a venting system, which simplifies the setup process significantly. The unit includes 3/4-inch NPT fittings, so you will need compatible piping for your natural gas line and water connections. It also comes with a temperature and pressure relief valve and a gas shut-off valve, ensuring safety during operation. The CSA certification confirms it meets safety standards for use in the United States and Canada. Because it is designed for outdoor use, you must ensure the mounting area is protected from direct exposure to harsh weather elements that could damage the components. Daily use begins when you turn on a hot water tap. The system activates only when water is flowing, which conserves energy by not maintaining a stored tank of hot water. The 6.8 GPM flow rate supports multiple fixtures running simultaneously, such as a shower and a kitchen sink. The unit operates quietly, so you will barely notice it running in the background. Its small footprint means it takes up minimal space, making it suitable for tight utility areas or side yards. You simply connect the gas and water lines, and the heater provides on-demand hot water whenever needed. This practical design ensures efficient performance without complex maintenance routines.
Before You Buy This Heater
You need to verify your gas line size matches the unit’s 3/4-inch NPT fittings before starting. This model requires a dedicated outdoor location, so ensure the mounting spot is protected from direct weather exposure where possible. Since it lacks indoor venting, you must confirm local codes allow exterior placement in your specific area. The unit comes with a temperature and pressure relief valve and a gas shut-off valve, which simplifies the initial setup. You should still plan for professional installation to handle the gas connection safely. Regular maintenance involves checking for debris around the intake and ensuring the exterior components remain clean. This 6.8 GPM model fits well if you need high flow for multiple bathrooms. It suits larger households better than lower-flow competitors. Compare its outdoor-only design against indoor units if space is tight. The CSA certification ensures it meets safety standards for both US and Canadian markets. Keep these practical steps in mind before purchasing.
Check before you buy
- Confirm your gas line matches the 3/4-inch NPT fittings.
- Ensure you have a suitable outdoor mounting location.
- Check local codes for exterior tankless heater installation.
- Verify the unit fits your whole-home flow needs.
The product at a glance
ECCOTEMP 6.8 GPM Outdoor Natural Gas Tankless Water Heater
Best for: outdoor whole-home natural gas hot water
- 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
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The ECCOTEMP 45H-NG is a whole-home, outdoor tankless water heater powered by natural gas. It delivers 6.8 GPM and measures 6 x 15 x 22 inches. This CSA-certified unit requires no venting, saving indoor space. It includes a temperature and pressure relief valve, a gas shut-off valve, and 3/4" NPT fittings for installation. It suits homes needing efficient, outdoor hot water solutions.
Pros
- Delivers 6.8 GPM flow rate for whole-home use
- CSA Certified for safe installation in US and Canada
- No venting required for quick, hassle-free setup
- Compact outdoor design saves indoor space
Cons
- Outdoor installation only; not suitable for indoor use
- Requires professional natural gas connection and fittings
- Limited to natural gas fuel type only
Good fit if
- You need a whole-home hot water solution for an outdoor setting
- You want to save indoor space by installing the unit outside
- You prefer a vent-free installation process
Skip if
- You need an indoor installation option
- You require propane or electric fuel sources
- You need a unit for a single fixture only
Verdict: ECCOTEMP 6.8 GPM Outdoor Natural Gas Heater is a practical choice for homeowners needing high-flow, outdoor hot water without venting constraints. It fits those prioritizing space savings and certified safety for natural gas setups.
Specifications side by side
| Spec | ECCOTEMP 6.8 GPM Outdoor Natural Gas Tankless Water Heater |
|---|---|
| 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 |
| Size | 6.8 GPM |
| Color | White |
| Model | 45H-NG |
Frequently asked questions
Can I install the ECCOTEMP 45H-NG indoors?
No, this unit is designed strictly for outdoor installation. The specifications list the installation location as outdoor only. Indoor mounting is not supported due to safety and ventilation requirements for natural gas appliances. You must place this heater on an exterior wall to ensure proper operation and compliance with safety standards.
What are the physical dimensions of this water heater?
The ECCOTEMP 45H-NG measures 6 inches in height, 15 inches in width, and 22 inches in length. Its compact footprint allows for flexible mounting on exterior walls. The unit weighs 38 pounds, which is manageable for standard installation brackets. These dimensions help you plan the available space on your home's exterior.
Does this model require a venting system?
No, this outdoor natural gas unit does not require a venting system. It is designed to operate safely in exterior environments without complex exhaust ductwork. This simplifies the installation process compared to indoor models. You only need to connect the gas line and water lines to the appropriate fittings.
What fuel type does the ECCOTEMP 45H-NG use?
This heater uses natural gas as its fuel source. It is not compatible with propane unless specifically converted by the manufacturer, which is not indicated in the standard specifications. You must have a natural gas supply line available at the installation site. Ensure your gas pressure matches the unit's requirements before connecting.
How much hot water can this unit produce per minute?
The ECCOTEMP 45H-NG delivers up to 6.8 gallons of hot water per minute. This flow rate supports multiple simultaneous uses, such as a shower and a kitchen sink. It is suitable for whole-home applications in smaller households. The actual output depends on the incoming water temperature and flow settings.
Is the ECCOTEMP 45H-NG suitable for outdoor use?
Yes, this model is built specifically for outdoor installation. It is rated for exterior mounting and can withstand outdoor environmental conditions. The design allows for placement on side walls or in utility areas outside. You should still ensure the mounting spot is protected from direct weather exposure where possible for longevity.
What is the weight of the ECCOTEMP 45H-NG?
The unit weighs 38 pounds. This weight is manageable for standard installation brackets but requires secure mounting on a sturdy exterior wall. The compact size of 6 by 15 by 22 inches helps distribute this weight effectively. Ensure your wall can support this load before beginning the installation process.