Find Your ThermoMate Water Heater
Step 1
What energy source will power your water heater?
Where will you use hot water most?
How many people will use hot water?
What ZIP code is this for?
ZIP code helps estimate local inlet water temperature, which affects how much hot water flow a tankless unit can realistically deliver.
Personalized recommendation
Your Recommended ThermoMate Water Heaters
Based on your selected power type, usage, household size, and estimated inlet water temperature, these models are the best fit for your needs.
Recommended demand range
Recommended range
120V application notice
Installation Notes
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Frequently Asked Questions
The right size depends on how many fixtures you want to use at the same time, your water temperature needs, your inlet water temperature, and whether you need hot water for a single sink, bathroom, or whole home. For tankless water heaters, GPM and temperature rise are two of the most important sizing factors.
GPM stands for gallons per minute. It measures how much hot water a tankless water heater can deliver at a certain temperature rise. A higher GPM rating usually supports more fixtures or stronger hot water flow.
Electric tankless water heaters are compact and a good choice for homes with sufficient electrical capacity. Gas tankless water heaters are often better for higher hot water demand or whole-home applications, especially when natural gas or propane is already available.
Most 120V point-of-use water heaters are designed for small applications such as handwashing, bathroom sinks, wet bars, or light-duty use. For showers or whole-home hot water, a higher-power 240V electric model or gas tankless water heater is usually required.
Point-of-use water heaters are installed near a specific fixture, such as a sink, to provide faster hot water in one location. Whole-home water heaters are designed to supply hot water to multiple fixtures throughout the house.
Tankless water heaters heat water on demand, so they can provide continuous hot water as long as the unit is properly sized and the flow rate stays within the model’s capacity.
No. Natural gas and propane models are designed for different fuel types. Always choose the correct model for your home’s gas supply and follow the product specifications.
Indoor gas tankless water heaters require proper venting to safely exhaust combustion gases. Venting requirements vary by model and installation setup, so the product manual and local building codes should always be followed.
Many electric tankless water heaters require dedicated breakers, proper wire size, and sufficient electrical service. Before purchasing, confirm that your home’s electrical system can support the model you choose.
Yes. Professional installation is recommended for gas water heaters, high-power electric tankless models, vented systems, and whole-home applications. A qualified installer can help ensure safe setup and proper performance.
