ThermoMate Tankless Water Heaters
Tankless Water Heaters
Shop ThermoMate tankless water heaters for endless hot water on demand. Choose from electric, propane, and natural gas models designed for point-of-use, whole-home, RV, cabin, and off-grid applications.
Tankless Water Heater Buying Guide
Find the Right Tankless Water Heater for Your Home
ThermoMate tankless water heaters are designed to deliver hot water on demand while saving space and improving energy efficiency. Whether you need an electric model for point-of-use installation, a propane unit for cabins or off-grid living, or a natural gas tankless water heater for whole-home use, this guide can help you choose the right option.
Shop by Fuel Type
Electric Tankless Water Heaters
Ideal for under-sink use, bathrooms, apartments, small homes, and selected whole-house applications. Electric models are compact, efficient, and do not require gas venting.
Shop Electric ModelsPropane Tankless Water Heaters
A great choice for cabins, RVs, outdoor showers, rural homes, and off-grid living where natural gas is not available.
Shop Propane ModelsNatural Gas Tankless Water Heaters
Designed for homes with an existing natural gas line and higher hot water demand. A practical option for whole-house hot water supply.
Shop Natural Gas ModelsShop by Application
Point of Use
Best for sinks, bathrooms, kitchens, garages, and locations where you need hot water close to the fixture.
Whole House
Suitable for homes that need continuous hot water for multiple fixtures, showers, and daily household use.
RV, Cabin & Off-Grid
Propane models are often preferred for mobile, remote, and outdoor hot water applications.
Apartment & Small Home
Compact electric models can help save space while providing efficient hot water for everyday needs.
Electric vs Propane vs Natural Gas Tankless Water Heaters
How to Choose the Right Tankless Water Heater
When choosing a tankless water heater, consider your fuel source, installation location, number of fixtures, desired flow rate, and temperature rise. For point-of-use applications such as sinks or small bathrooms, a compact electric tankless water heater may be enough. For whole-home hot water, larger electric models or gas tankless water heaters may be more suitable.
If your home already has a natural gas line, a natural gas tankless water heater can be a strong option for continuous household hot water. If you need hot water for a cabin, RV, outdoor shower, or off-grid location, a propane tankless water heater may be the better fit.
Tankless Water Heater FAQ
What size tankless water heater do I need?
The right size depends on your hot water demand, flow rate, temperature rise, and number of fixtures used at the same time. A small point-of-use model may work for one sink, while whole-house applications usually require a larger electric or gas model.
Can a tankless water heater supply a whole house?
Yes. Many tankless water heaters are designed for whole-house use, but the right model depends on your household size, number of bathrooms, incoming water temperature, and fuel source.
Is electric or gas tankless better?
Electric tankless water heaters are compact and do not require gas venting, making them ideal for many indoor and point-of-use applications. Gas tankless water heaters are often preferred for higher hot water demand or whole-house use.
Do propane and natural gas tankless water heaters need venting?
Most indoor gas tankless water heaters require proper venting for safe operation. Always follow the product manual and local installation codes.
Are tankless water heaters energy efficient?
Tankless water heaters heat water only when needed, which helps reduce standby energy loss compared with traditional storage tank systems.