Gas Tankless Water Heaters

Start with the fuel available at your home, whether you need an indoor or outdoor model, and how many fixtures may use hot water at the same time. Then compare each model’s published flow performance at your local incoming-water temperature. The best fit is the model sized for your real peak demand and installation conditions.

Both heat water on demand, but they are configured for different fuel supplies. Choose a natural gas model when your home is connected to a natural-gas line, or a propane model when it uses an LP propane supply. Do not interchange fuel types unless the exact model is approved and converted according to its installation instructions.

No. Tankless water heaters are available in gas and electric versions. Gas tankless models use natural gas or propane to heat the water, while most modern gas units also need electrical power for controls, ignition, safety systems, and features such as Wi-Fi.

Choose GPM for the number of showers, faucets, and appliances that may need hot water at once—not for one fixture alone. Incoming-water temperature also matters: colder water requires a greater temperature rise, so the same model can deliver less hot-water flow in colder climates. Review the model’s performance data before selecting a size.

Homes with several bathrooms or frequent simultaneous use generally need more hot-water capacity than a one-bathroom home. Count the fixtures likely to run together and consider climate, desired outlet temperature, and appliance use. A qualified installer can help confirm the right size after checking the home’s gas supply and installation setup.

Indoor models are installed inside the home and require model-specific venting to manage combustion air and exhaust safely. Outdoor models are designed for exterior installation and use a different installation arrangement. Select a unit rated for your planned location and follow its product manual and local code requirements.

In many homes, yes. A tankless water heater is selected by peak hot-water flow and temperature rise rather than tank capacity alone. Before replacing a 50-gallon unit, verify the gas supply, venting or outdoor location, water connections, electrical supply, permits, and local installation requirements.

Most modern gas tankless water heaters need electricity even though gas provides the heat. Electrical power supports the ignition, controls, fan, safety systems, and connected features. Check the exact model’s product page and installation manual for its electrical requirements and outage behavior.

A gas tankless system can have a higher upfront equipment and installation cost than a basic storage-tank water heater. Installation may require the correct gas line, venting, water connections, electrical power, and permits. Available flow can also vary with incoming-water temperature, so accurate sizing is important.

Installation cost varies by home and should be quoted locally. The main factors are the installation location, gas-line capacity, venting route, electrical requirements, water-line changes, permits, and local labor rates. Ask a qualified installer to inspect the site and confirm the work needed for your chosen model.