Incoming water can be as low as 37°F, requiring a high temperature rise (approx. 83°F).

Lowe's offers three primary power options, which you can browse on the Lowe's Tankless Water Heaters page . How to Choose a Tankless Water Heater | Lowe's

A unit rated for 7 GPM in Florida might only deliver 3 GPM in Maine because it must heat the water more intensely. 3. Choose a Power Source

Unlike tank models measured in gallons, tankless units are sized by , measured in gallons per minute (GPM). To find your size, add up the GPM of every fixture you plan to use at the same time . Typical Fixture Average Flow Rate (GPM) Kitchen Faucet 1.0 – 2.0 GPM Showerhead 2.0 – 3.0 GPM Dishwasher 1.0 – 2.0 GPM Washing Machine 1.5 – 2.5 GPM Source: Lowe's Buying Guide 2. Calculate Temperature Rise

A tankless water heater is a space-saving, energy-efficient upgrade that provides hot water on demand rather than storing it in a tank. When shopping at Lowe's, selecting the right unit depends on matching its capacity to your household's peak water usage and local climate.

Incoming water may be 70°F+, meaning the unit works less to reach 120°F.