Independent water heater research and comparisonExplore the installer directory
Water Heater System GuideFind a Local Pro

Water heater tool

Hot-Water Demand Planner

Add simultaneous fixtures and fixture counts to estimate total hot-water GPM demand for a sizing conversation.

Screening estimate only.This worksheet uses only the values you enter. A licensed plumber's sizing, code review, and installation plan are authoritative.

Fixture demand planner

Add simultaneous fixtures

Select fixtures that may run at the same time, enter counts, and use the suggested GPM as a starting point for installer quotes.

Total simultaneous demand appears here.Change fixture selections or counts to update the plan.

Source note: ENERGY STAR lists average fixture flows of 2.5 GPM for a shower or bathtub, 3.3 GPM for a clothes washer, 2.2 GPM for a kitchen or bathroom sink, and 1.3 GPM for a dishwasher.ENERGY STAR tankless source