Simple Calculator Tools

Home All Calculators Advanced Calculators Categories My Tools Our Journey Contact

Home › Home & Garden › Water Heater Recovery Calculator

Water Heater Recovery Calculator

Estimate gallons reheated per hour from heater input and efficiency.

Was this calculator helpful?

Calculator Details

CategoryHome & Garden

Inputs3

UseFree

RunsIn your browser

Before You Calculate

Confirm the value for Heater input (BTU/hr).
Confirm the value for Efficiency (%).
Confirm the value for Temperature rise (u00b0F).

Why You Can Trust It

Calculations run instantly in your browser. Your entries aren't sent to or stored on a server.

Written By

Robert Threadgill
Founder

Founder of Simple Calculator Tools. Builds and tests every calculator on this site personally before publishing.

Heater input (BTU/hr)

Efficiency (%)

Temperature rise (u00b0F)

Result

—

Useful Resources

Search all calculators Browse categories Report a calculator issue

Simple Calculator Tools

Fast, accurate calculators for everyday decisions.

Browse

Categories All Calculators

Company

Our Journey Contact Admin Login

Legal

Privacy Terms

© 2026 Simple Calculator Tools Built to make everyday math easier.