Calculate water heater recovery rate, gallons per hour, heat-up time, BTU input, kilowatt input, temperature rise, and tank recovery capacity. Use this for tank water heaters, electric water heaters, gas water heaters, and hot water system planning.
Recovery rate:
The calculator estimates gallons per hour from heat input, efficiency, and temperature rise.
Heat-up time:
The calculator estimates how long it takes to heat the tank or replace used hot water.
BTU input needed:
The calculator estimates required BTU/hr or kW to recover a certain amount of hot water in a target time.
Capacity check:
The calculator compares known recovery rate against peak hot water demand.
A water heater recovery rate calculator helps estimate how quickly a tank water heater can reheat after hot water is used.
It can help compare BTU input, kW input, temperature rise, tank size, hot water used, recovery time, and recovery capacity margin.
Your result shows estimated recovery rate, heat-up time, BTU input need, kW input need, and recovery margin. This is a planning estimate only. Final water heater performance should be checked against the manufacturer’s recovery rating, fuel type, thermostat setting, heater efficiency, standby loss, and actual incoming water temperature.
Water heater recovery rate is how many gallons of water the heater can raise to the desired temperature in one hour.
Heat input, heater efficiency, tank size, incoming water temperature, target hot water temperature, and fuel type all affect recovery rate.
Multiply BTU/hr input by efficiency, then divide by 8.34 times the temperature rise.
No. This calculator gives a planning estimate. Final performance should be checked with the manufacturer’s rated recovery and first hour rating.