Water Heater Btu Chart

The first hour rating is the number of gallons of hot water the heater can supply per hour starting with a tank full of hot water.

Water heater btu chart. Since btu ratings on heaters are per hour multiply by 60 60 minutes in an hour for btu s per hour per gallon per minute. Please remember that the calculators above assume 100 conversion efficiency. For tankless water heaters the key criterion is hot water flow rate. This gives the amount of energy required to heat the water assuming a 100 efficient heater.

A btu is a relatively small amount of energy. To properly size a storage water heater for your home including a heat pump water heater with a tank use the water heater s first hour rating. Heating btu calculator when shopping for heaters many people make the mistake of choosing the wrong size for their actual needs. A btu is an abbreviation for b ritish t hermal u nit which is the amount of energy required to raise 1 pound of water 1 degree fahrenheit at sea level.

About equivalent to the heat generated by striking 1 stick match. Given all the different options available for heaters space vented gas console and more narrowing down the choices can be a great way to ensure that you are choosing the best option. That is a water heater in the north either tank or tankless will need a higher btu input in the winter than the summer to heat and deliver water to a given temperature. Tankless water heater sizing calculator.

Btu calculator btu formulas for water circulating heat transfer. Incoming water temperature is a critical consideration which varies by region and season.