Water Heater Recovery Rate Calculator

The amount of hot water provided will depend on several things.

Water heater recovery rate calculator. A water heater s first hour rating fhr is the most important feature to consider when purchasing a new heater since it tells you how much hot water the heater can deliver in an hour of use. If you would like the ability to select higher kw amounts please either feel free to get in touch and tell us or use the formula to calculate it. Rise x 1 0 btu input gph x 8 25 x temp. Recovery rate for an electrical heater in a domestic hot water system.

However it can be used to calculate general hot water recovery time for any amount of water. The first hour rating is the number of gallons of hot water the heater can. Sizing storage and heat pump with tank water heaters. Wattage of the heating elements burner size efficiency temperature rise required and the time frame used to measure the recovery rate.

Rise x 1 0 btu hr. 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. Input specific heat btu output gph x 8 25 lbs gal. In an electric water heater if the wattage of the elements is 4500 the incoming water temperature is 40 degrees and you are heating the water to 120 degrees temperature rise of 80 degrees the recovery rate is 23 0 gph.

Various formulas for water heating calculations efficiency gph x 8 25 x temp. Improving commercial kitchen hot water system performance characterized for its maximum hot water use to calculate the peak hot water demand. The above calculator is for calculating hot water recovery time for hot water cylinders. The recovery rate is the amount of hot water the water heater is capable of producing in a given period of time.

Rr hin μ dt ρ p 3413 btu kw dt ρ 3.