Water Heater Recovery Rate Calculator

Wattage of the heating elements burner size efficiency temperature rise required and the time frame used to measure the recovery rate.

Water heater recovery rate calculator.

Rise x 1 0 btu hr. Input specific heat btu output gph x 8 25 lbs gal. 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. 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.

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. The recovery rate is the amount of hot water the water heater is capable of producing in a given period of time. Take a minute to calculate the amount of hot water your household needs on the busiest one hour period of time of any average day. California flow rate guidelines of fixtures 5 for use in sizing storage and recovery rate requirement of the water heater can be reduced from 445 to 340 gph.

Improving commercial kitchen hot water system performance characterized for its maximum hot water use to calculate the peak hot water demand. Rr hin μ dt ρ p 3413 btu kw dt ρ 3. Rise x 1 0 btu input gph x 8 25 x temp. The first hour rating is the number of gallons of hot water the heater can.

Sizing storage and heat pump with tank water heaters. The above calculator is for calculating hot water recovery time for hot water cylinders. Various formulas for water heating calculations efficiency gph x 8 25 x temp. The amount of hot water provided will depend on several things.

However it can be used to calculate general hot water recovery time for any amount of water.