Water Heater Recovery Rate

Electric water heater recovery table calculated at 100 recovery efficiency gph recovery at indicated temperature rise.

Water heater recovery rate.

The higher btu burner the better it generally is for recovery. Usually 100 f is used but sometimes 60 f. Beginning with a full tank of hot water a heater with a storage tank can deliver in one hour roughly the number of gallons given as its recovery rate plus about 70 of its tank capacity. Gas fired residential water heaters are generally con sidered to have a 75 recovery efficiency.

They need to be properly ventilated allowing exhaust. The amount of hot water provided will depend on several things. 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. Here s the official definition.

The charts below are based on gallons per hour gph. For a typical 50 gallon electric water heater with dual heating elements a 20 gallons hour recovery rate is good. Wattage of the heating elements burner size efficiency temperature rise required and the time frame used to measure the recovery rate. Recovery rate basically gives you an idea of how fast a water heater can heat water.

The flow rate through the demand water heater would need to be at least 3 25 gallons 12 3 liters per minute. To reduce flow rates install low flow water fixtures. Now knowing the recovery rate of a water heater is important for 2 big reasons. This means 75 of the total heat produced by the burner is absorbed into the water in the tank.

The remaining 25 of the heat is used to move the products of combustion through the flue to the outdoors. The official definition of the recovery time or recovery rate for your water heater is the amount of hot water that your water heater can provide in one hour once it has been completely drained. Calculate the additional load using section vi heater with a recovery rate of 1116 gph 40 f to 140 f and 368 gallons storage. The recovery rate is measured in gallons and basically provides an idea of the speed of your water heater in providing hot water.

The recovery rate is the amount of hot water the water heater is capable of producing in a given period of time. Once the actual hot water flow rate is known the heater can then be selected for the total demand and. To determine temperature rise subtract the incoming water temperature from the desired output temperature.