Water Heater Recovery Rate

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.

Water heater recovery rate.

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. To reduce flow rates install low flow water fixtures. The charts below are based on gallons per hour gph. Calculate the additional load using section vi heater with a recovery rate of 1116 gph 40 f to 140 f and 368 gallons storage.

To determine temperature rise subtract the incoming water temperature from the desired output temperature. Gas fired residential water heaters are generally con sidered to have a 75 recovery efficiency. The flow rate through the demand water heater would need to be at least 3 25 gallons 12 3 liters per minute. Electric water heater recovery table calculated at 100 recovery efficiency gph recovery at indicated temperature rise.

For a typical 50 gallon electric water heater with dual heating elements a 20 gallons hour recovery rate is good. This means 75 of the total heat produced by the burner is absorbed into the water in the tank. The recovery rate is the amount of hot water the water heater is capable of producing in a given period of time. Recovery rate basically gives you an idea of how fast a water heater can heat water.

The higher btu burner the better it generally is for recovery. Here s the official definition. Wattage of the heating elements burner size efficiency temperature rise required and the time frame used to measure the recovery rate. Usually 100 f is used but sometimes 60 f.

The amount of hot water provided will depend on several things. For a typical 40 to 50 gallon gas water heater anything above 40 gallons hour would be considered a good recovery rate. A water heater s recovery time also called recovery rate is the amount of hot water in gallons a tank water heater can provide in just one hour after being completely drained. They need to be properly ventilated allowing exhaust.

Now knowing the recovery rate of a water heater is important for 2 big reasons. The remaining 25 of the heat is used to move the products of combustion through the flue to the outdoors. Gas water heaters have a quicker recovery time about 50 gallons per hour compared to around 14 gallons per hour of an electric water heater.