Domestic Hot Water Storage Tank Sizing

Design of domestic service water supply systems introduction to general design of domestic service water supply systems with pressurized or gravity tanks.

Domestic hot water storage tank sizing. Water systems hot and cold water service systems design properties capacities sizing and more. D is your dump load in gph. 45 litres of hot water for a 5 minute shower. It depends on the tank capacity source of heat burner or element and the size of the burner or element.

Customer support find a watts distributor. The potable water expansion tank shall be installed in the cold water service pipe line on the supply side of the water heater or water storage tank. 50 100 litres of hot water for a full load in the washing machine12 20 litres of hot water per cycle in the dishwasher. C is the capacity of the water tank in gallons.

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 this example you will need a tank with a capacity of c 2 5 800 400 2 5 400 1 000 gallons. 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. 0 2 litres of hot water per second when you run the kitchen taps.

So as a rule of thumb you will use. 70 80 litres of hot water to run a bath. T is the time of your peak demand in hours. That said a mains pressure system can use about 18 litres of water per minute at 40 degrees celsius if a decent quality shower head is used.