Hot Water Tank Size Calculator Australia

Smith pro size sizing program is a tool that can be used to estimate water heater requirements for many common applications.

Hot water tank size calculator australia.

When selecting the size of the hot water cylinder a simple rule of thumb is that for a typical domestic household you should allow between 35 and 45 litres for every occupant. A π r 2 where r is the radius which is equal to 1 2 the diameter or d 2. The energyguide label lists the first hour rating in the top left corner as capacity first hour rating. This size tank is one of the most competitive sizes in the industry meaning you are bound to get the best price per litre on them.

It depends on the tank capacity source of heat burner or element and the size of the burner or element. As an example an instant hot water heater size for family of 5 would be a 21 litres per minute flow rate vs a hot water tank size for family of 5 would be 230 300l 60 80 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. V tank π r 2 l calculate the filled volume of a horizontal cylinder tank by first finding the area a of a circular segment and multiplying it by the length l.

Pro size is intended to assist in selecting water heaters or boilers that best meet the specific job requirements. In practical terms this may mean running out of hot water when you are in the middle of the shower lets see how you can avoid this scenario and get the correct tank size. This is assuming 3 showers running simultaneously with 3 star water saving shower head. Split systems which store the hot water in an external tank are generally favoured over thermosiphon systems for households with a bigger demand for hot water.

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. This is probably one reason why our 5 000 gallon 22 500 litre tank and 5 400 gallon 24 500 litre tank outsell all other sizes. As a rule of thumb households with a higher demand for hot water will need to install more or larger solar collector panels or evacuated tubes on the roof. With these two figures combined with your catchment area and water usage we can now calculate the optimum size for a water tank to suit your needs.

How to determine the size of a water heater tank.