What Size Tankless Water Heater Do I Need For Shower

How to size a tankless water heater.

What size tankless water heater do i need for shower. Remember the maximum flow rate that manufacturers mention in the description is not what you ll get at your place. You ll need a tankless water heater that can provide a temperature rise of 50 f for about 6 gallons of water per minute. 1 2 fixtures at once you ll need at least 3 5 gpm. Like a hot water tank for 5 people will require at least a 60 gallon tank.

The first factor in choosing a tankless water heater is calculating the size of your hot water heater. While traditional tank water heaters are calculated by your family size a tankless water heater is calculated by the quantity and types of fixtures or appliances it will serve. You ll need to be able to heat at least 5 2 gallons of water. Gallons per minute gpm is the key when it comes to sizing tankless water heaters.

But a tankless option with comparable output for instance the takagi tankless natural gas water heater available from supplyhouse is just 20 inches high 14 inches wide and less than 10 inches. Electric units have measurements in the 10 inch high to 7 inch wide range while gas fired. Below we ve highlighted what size water heater you would need in our example of 6 5 gpm at a 63 f temperature rise. So you ll need a tankless water heater that can produce at least a 60 degree rise in temperature at 5 2 gallons per minute.

As a result you need to look at the tankless water heater s gpm flow rating based on a 58 degree temperature rise. The answer is simple. Since tankless water heaters supply endless hot water you don t have to worry about capacity but instead think in terms of water flow rate. If you want a normal 105 degree shower that means you have a 58 degree temperature rise 105 47 58.

2 3 fixtures at once you ll need at least 5 gpm. Once you have your total flow rate and the required temperature rise you can find the right size tankless water heater for your home. You ll need to raise the incoming water temperature from 40 degrees to 105. In this case you would want a tankless water heater with a temperature rise of 50 degrees.

However when comparing with under sink or point of use tankless water heaters it is relatively large. Size of tankless water heater for shower tankless water heater size is normally small and suits different needs of various families it can be installed either in a tiny studio or large apartment. Simply locate the appropriate water heater sizes on ecomfort using your information. Tankless water heaters are much smaller than units with a storage tank allowing them to be wall mounted.