What Size Tankless Hot Water Heater Do I Need

When it comes to tankless water heaters size really does matter if you have a unit installed that s too small you won t have enough hot water to meet your household s needs.

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. The best gas option in this case would probably be rinnai v series. To replace a 50 gallon water heater you would roughly speaking need.

Simply locate the appropriate water heater sizes on ecomfort using your information. 7 gpm gas tankless heater or at least an 18 kw electric tankless water heater if you live in the southern part of the usa. Below we ve highlighted what size water heater you would need in our example of 6 5 gpm at a 63 f temperature rise. You ll need a tankless water heater that can provide a temperature rise of 50 f for about 6 gallons of water per minute.

The number of taps and fixtures using the hot water from the tankless water heater determine the ideal size and flow rate of their tankless water heater. How big of a tankless water heater do i need. For instance a family of four with 3 showers kitchen and other sinks can require 8 gpm or more depending on how many fixtures that run simultaneously. Starting with 52 degree water this means you need a tankless unit capable of delivering a temperature rise of 50 to 68 degrees.

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The answer is simple. The resulting figure is called gpm gallons per minute or sometimes flow rate which helps determine your hot water heater size. The temperature you want at the tap ranges from 102 degrees for the bathtub and shower to 120 degrees for the dishwasher and washing machine. Like a hot water tank for 5 people will require at least a 60 gallon tank.

On the other hand an over sized unit will cost more to purchase and operate than what s needed nullifying one of the biggest benefits of tankless water heaters energy efficiency. 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. Gallons per minute gpm is the key when it comes to sizing tankless water heaters.