How big of a tankless water heater do you need?

It is also important to determine the size tankless water heater that I will need to heat water for my family of five.

How many gallons per hour does a tankless heater heat? The flow rate of a tankless heater is measured in gallons/minute. This is based on the heat rise, which can be between 4 and 8 gallons/minute. A heater that heats 4 gallons/minute can heat a shower and one appliance simultaneously.

You may also wonder, "What are the disadvantages of a tankless water heater?"

Tankless water heaters provide an unlimited supply of hot water. They take up less space, are more reliable, and last a lot longer. Tankless heaters have a disadvantage in that they are more expensive to install and cost upfront than traditional tank heaters.

Is a tankless water heating system worth the investment?

The U.S. Department. According to the U.S. Dept. of Energy, a tankless hot water heater is 25-to-17% more efficient than a traditional water heater. This results in savings of $25 to $107 annually. A tankless water heater is 24% to 34% better if your hot water consumption is less than 41 gallons per days.