Remodeling Tips and Reviews

Correctly sizing a tankless hot water heater

Correctly sizing a tankless hot water heater

Jan 10, 2012

To make sure a house has the proper size tankless water heater you must first determine just how many uses will occur at the same time. Most small tankless units are designed to run 1 to 2 fixtures at a time. This would be something like a shower and the dishwasher. These units typically support a flow of around 4 gallons per minute. An average shower uses about 2.5 gallons per minute. So you would not want to use a small unit if you planned on running 2 showers at a time.

The larger tankless water heaters support 3- 4 applications per minute and support 6-7 gallons per minute. These units are better suited for larger families. Many units can also be installed in a seriesĀ  to give a house the necessary capacity. This would involve installing to Takagi’s in a row and connecting both up to the supply and hot water. They would then distribute the homes load between them.