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Indirect Tank Sizing

Indirect water heaters are sized by the hot water load. Determine all the devices that will use hot water. Very large users of hot water should be determined separately. Once you determine the hot water gallons needed compare the tanks first hour rating and boiler size.

This is for residential applications only.

When you do all the math compare it to the first hour rating of the chosen indirect.

Now chose the tank size from the manufacturers indirect chart

The choice would be an AL27SL in this example. This should work on any coiled tank indirects.

Commercial sizing will be added in the furture.

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