How to Size a Boiler for Indirect Water Heaters

Sizing a boiler plant that will handle both space heating and domestic hot water is not a tricky task, but it also isn’t as easy as adding the two loads (space heating + domestic water) together.  I embedded a short slideshow that illustrates a straightforward method from ASHRAE’s standards.  This standard is more crucial for commercial buildings, but it can be applied to residential as well.