How can a hot water heater make enough heat for an entire house?

by axisqueenbee | Jul 8, 2015 | Questions about the Open Direct System

Houses are more efficient than they used to be. Most houses that are being built today use more energy for domestic hot water than they do for heat. Most domestic hot water heaters don’t do anything at all for 22 hours out of the day. You can get a hot water heater in any size that you want.