The hot water rectangle
September 14, 2023 1:23 PM Subscribe
Gary Klein, a guru of efficient hot water delivery (awesome podcast interview), developed the "hot water rectangle" to quantify the efficiency of a hot water distribution system: the smallest rectangle possible that includes the water heater and all the hot water fixtures in a house. In other words, why does your hot water take so long? The big reason is that the water heater and the wet rooms (i.e., the rooms where water is used) are too spread out. When you put a water heater in an attached garage, for example, and a bathroom on the opposite end of the house, there’s a whole lot of pipe for the hot water to traverse on its way to the showerhead.