Heat Loss

Hot water temperature drops en route from the water heater to the fixture or appliance. How much heat is lost depends on the length of the hot water pipe and the air temperature surrounding the pipe. If the pipe runs through an unheated crawlspace or basement or along an exterior wall, the hot water temperature drop can be significant, especially in winter. The solution here is to insulate the hot water pipes. Also consider a hot water recirculating system for distant fixtures.