Patent ID: 8505498
Filing Date: 2013-08-13
Classification: F24D,Y10T

Abstract:
1. A commercial hot water system comprising: a) a boiler; b) a hot water storage tank interconnected with said boiler; c) a hot water delivery line connection between said plumbing fixture, a cold water source and said boiler; d) a pump connected between said boiler and the storage tank for circulation of water from the storage tank to said fixture and return to said storage tank; e) a controller for causing said pump to circulate the water back to the hot water source when hot water at a plumbing fixture is turned on; and f) a temperature sensor located on the hot water delivery line upstream from the plumbing fixture, connected to said controller, wherein said temperature sensor is structured to detect a hot water temperature increase of two degrees or more, and to cause the controller to stop the pump if said hot water temperature increase is exceeded in order to prevent heated water from being circulated.