Patent ID: 7779857
Filing Date: 2010-08-24
Classification: F24D,Y10T

Abstract:
1. A hot water system comprising: a hot water source; a hot water delivery line connected between said hot water source and at least one plumbing fixture; a cold water delivery line connection between said plumbing fixture, a cold water source and said hot water source; a pump connected between the hot and cold water delivery lines, at a point remote from said hot water source, and proximate the plumbing fixture for circulation of water from the hot water delivery line through the cold water delivery line and into the hot water source; a controller for causing the pump means to circulate water from the hot water line into the cold water line proximate said plumbing fixture and back to the hot water source when a plumbing fixture hot water valve is turned on; a temperature sensor, connected to said control means, for causing said controller to stop the pump in order to prevent heated water from being circulated through the cold water delivery line; and a thermostatic valve disposed in a serial arrangement with said pump between the hot and cold water lines, for blocking flow of water from the hot water line into the cold water line when said pump is not operating, operation of said thermostatic valve being independent from said temperature sensor, and controlled at a separate temperature setting.