Patent ID: 8291930
Filing Date: 2012-10-23
Classification: F24D,Y10T

Abstract:
1. A hot water system comprising: a hot water pipe; a cold water pipe; a faucet, which has a hot water inlet, a cold water inlet and a water outlet, the hot water inlet connects to the hot water pipe, the cold water inlet connects to the cold water pipe; a water heater; a pump, which is connected with the water heater in series between the cold water pipe and the hot water pipe, and increases the water pressure in the hot water pipe and makes the water pressure in the hot water pipe higher than the water pressure in the cold water pipe; a water pressure detector, which detects the water pressure difference between a pump inlet and a pump outlet of the pump to decide whether the cold water pipe and the hot water pipe are connected, the pump starts when the water pressure difference is smaller than a predefined value, and the pump stops when the water pressure difference is larger than a predefined value; and a connecting unit, which connects the hot water pipe and the cold water pipe to let the hot water in the hot water pipe flow through the cold water pipe and back to the pump.