Importance

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Abstract

An anti-freeze apparatus for use with a recreational vehicle water system having a main water storage tank, a water pump, a hot water heater and domestic cold and hot water supply lines. The invention comprises an anti-freeze storage tank containing a supply of anti-freeze, a first valve mechanism in fluid communication with the anti-freeze storage tank and interposed between the water storage tank and the water pump and a second valve mechanism providing fluid communication between the water heater water inlet, the water heater hot water outlet and the domestic hot water line. The anti-freeze apparatus has a normal water supply state wherein the first valve mechanism permits water to flow from the storage tank to the water pump and the second valve mechanism permits pressurized storage water to flow to the water heater inlet and heated water to flow from the water heater outlet to the domestic hot water supply line; and an anti-freeze protection state, wherein the first valve mechanism prevents the flow of water from the storage tank and fluidly connects the supply of anti-freeze to the water pump, and the second valve mechanism prevents the flow of pressurized fluid to the water heater water inlet while directly connecting the pressurized storage water supply line to the domestic hot water supply line, thereby by-passing the water heater inlet, whereby anti-freeze is supplied to the entire water system except for the hot water heater and the water storage tank. The second valve mechanism will further include a check valve positioned between the water heater hot water outlet and the domestic hot water line for preventing the flow of anti-freeze into the water heater through the hot water outlet when the second valve mechanism is in the anti-freeze protection state. The first and second valve mechanisms preferably each include a three-way valve.

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First Claim