Abstract: A system for supplying controlled temperature warm water to the space between a human body and a protector extending over the body comprising a source of pressurized water; a heat exchanger connected to the source to receive and heat the source water and discharge water at temperature T.sub.1 ; a mixing valve connected to the heat exchanger to receive the water discharge from the heat exchanger, the mixing valve having a cold water inlet and being operable to mix cold water with the water at temperature T.sub.1 received from the heat exchanger, thereby to provide and discharge a mixed water stream at controlled temperature T.sub.2, where T.sub.2 is less than T.sub.1 ; a plenum chamber connected with the mixing valve to receive discharged water at temperature T.sub.2 for mixing with warm water in the plenum chamber; and a duct extending from an outlet at the plenum chamber to deliver warm water to the space.