Abstract: An improved swimming pool water flow system for filtering in and intermittently heating the pool water, and for interrupting water flow through the heat exchanger when no heating is required. The system improvement includes an improved water flow arrangement wherein pool water is drawn from the pool and, encountering a filter or chlorinator, is selectively diverted at a predetermined pool water outlet temperature into the heat exchanger. The water pump is thus used to pull water through the heat exchanger in counter circulating fashion only when the thermostat sensing pool water outlet temperature opens a control valve in the water flow path between the heat exchanger and the pump.

Abstract: A heat-exchanging system having an upright water tube in a water tank with an open upper end and connected at each end to a surrounding tube of larger diameter which forms a spaced jacket therearound and a centrally arranged tube connected at its lower end to the discharge of a compressor of a refrigerating system and extending upwardly within the water tube and connected at its upper end with the space between the water tube and its surrounding tube. The latter has an outlet connected to the return inlet of the condenser and hence the compressor of the refrigerating system. The water tank has a hot water outlet at its upper end connected with the supply inlet of a conventional hot water heater, and a cold water outlet adjacent its lower end, the latter being connected to the inlet of the water tube and to a source of pressurized cold water.