System combining water heater and refrigeration unit

A thermally-integrated system comprising:

• A. a compressor-type refrigeration unit including an internal line conducting a refrigerant in hot vapor form from a compressor to a normally-inactive main condenser, the refrigerant from the main condenser going through an expansion valve into an evaporator which returns the refrigerant to the compressor:
• B. a water heater tank including an inlet pipe feeding relatively cool incoming water into the lower region of the tank, and on outlet pipe drawing heated water from the upper region of the tank;
• C. an external line functioning as an auxiliary condenser, said external line running from the compressor to the main condenser through the water tank, the external line entering the tank in the upper region thereof where it passes through a water jacket interposed in the outlet pipe to serve as a heat booster, the external line then going to the lower region where it is coiled to define a heater exchanger to heat the water and condense the hot vapor;
• and
• D. means to render said main condenser active when the water temperature in the tank is too high to effect condensation of the hot vapor by the auxiliary condenser, said means including a pressure-responsive transducer coupled to the output of the main condenser to produce a control signal when the tank water temperature exceeds a predetermined level and a motor-driven fan responsive to said control signal to activate said main condenser.