Patent ID: 8276548

Claim:
A portable tankless water heater comprising: a sealed housing having an air inlet and a flue outlet; a heat exchanger disposed in said sealed housing with an inlet cold water line and an outlet hot water line extending outside said sealed housing; burner apparatus including a burner, disposed in an operative relationship with said heat exchanger, for heating water flowing through said heat exchanger; a gas line extending outside of said sealed housing and in communication with said burner apparatus, an exhaust system including a blower for inducing draft of air from said air inlet through said heat exchanger and out of said flue outlet; an ignition board for operating said burner apparatus and blower; an anti-freezing thermostat switch disposed in said outlet hot water line and a solenoid valve connected to both of the said anti-freezing thermostat switch and said outlet hot water for drawing water from said outlet hot water line upon receipt of a signal from said anti-freezing thermostat switch, said solenoid valve being disposed outside of said housing.