Low cost tankless portable water heater
View Patent ↗A portable tankless water heater includes a heat exchanger disposed in a sealed housing with an inlet cold water line and an outlet hot water line extending outside the sealed housing. A burner, disposed in an operative relationship with said heat exchanger is provided for heating water flowing through said heat exchanger and an exhaust system induces draft of air from a housing air inlet through said heat exchanger and out of a housing flue outlet.
1. 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.
2. The heater according to claim 1 wherein said burner apparatus further comprises a regulator interconnected with said ignition board and a dual solenoid valve for enabling said burner to operate at two BTU levels.
3. The heater according to claim 2 further comprising a temperature modulation switch disposed in said outlet hot water line and interconnected with said ignition board and said dual solenoid valve to control said burner to operate at a lower of the two BTU levels of a selected water temperature.
4. The heater according to claim 3 further comprising a temperature limit switch disposed in said outlet hot water level and interconnected with said ignition board for shutting of said burner at a selected high temperature.
5. The heater according to claim 1 further comprises a sensor disposed exterior to said heat exchanger and interconnected with said ignition board for determining blockage of draft air through detection of flames outside of a heat exchanger envelope, said ignition board being configured for stopping said burner upon determination of draft air blockage.
6. A portable tankless water heater comprising:
a heat exchanger heaving an inlet cold water line and an outlet hot water line;
burner apparatus, including a burner, disposed in an operative relationship with said heat exchanger, for heating water flowing through said heat exchanger;
an exhaust system including a blower apparatus for inducing draft of air from an air inlet, through said heat exchanger and out of a flue outlet;
an ignition board for operating said burner and said blower; and
a sealed housing suitable for mounting in a vehicle, enclosing said heat exchanger, burner apparatus, blower apparatus, and ignition board, and providing the air inlet and the flue outlet;
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.
7. The heater according to claim 6 wherein said burner apparatus further comprises a regulator interconnected with said ignition board and a dual solenoid valve for enabling said burner to operate at two BTU levels.
8. The heater according to claim 6 further comprises a sensor disposed exterior to said heat exchanger and interconnected with said ignition board for determining blockage of draft air through detection of flames outside of a heat exchanger envelope, said ignition board being configured for stopping said burner upon determination of draft air blockage.
9. The heater according to claim 7 further comprising a temperature modulation switch disposed in said outlet hot water line and interconnected with said ignition board and said dual solenoid valve to control said burner to operate at a lower of the two BTU levels of a selected water temperature.
10. The heater according to claim 9 further comprising a temperature limit switch disposed in said outlet hot water level and interconnected with said ignition board for shutting of said burner at a selected high temperature.