Water heater device and method of use

A portable tankless water heater comprising:

• a front panel with a display;
• a handle;
• a removeable rain cap;
• a gas control knob;
• a water control knob;
• a lower front plate;
• a lower back plate;
• a gas valve;
• an outgoing water valve;
• an incoming water valve;
• a battery box, wherein said battery box comprises a battery interface that prevents activation of said portable tankless water heater when said portable tankless water heater is not positioned in a substantially vertical orientation;
• an anti-tilt switch;
• a back panel;
• a heat exchanger;
• an ignitor bracket;
• a burner;
• an over-temperature sensor;
• a pressure sensor operatively connected to a pressure indicator;
• and
• a flame sensor, wherein said flame sensor initiates a shutdown procedure for the portable tankless water heater in the event said burner fails to ignite.