Hi JayPampu,
Welcome to the Heartland Owners Forum.
The water heater will operate on either propane, or 120V AC, or both. How are you running it?
If you run just hot water, is it really hot? How long does it stay that way?
Also, is it a Suburban unit, or an Atwood? If you remove the outside cover, there'll be a label with the manufacturer name.