Champion Heating & Cooling     THINGS YOU SHOULD KNOW: Gallon capacity of old water heater (ELECTRIC) Wattage (KW) and voltage of old water heater (GAS) Type of fuel (natural or propane) (GAS) Exhaust vent diameter used on old water heater Dimensions of old water heater (Dia. ____ x Hgt. ____ ) THINGS YOU SHOULD CONSIDER: If you are running out of hot water, it could be due to an oversized or jetted tub, teenagers, or an added bathroom. Consider a larger water heater. (GAS) Check to make sure exhaust vent will handle a larger water heater with more BTU input. If you are planning to stay in your home, consider models made with a longer warranty, it’s less expensive when installation and maintainance expenses are considered. If you have hard water that leaves deposits on fixtures and requires frequent replacement of heating elements, consider a self-cleaning model.