Wildcat RVs come standard with tankless water heaters (made by Girard), so I know a bit about the subject.
Here's a bit of information on tankless water heaters with regards to electric vs. LP Gas use
1. A Gas/Electric Tank Water Heater usually uses both energy sources. The gas or gas/electric is used for recovery
and the electric is used to maintain
the temperature 24 hours a day, 7 days a week, 365 days a year.
2. A tankless water heater will heat only the hot water that is needed (useable hot water) based on demand. There's no recovery or maintaining the temperature of a tank of water and so no worry about running out of hot water (which is why they sometimes call it "endless").
3. Fuel efficiency is greater in a tankless water heater -- it uses 50-60% less LP gas consumption for the same amount of hot water that a tank water heater provides.
A little math on LP Gas:
-- There are 92,000 BTUs/per hour in a gallon of LP gas.
-- The Girard Tankless Water Heater will operate at 34,000 or 27,000 BTUs per hour depending on the incoming cold water temperature.
-- With Girard's tankless water heater, 1 gallon
of LP gas will provide the camper with over 2.7 hours of ”Usable” Hot Water at 34,000 BTUs or over 3.4 hours of “Useable” Hot Water at 27,000 BTUs.
-- A camper can easily figure how much time/demand for hot water they actually use a day.
-- A pair of full 30# LP gas tanks (7.09 gallons per tank) provide a total of 14.18 gallons of LP gas.
Hope this helps!
If you want more info, check out this web site:
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