Water Hearter Source For Full-Time

Years ago I had a pickup with a 100 gallon propane tank in the bed. It would run on both gas and propane. When my propane tank emptied the truck would begin to run rough, I would hit a button and it would switch to gas. I would run a full tank of gas thru the truck while I refilled the propane tank. Then I woul refill the gas tank.
Saying that; since you have a 250 gal. propane tank, why don't you just switch to electric about one day a week (or any time period that works for you) and keep everything in good working order.