Hey, Rod!
Been a ling time. Prev owner of our 24' HRC replaced the water heater, apparently replaced DSI American/Morflo/Suburban with a standing pilot Atwood.s It wasn't a very clean job, and the Standing Pilot was a pain.
Like the others, I think it's time to replace, and I'd do it with a DSI Suburban. If your access door is close to square, then Suburban is the replacement.
The Atwood replacement had an electric element mounted on the inside side of the heater, and I ran it with an extension to an outlet for awhile. But our present coach has a Suburban DSI, and the LPG usage really isn't significant. It heats so fast that we get the hot water we need for dishes and shut it off. Might be different if we were heating water for showers, but we use campground facilities instead.
If God's Your Co-Pilot Move Over, jd
2003 Jayco Escapade 31A on 2002 Ford E450 V10 4R100 218" WB