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Thank you for including model number for EZ identification of water heater To drain tank without drain valve: Remove TP valve at top of tank and siphon out the water. Then reinstall with correct pipe configuration shown in product manual.
Make sure it's off (hydro) and open drain at cold line going in bottom wherever you find a drain (usually close to it) going down through floor and outside under trailer. Follow cold line back until you see a line "T" and one line going down under trailer, and open it up underneath. Then open pressure relief valve at top of tank to allow for faster draining .
I had the EXACT same problem (installed my tankless last winter and worked fine, now this summer it fluctuates, have to turn the shower completely off and then on again to get any hot water and then it only lasts for a couple of minutes!) Argh - it is frustrating!
Here's what I found: the demand for hot water is lower during the summer (hot) months because the "cold" water coming in is already quite warm. You don't need as much hot water to make the shower temp comfortable. SO, my tankless was shutting off due to low flow demand. I've removed the flow restrictor from my shower head and it helped alot but didn't completely solve the prob. Next step is what has been recommended to me by several people but is much more expensive - change the pressure valve on your shower to a temperature valve. Or just wait til winter and it should work ok again :)
I assume your is an electric hot water heater. Is your water "hard" in your area? If so, it would be worth a try. What usually happens in a heater your age is that sediment builds up causing the lower element to overheat and burnout, causing less hot water to be produced
Yes, That will do it. Most RV appliance parts can be purchase at RV dealerships that have parts department. Camping world has always been very helpful. As far as A part # is concerned I can't confirm although it is good to have it and the make and model of the unit. Good Luck
Since the cold water works, the problem is not the pump. Look for a blockage or possibly a major leak in the hot water system. if you have a kitchen sink and bathroom sink, are both hot water outlets not working? Does the water heater have shut off valve , or is its drain still open from when you winterized it (and the water running out to the ground instead of to the faucet?