OK, I'm almost embarrassed to ask this question, however, here goes. I have owned 12 different RV's of every shape and size, including a couple of 40' diesel motorhomes, and have always winterized my own units so I'm not exactly a newbie. Actually been camping for 30+ years so it's never too late to learn
My issue with my 2007 Scamp
deluxe that I bought new. I have never been able to use the single shutoff valve plumbed into the hot water line lying on the floor that passes in front of the the water heater to "stop the water heater from filling" before I get antifreeze to the kitchen, bathroom facets.
I have turned that dang valve in the 2 directions the handle can be turned so many times I'm blue in the face. On one setting no antifreeze moves in the hot water "pipes" and the pump shuts off as system becomes quickly pressurized. Turn the valve a second direction and the hot water heater fills.
So the bottom line is it takes 5-7 gal of $3.50-$4.00 to fill the water heater and run antifreeze through all the hot water lines, and that's just not right!
Every other RV I've owned has had 2 valves that are easy to use and shut off the entry and exit lines to the water heater.
I'm beginning to think ( I know, geez, after 15 years) that the single valve is not a winterizing valve. If not I have no idea why it's there or what it's for. Hopefully someone can enlighten this old camper as to what I'm missing here.
As usual, I appreciate your thoughts and thank you in advance for any help!