If you have a single-valve water heater bypass, the heater outlet check valve is already there.
I have one of these I bought to install in my Winnebago View motor home, as everybody on the View discussion group raved about it. I never got around to installing it. Is it really that good?
It's a safety feature as well. In some instances that "shock" can be a burst of extremely hot water rather than cold, possibly enough to scald.
Winnebago has a practice of installing a check valve on both cold inlet and hot outlet of water heaters. Since that is not standard industry-wide, some W owners have hot water flow problems and have difficulty finding the problem.
That is so. However, back pressure at the heater inlet is not an inherent cause of temperature problems at the shower head. The problem is a complex interaction of the plumbing layout and the relative pressures in hot and cold lines. As with many things, Internet meme concerning water problem fixes tend toward absolutes, but reality is nearly always much more nuanced.
Wow, no overflow pipe?
Over flow pipe on a gray tank????
Holding tanks don't have overflows.
What they usually do have is a vent pipe that extends up to a covered vent on the roof. Because that is so high the first place that a gray tank will overflow is into the shower. I suppose that the black tank might get so full that the toilet won't empty?
The gray water tank on my Ideal TT did, just for the above reason. I know this because when I was full-timing I was gone for the weekend and apparently I had a small dribble from the bathroom faucet and when I returned there was water all over the pad under the trailer. Closer inspection revealed an overflow pipe on the top corner of the tank that stood about 3-inches up from, and a 90° to the side of the tank, and it was dripping. It had a small screen on the end for keeping bugs and other critters out. For obvious reason the black water tank did not have an overflow. I haven't owned an RV since then but assumed they all had one for the gray water tank for that reason.
I have owned 6 different self-contained RVs over 40 years and have helped many other owners work on theirs and to date I have never seen a gray water tank with an overflow other than the shower drain.
This could have been something added by the previous owner. I had never given it a thought until I saw all the water. My Winnebago MH prior to that didn't have one.
