Hey, folks. I've searched and read many threads and the primary impression I get is to dump this PrecisionTemp unit and upgrade to an Aqua Hot but I'm thinking that, at that price, this won't happen until we upgrade our RV.
So in the meantime, I am trying to resolve a problem where our hot water will not stay hot. It starts out hot--at about 110--but as soon as the water from the holding tank runs out, the temp drops fairly rapidly, down into the 80s. After a couple of calls with the PrecisionTemp Support team and turning up the mixing valve to maximum with no change to hot water delivery, we've narrowed it down (hopefully) to either some sludge in the antifreeze tank (which is preventing adequate heat transfer while running the hot water) or scaling inside the mixing valve (which is not allowing enough hot water to pass through).
I truly hope that one of these will fix the problem but I'm not confident after reading all the posts about all the problems with these units and the fact that this unit is only 2 years old (or less!). Still, I am planning to start with a flush and cleaning of the antifreeze so that I have a fresh start. (We bought this RV back in December so I don't know when it was last changed but this unit was installed in 2019 so it's likely due for an antifreeze flush, anyhow.) '
As for which antifreeze to use, I've asked PT Support in three different calls over the past couple of months to make sure I don't mess it up and here is what I *think* I know so far:
- Most common brands are Peak, Camco, and Century.
- Must use an antifreeze "for multiple metals." (Does "safe for aluminum" mean it is safe for multiple metals? Because I haven't seen this "safe-for-multiple-metals spec" on any listing.)
- Should NOT use a "pre-mix" (diluted, "ready to use," 50/50, or other) solution.
- Should mix the antifreeze at 60/40 for Peak or 50/50 for the other two (where 60 is antifreeze and 40 is distilled water).
- "It should say "boiler antifreeze" on the bottle." (I have not seen these words on any bottle I've found online or on the two spare partially full antifreeze bottles that came with the RV.)
- Should use propylene glycol only (or at least do not mix ethylene glycol with propylene glycol--insta-sludge and voided warranty would result if mixed).
I've searched locally, on Amazon, and on Google and I can't figure out which product to buy that will fulfill all of the above requirements. Most appear to be diluted or pre-mixed and none say "for boilers" or "heat transfer fluid" and many say they are for winterizing (but I don't think that in itself means it can be used as the heating fluid).
So does anyone have a definitive answer regarding at least one option that fits the bill and does not void the warranty?
And if anyone has advice on other things to try regarding the inability to maintain hot water, that would be great, too. Because after I flush this thing, if it's still not staying hot, then I'll need to remove the mixing valve, soak it in CLR, and *hope* that does the trick (and I'm guessing it won't--maybe a bad mixing valve?).
Thanks in advance for any guidance on this one!