The Revel uses radiant heat and the same heat source for hot water. To regulate the temperature there's a mixer valve located under the dinette seat. It's a thoughtful and welcome addition. However, it's a kinda heavy brass valve sitting on 3 PEX "stalks" about 8-10" long. This is free to sort of wave around under the bench since it's not secured. This seems like it will put a lot of stress on the cheap plastic PEX fittings that used.
I decided to secure it.
The large hose clamp goes over the glycol reservoir, the small clamp goes around the valve and the tubing piece goes inbetween. The tubing piece was a short section of square tubing that I cut one wall out of. Took about 3 minutes.
This really seems to have solved the problem.