Hmm. I don't know how your system is designed. On our '21 Esteem, I did my own thing to provide hot water on demand. My system uses an electrically operated solenoid valve that takes hot water from just below the kitchen slide and routes it to the drain line for the fresh tank which is only a couple of feet away. It does not pass water from the hot line to the fresh tank unless the system is activated for the "event". We installed whole-coach RO, so all of our water is used from the fresh tank, so there is zero problem with the system for us, from routing it back to the fresh tank.
Is there a way to turn your system off? If it is using teh pump to "recirculate" the hot water to the fresh tank, it must be the same idea as what I came up with. When you get ready to shower, for example, how do you tell the recirculation system to do its job? It can't be running continuously, or your fresh tank would contain extremely hot water. Can you do something to turn the feature off? Or is there something you can "not" do to keep the feature from turning on?
I can't say, on the temperature question. On ours, the output temperature of the water heater can be set by the control panel. I am assuming yours is set higher than 84 degrees. Are you getting 84 degrees at both sink locations and the shower too, or just at one sink?
Jim & Angie, Boise, ID
2021 Entegra Esteem 27U
2017 GMC Acadia Denali