Continuous HWH woes. Suburban IW60
We have a 2019 Rockwood 5th Wheel and had the hot water heater upgraded to a tankless Suburban IW60 (90% Sure re: model).
We live in it and it took some troubleshooting after we took delivery to get the heater to work, but for the last couple of days, it has been driving us nuts.
First some background. We live in the Sierra Nevada region at 3600 feet not too many miles from the Rubicon River and Trail. The cold season is upon us. Also, being so rural, our water is from a well which is shared by us and three other households. One of those was added last spring.
About the middle of this last summer, the heater would refuse to make the shower or bathroom sink water hot. However, if we turn on the kitchen hot water, or start the stove, it seems to prime the propane and the bathroom hot water starts working. We've always had SOME issues with getting hot water temperature to stay consistent, but usually with only slightly unpleasant variations. Inconsistent water temperature seems to be remedied by making sure the tanks are full.
Now that temps are dipping to freezing for the first time this year, the variation is from too hot, to freezing cold and back again for the last two days.
What is the most likely culprit? low water pressure? something with the propane? something I'm not catching?