Many water heaters have a check valve on the outlet, this can cause issues, IF you have a 3-valve bypass system it is not needed, likewise on a 2 valve, if you have a single valve system I'd gut the thign and replace it with a quarter turn valve (or add one)
on the fresh water side of the wather heater (inlet) I have no idea why but some companies put check valves there as well.
These valves can reduce the flow of water when pressure drops, leading to more cold in the line.
page 2: HEVAC
Someone said that since the furnace was used they would have thought any live stuff in the ductwork would have gotten cooked,,, NOT SO, it does not get that hot in an RV system.
Home heat the burner comes on, then when it gets hot the blower
RV the blower comes on , then when air flow is great enough the burner
The result is the RV furnace puts out WARM, not HOT air.
