I would be interested to know if you found an answer to this question....
I have a Isotemp hot water system running off my UNIVERSAL M25XP.
It works fine on shore power
, but hardly at all once underway - I wonder if it was plumbed correctly ?
It looks like the water heater is tapped into the coolant
circuit at the thermostat housing and again at the coolant header tank.
Does this sound correct ?