Jimmy Buoy
Well-Known Member
- Dec 3, 2008
- 2,468
- Boat Info
- 2003 Cobalt 293
- Engines
- Twin Volvo-Penta 5.0 270hp & DuoProps
Where on the thermostat housing is the connection to the heat exchanger on your HW heater?
If it's the top then that area is only getting new water when the thermostat opens -- at least that's how it is on mine.
The brass plug on yours right near the blue drain plug was replaced using a brass tapered hose fitting. Inspecting mine with the t-stats removed reveals the "upper chamber" above the t-stat where the hot water exits via the open t-stat and is pushed into the two smaller hoses which terminate at the lower exhaust manifolds. There is also a smaller hole from the back side of the tubes for those manifolds which allows some water to flow between that "upper chamber" above the t-stat and the rest of the t-stat housing.
The area where the blue plug is is completely open from bottom to top other than a partial "wall" where the large hose (just inside the housing). I could actually see if from the bottom of the area where the t-stat is installed. Water has to go around that wall, but it is clearly open to the rest of the housing. Not sure if that brass plug is part of the "upper chamber" or not, but there is a separation wall somewhere in the housing where it becomes and "upper and lower" section like where the t-stat is located.
Where did you source your housings? The ones I've seen can vary wildly in price. Also, I take it you didn't have a low temp issue with yours before replacing?