"Eisboch" wrote in message
...

"Jim" wrote in message
.. .

"Walt Bilofsky" wrote in message
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Has anyone else has run into this problem with their boat's hot water
heater?

The problem is that once the water is heated up by the hot engine
coolant, the 110 v. electric water heating stops working, because a
thermal overload breaker on the heater trips.

The heater runs on engine heat or 110 v. The thermostat on the heater
includes a thermal breaker that trips when the tank goes above 170
degrees. The normal operating temperature of my Volvo diesel engines
is 175-180 degrees.

So eventually the engine coolant heats the water above 170, and the
thermal breaker pops. Now the heater won't work on 110 v. until the
thermal breaker is reset. (This requires disassembling the panel on
the heater to get to the breaker.)

Does anyone else run into this problem? Any ideas for a workaround?

The heater is a SureStor SS-12M made by Advanced Heat Transfer.

Wow. 170 is much too hot. 120 would be better and safer. Probably the
easiest solution would be to add a bypass line with a valve to control
the flow thru the water heater.

Problem is that controlling the flow will only slow down the rate of
heating the water.
Eventually, if the engine is being run long term, it will still get up to
the 170 degrees.

Another possibility is to add a mixing valve .... flows some of the engine
heat exchanger exhaust through the water heater along with a proportioned
amount of unheated water. Problem is, I don't know where to easily get
the cold water from without adding another pump.

Eisboch

I think the water heater is part of the closed cooling system. I don't think
the mixing valve would work. You did give me an idea, however. How about
putting a transmission oil cooler in line with the water heater input. You
could use the raw water pump to supply cooling water to the oil cooler.


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