Originally Posted by Dulcesuenos
So we installed a new 8 gallon waterheater runs off 110 and engine driven, just noticed the engine seems much hotter, (133 degrees to be exact on any cooling
and 110 ish everywhere else), while back on the dock
and with the power on. Is the engine staying at that temp for weeks or months at a time a big issue? The eng is a yanmar 2gm20
Any concerns? if so How to correct?
Ah you have a thromosiphon. That is the hot water
is flowing from the water
heater, which may be installed below the engine connections. That is allowing hot water to circulate by convection. It will not hurt the engine, but your burning more electric
to do that.
To stop that, put a 16" long U bend (pointed down is best, but up works too) on the upper engine water connection on the water heater. That will stop the circulation in the engine loop.