Sailaway wrote:
bob wrote:
Marine water heaters typically have two heating devices in one package.

The first is a standard 110V electrical heating element, connected
thru a thermostat mounted on the tank, more or less just like your
standard domestic water heater.

The second heating device is a coil of tubing inside the tank thru
which you can circulate your engine coolant.

Hi Bob,
Actually I was curious about the 12 volt heating device someone had
mentioned they had in theirs - would that one come with, or have
provision for inserting a thermostat or temperature sensor? Thanks

I followed the link posted by others and looked at the elements - they
look more or less exactly like standard 110V or 220V elements do - that
is, they do not have an integral thermostat. If your plan was to
install the 12V element in addition to an existing 110V element, then
you would need another thermostat as well. And perhaps even more
importantly, you would need another threaded tank penetration into which
to screw the element.

bob