My Electric Water Heater is not working. Could be the thermostat or the element, but I plan to replace both. I've found a picture of what I thought was the top of the immersion heater:
However, it seems that this is in fact the thermostat, see
here, it is a Thermowatt RTS3.
I'm confused, because the thing that looks like this and screws into the large socket in my hot water cylinder at home is the heating element, it just has a thin plug-in thermostat.
Does anyone have any info on what I need to replace the heater and thermostat? Or perhaps some info on the hot water cylinder? Boat is a Bavaria 47, built in 2000.