Θερμοστάτης θερμοσίφωνου How to connect an electric water heater thermostat 

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This little device may look unimportant, but it is a very crucial device in an electric water heater circuit.
It is the thermostat, and it cuts the power to the heating element inside the heater, in order to prevent water from boiling (and the heater blowing up the house).
It has two internal circuits, one of them with a cicuit braker as a safety device, and the other with a bimetalic element which opens up and closes a pair of contacts, in order to cut the power to the heater core (or reconect it).
Using a simple bimetalic element, which is connected to the heat sensor inside the rod, it is able to open up the electric connection to the heating element, and stop the power to the heater.
The temperature at which the bimetalic will open up the circuit can be adjusted by the red circular knobe. A temperature of around 55° to 60° C is considered typical and normal, and doesn't cause limescale in the water, which in turn is a good thing, as any limescale will flow with the water and stick inside the pipes and also fall on our skin when we shower.
All thermostats have a simple diagram of the internal circuitry printed on top, so that the technitian will know which wire to connect where, but we can also check things out with our multimeter, and make sure that the internal contacts are working or not.
The thermostat is so important that regulation forbids connecting any heating device in a water heater, without using it.
That's how important this device is.
So always make sure you connect the heating element through the thermostat, and as always, when working with electricity, wear a good insulating pair of gloves and use proper tools.
This is single phase 220 AC power we're talking about here, and it is enough to kill a human being.
So always be careful, don't play around with electricity,
Don't be afraid of it, simply know it and respect it.
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