Stem thermostat for water heaters

Stem thermostats works using the differential expansion of the sensing element which causes the opening of a snap-action switch in the rod thermostat head. In case of abnormal temperature rise, the patented double safety device acting on stem and on bimetallic disk or traditional bimetal ensures double pole safety.

The limiter is manually resettable.  Stem thermostats are widely used worldwide to control water temperature thanks to their reliability and easy and quick plug-in installation which reduces mounting and wiring costs


Thermowatt has always been synonymous of thermostat and it is well-known all over the world for the quality, safety and reliability of its products.

Specific know-how in experimenting with materials, long experience in producing and controlling heating and the most advanced laboratory in the field have enabled Thermowatt to achieve numerous patented technical solutions.

Thermowatt thermostat, an extremely thermosensitive with guaranteed reliability, is manufactured with an assembly process that uses the most modern technologies and a specific system to manufacture and anchor the circuit.

Thermowatt thermostats are realiable, safe and innovative which is why are among the most used worldwide in hot tank, electric and solar water heaters.

Standardized production, computerized thermostat calibration processes and rigorous controls allow Thermowatt to ensure an excellent level of quality and reliability of its products using mass production processes according to the certificates issued by the most prestigious international  institutes.

four pillars, for constantly evolving ideas.

& Experience

After 50 years of developing high quality electric heating elements and thermostats we reached a unique know-how.

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Continuous investments and listening to the customer needs are key to a company policy aimed at constant innovation.

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360° Support

Our support starts during the product design and goes on, step by step, till the after-sale.

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Quality, Reliability and Safety

Our Full Reliability Approach guarantees best in class products certified by the major international institutes.

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