Founded in 1948 in Grenoble, France by the Serigny family, the company specialized in the design and production of electro-mechanical thermostats for electric storage water heaters.

Over time the company diversified into different technologies such as performance plastics and electronics meanwhile developing its expertise in temperature control and over heat protection.


Export sales, driven by a will to expand into new geographical markets by the company owners, first started in the 1950s.  Today Cotherm products can be found in every continent and a variety of different markets.

In the 1980s and 90s, Cotherm significantly expanded its base with the creation of both sales and production subsidiaries and joint venture partnerships.

For the past 10 years, significant marketing and R&D efforts have led to a variety of innovative products in the area of energy management of air and water.  Cotherm continues to be the leading European expert in water heating technologies, working with major Original Equipment Manufacturers worldwide.