Thermostatic Mixing Valves – a brief history.

The first thermostatic mixing valves (TMVs) were developed by Horne in response to market demands.

Our temperature control valves were already gaining popularity and these were used to control the temperature of domestic hot water in storage heaters. Commonly these heaters were required to supply hot water to kitchens and laundries as well as baths and showers. The kitchens and laundry processes, however, dictated that the water had to be stored at approximately 140°F (60°C) and it was recognised that this temperature is too high to be considered safe for bathing. The early blending valves were developed to supply warm water at the desired temperature for bathing, which was both safe and comfortable.

Today it is considered important that hot water storage and distribution should be maintained at temperatures in the region of 60°C to guard against the proliferation of water borne microbial organisms which can cause illness so the imperative for 'safe' hot water is as great as ever.

Horne Engineering Ltd is an independent, privately owned company which was started in Glasgow, Scotland in 1909.

Early products included thermostatic steam traps which were subsequently developed into thermostatic temperature control valves. These temperature control valves were known simply as the Standard valves and rapidly gained a reputation for giving accurate and reliable performance; features which stemmed from a robust design based on sound engineering principles. These qualities were demonstrated when Standard Valve No. 7146 was returned after an enquiry for spare parts in 1997. Our records show that this valve was originally supplied on March 19th 1929.

In the early 1920s, the product range was broadened with the development of the first hot water blender. These valves were the first versions of today's thermostatic mixing valves (TMVs).

Since then, Horne have continued to develop thermostatic mixing valve technology and now have a wide range of mixing valves for controlling temperatures on baths, basins and bidets and multiple outlets. In recent years, a range of surface mounted shower panels has been added to the Horne Product portfolio.

Our current core market in the UK and beyond is for temperature control of domestic water services, typically in hospitals, schools and large public buildings where the demand for a high level of performance, combined with safety and reliability over a maximized lifespan is at its' greatest.