Valve Sizing Tool

HORNE 20 Thermostatic Mixing Valve with Wall Mounting Kit


Including swivel inlet connections, strainers, check valves, flow regulator, wall bracket, screws and wallplugs. Pipe connections by compression fitting for 22mm copper pipe. In chromium plated finish. Product Reference H20-12C and drawing PA-579P. To be installed according to the manufacturer's instructions and commissioned in accordance with water regulations and bylaws using the Horne H20 Flushing kit.

Designed and manufactured by Horne Engineering Ltd

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Suitable for point of use thermostatic mixing at baths and for supplying mixed water to a group of basins and shower outlets.

For sizing a TMV for group mixing applications use our simple

Valve Sizing Tool
A group installation of Duso shower columns fed with pre-blended warm water from a group TMV (Horne 20 or Horne25)


  • High performance Type 3 approved thermostatic mixing valve delivers accurate and reliable temperature control
  • Full bore, high capacity fine mesh strainer optimised to protect the thermostatic mechanism and all downstream fittings
  • Swivel inlet connections for installation in any orientation
  • Quick and easy to install - fewer pipe connections required than traditional installation
  • Easy access to strainers for maintenance, pipe flushing and water sample collection
  • Ease of maintenance

Standards and Approvals

  • The HORNE 20 TMV is designed to meet the requirements of BS7942:2011, 'Thermostatic mixing valves for use in care establishments'.  Recertification as a Type 3 thermostatic mixing valve, to NHS Model Engineering Specifications D 08 Thermostatic mixing valves (Healthcare premises) is pending.
  • All materials in contact with potable water are selected for compliance with UK Water Regulation 4.  Recertification is currently pending.
  • All HORNE products are manufactured under our Quality Management System to BS EN ISO 9001:2015.  Certificate No. FM 01224


Operating Parameters

Mixed water temperature setting at factory   41°C
Range of temperature adjustment   35 - 46°C
Range of hot water supply temperature   55 - 65°C
Maximum static pressure     10 bar
Range of maintained water supply pressures   0.2 - 5 bar 

Useful Documents

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Optimise performance and maximise the lifespan of your Horne Optitherm thermostatic taps, showers and point-of-use mixing valves.

Click the link to access a full suite of narrated installation and maintenance training videos, plus other instructional resources.

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