Thermostatic Mixing Valve


Where water temperature control must be precise or water is required to be at safe skin contact temperature (45°C) e.g. childhood centre, schools, old peoples homes, hospitals and institutions for people with psychiatric or physical disabilities.
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Features & Benefits

Features and Benefits

  • Fail safe shut down, controls temperature, factory set to 45°C.
  • Outlet temperature adjustable 35 - 60°C.
  • High flow rate, 40 L/min at 500 kPa.
  • Forged, high quality and corrosion resistant, DR brass body, nickel plated.
  • Integral no-returns means valve is ideal in ring main installations.
  • TMV 20 has internal chamfer to suit compression fittings - no union required.
  • TMV 20BV comes with right angle ball valves for easy testing, maintenance or replacement.
  • TMV 20 & TMV 20BV both have integral, 250 micron/60 mesh filters to ensure no debris enters the valve.



  • TMV-20 strainers (60 mesh, 250 micron)
  • TMV-20-BV strainers (60 mesh, 250 micron) & isolating valves
  • Factory set to 45˚C
  • Min. setting 35˚C
  • Inlet water pressures 50 to 1600 kPa
  • Outlet temperature adjustable from 35 - 60°C
  • Maximum inlet temperature 99°C
  • Stored water temperature must be at least 10°C above the thermostatic valve setting and above 60°C (G12)
  • Min. differential between hot supply and set temperature 10°C
  • Max. supply pressure 1600 kPa static, 500 kPa dynamic
  • Flow rate 40 L/min at 500 kPa
  • Max. pressure imbalance between the hot and cold supplies 5:1

Flow Chart

Product Codes

TMV 20           20mm, Thermostatic Mixing Valve TMV 20BV     20mm, Thermostatic Mixing Valve with right angle ball valves

Installation & Servicing


  • Refer to Technical Area for installation guide.
  • Valve to be installed by a qualified plumber.
  • Installation must comply with local authority requirements.
  • Valve may be installed in any orientation.
  • Flush pipes prior to fitting.
  • Connections are H (hot inlet) C (cold inlet) and OUT (tempered outlet).
  • Do not apply heat near valve during installation.
  • Do not install directly into cylinder outlet.
  • CautionValves not installed in accordance with these instructions may result in unsafe performance.
  • CommissioningThe outlet temperature must be set on site.
  • It should be set to and verified using a thermometer.
  • Remove cap.
  • Use a screwdriver to adjust to desired temperature with the water running.
  • Turn anti-clockwise to increase the temperature.
Testing and Maintenance
  • Testing should be carried out at least every 12 months. Note that the owner, occupier or facility manager needs to be notified that testing is being carried out and measures shall be taken to ensure safety during the testing.
  • Check cleanliness of strainers and non-return valves; check non-return valve operation.
  • Check the discharge temperature at the nearest outlet at both high and low flow using a thermometer with an accuracy of +/- 0.5˚C. Record the test results and the location of the valve. Isolate the cold supply and check that the thermostatic mixing valve shuts down the hot supply.
  • If a valve is found to be faulty during testing, it must be replaced.
  • The thermostatic mixing valve shall be replaced at intervals not exceeding 5 years. Servicing of the internals of the valve is limited to replacement of the complete unit



  • Complies with NZBC Clause G12(2001)
  • Complies with NZS 4617:1989
  • Complies with BS7942

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