Tempering Valve 25mm


Extremely high flow rate makes the TV 25 suitable for low pressure systems e.g. header tanks, open vented and low head systems. Also suitable for high demand mains pressure systems.

Features & Benefits

Features and Benefits

  • Forged, high quality, corrosion resistant DR brass body.
  • Machined, assembled and 100% tested in NZ.
  • Extremely high flow rates - up to 90 litres a minute.
  • Intergral non-returns mean valve is deal in ring main installations.
  • No pipe unions, no leaks



  • Inlet 25mm 1" BSP (male)
  • Outlet 25mm 1" BSP (male)
  • Length 135 mm
  • Height 105 mm
  • Inlet water pressures 20 to 1000 kPa inlet pressure
  • Flow Rates:TV 25 L/min at 20 kPa inlet pressure
  • Outlet temperature adjustable from 35°C to 60°C.
  • Stored water temperature must be at least 10°C above the Tempering valve setting and over 60°C (G12)
  • Integral hot and cold non return valves.
  • Operates with unequal water pressure up to 5:1 ratio (cold:hot)

Flow Chart

Product Codes

TV25 25mm Standard Valve (non-return in both inlets)

Installation & Servicing


  • Valve must be fitted by a qualified plumber.
  • Installation must comply with local authority requirements
  • Valve must be installed in any orientation
  • Flush pipes prior to fitting
  • Valve must be protected by line strainer
  • Connections are H (hot inlet), C (cold inlet) and OUT (mixed temperature outlet)
  • Do not apply heat near the valve during installation - this may damage the mechanism.
  • Do NOT install valve directly onto outlet of cylinder
  • 1 m MIN copper pipe length from cylinder to tempering valve, THIS IS MANDATORY REQUIREMENT OF G12.

Thermal Expansion

Remove cap. Use screwdriver to adjust to desired temperature. To increase, turn anti-clockwise (H). To decrease, turn clockwise (C). Replace Cap. Maximum delivered hot water temperature at any sanitary fixture used for personal hygiene shall not exceed 55°C.For childhood centres, schools, old peoples homes, hospitals and institutions for people with phychiatric disabilities, outlet must be set to max 45°C.



  • Complies with NZ building Code G12 (2001)
  • Complies with NZS 4617:1989
  • NZ Patent No. 517764, Aust. Patent No. 2003200856 RSA. Patent No. 2003/1992

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