Tempering Valve Solar 20/25mm


High and low pressure hot water systems.
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Features & Benefits

Features and Benefits

  • Able to withstand 110°c (constant), ideal for solar and wetback installations
  • Extremely high flow rates make it suitable for both high and low pressure systems - 20 L/min at 2 metre head.
  • Forged, high quality, corrosion resistant DR brass body.
  • Machined, assembled and 100% tested in NZ.
  • Dual non-returns - ideal for unique pressures.
  • Failsafe shutdown - In the event of failure of hot or cold supplies.



  • Length: TV20S 130mm Length: TV25S 135mm
  • Factory set to give 55°C outlet. Can be adjusted from 35°C to 60°C.
  • Maximum inlet temperature 110°C
  • Stored water temperature must be at least 10°C above the Tempering valve setting and above 60°C (G12).
  • Inlet water pressures:TV20S 20 kPa (2m head) to 1000 kPa, TV20S 25 kPa (2m head) to 1600 kPa
  • Flow Rates:TV20S 20L/min at 20 kPa inlet pressure.TV20S 25L/min at 25 kPa inlet pressure.
  • Max. pressure imbalance between the hot and cold supplies 5:1
Tempering Valves Solar 2025

Flow Chart

Product Codes

TV20S 20mm Solar Tempering Valve
TV25S 25mm Solar Tempering Valve

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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