Diamond-H WTS Push-Fit Rod Thermostat – High Temp Dual Function Rod / Stem Thermostat 80°C Control, 90°C Safety

Product Code: ST-701

This is a Dual Function Rod / Stem Push Fit Thermostat with adjustable trip and fixed safety cut-out aimed at high temperature hot water applications such as thermal storage.

Operational switching is achieved via single pole stem control and a manually re-settable safety cut-off is via a capillary system.

Employing a capillary system for safety allows the benefit of sensing the water or fluid temperature within the vessel rather than the surface temperature of the tank/cylinder which gives far greater accuracy in switching.

The Diamond-H WTS thermostat is CE marked and ENEC approved to EN 60730 (-1:2000, -2-9: 2002) and EN 60335 (-1: 2002, -2-73: 2002).

Push fit electrical connections are equivalent to many popular push fit thermostat types such as Cotherm TSE, Cotherm TSR, Thermowatt RTS ranges

Key benefits over competitors:

  • High accuracy control
  • Highest accuracy safety switching (capillary action safety sensing directly in the tank/cylinder) – particularly important where high temperatures are required in hot water applications such as thermal storage.
  • Plug in system
  • 20 Amp 250 V AC
  • Tested to 100,000 operation cycles (higher reliability than common competitors)
  • Type 2 approved control


Most commonly installed in immersion heaters fitted to high temperature applications in cylinders from manufacturers such as Telford, R M Cylinders, Kingspan, Joule, etc.

Please note that this thermostat must be located in the upper part of any hot water cylinder in order to take advantage of it’s ability to control up to high temperatures. A safety cut out of 90°C will never operate if not located in the hottest part of the cylinder.

£21.60 £18.00 (ex VAT)

In stock

SKU: ST-701.

Category: .

Additional information

Weight 0.1 kg
Thermostat Type

20Amp/240v Single Phase Rod / Stem Thermostat

Length Inches


Preset Temp

80°C Max Operating Trip, 90°C Safety Trip


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