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General FAQ'S

General Frequently asked questions (FAQ) if these are not listed please contact our sales department on 01709 828292 or email directly to

Q:What if I don't know the part number for the element I need to replace?

We are aware of most elements on the market, but should we not be able to determine your requirement, then upon receipt of a picture, or technical drawing (including measurements of the element), we can investigate and identify it. Please email relevant details to

Q:No Temperature Marking on Thermostat

With the temperature marking it was expected that an exact temperature would be maintained however this was for reference only. We now only use " + or - " to increase the temperature turn Anti-Clockwise to reduce the temperature turn Clockwise
Please note the maximum temperature will be approx 70 degree C
Do not over turn past the adjuster stop.

Q:My Immersion Heater keeps Tripping and I have to reset

Rod type Thermostats do need adjusting from time to time
To reduce the water temperature turn the adjuster knob clockwise this hopfully should over come the problem.

Q:To find the Thread Size on the Immersion Heater brass boss

Domestic immersion heaters have a BSP thread size on the brass boss. The measurement across the diameter of the boss is approx 1/4" inches (7 mm) larger than the BSP thread size.

  • Example
  • 2 1/4" inch BSP diameter approx 2 1/2" inches.
  • 2 1/4" inch BSP diameter approx 64 mm 

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