Thermalec heaters are world leaders in electric swimming pool & spa heating. 

Founded in 1966 by Gerry Williams, they were the first first company in Britain to manufacture a range of electric heaters specifically for public, commercial, and domestic swimming pools & spas, and they developed a reputation for high quality and dependable products which continues to this day.

Thermalec was acquired by the Meddings Group in 1999 and this acquisition enabled Thermalec to develop and establish itself as the market leader in the UK.

Following the Meddings Group ceasing trading in 2025, the Thermalec® trademark and all rights were acquired by Systronique Ltd., and production and technical support was reestablished using the skills of former staff, building on the Thermalec legacy to reinvigorate and grow the product range.

Thermalec heaters are highly efficient, reliable, and economical, and are ideal for maintaining a constant temperature all year round.

Key features of the product range are:

• All parts of Thermalec® heater in contact with water, including the titanium elements, are highly resistant to corrosion from pool chemicals. Thermalec® pool and spa heaters can safely be used with sea water pools as well as in demanding applications such as Hydrotherapy and Thalassotherapy.
• The titanium elements have a very low watt density, meaning that a relatively low amount of power is spread over a large surface area. The benefits are a more efficient and even heat distribution, and a reduced temperature differential between the element sheath and the water, leading to greater element longevity.
• The unique spiral flow of water through the Thermalec® heater promotes efficient heat transfer from the elements, minimising element scaling and the build-up of sediment, thereby prolonging the service life of the unit.
• The internal design of the heater prevents the direct impact of cold pool water onto the heating elements, reducing thermal shock and further extending service life.
• The unique internal weir and baffle arrangement ensures that air generated from the pump is channelled harmlessly across the top of the heater and across the unheated ends of the elements. This avoids possible element burnout and thermal inefficiency due to wastefully heating air. 
• The high sensitivity and low operating differential of the control thermostat in a Thermalec® pool heater allows accurate control of the pool water temperature to within 1°C. 
• A highly reliable and sensitive safety thermostat is used in Thermalec® heaters, ensuring that excessive temperature causes the heater to shut down automatically.
• As a safety precaution, the heaters are provided with a pump interlock, which has to be connected to the filter pump control circuit. The heater will not operate unless the interlock is wired and the filter pump is energised.
  
  Please follow the link above for details of the Thermalec® product range.