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Extensive range of heat pumps, heat exchangers, purifiers and accessories for swimming pools by Gullberg & Jansson.

Products designed to optimise energy use and climatic conditions for all your pool needs.

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  • Technical Services Launch

    E-Si launches a new business venture today, capitalising on the experience of more then 20 years of installing, servicing and maintaining mechanical and electrical system across the Channel Islands.

    Paul Fletcher CEO of E-Si said, "We have tried a lot of innovative product and techniques over the years from Power Tanks to heat pumps, solar heating, Thermal Stores, Solar Photovoltaic's and Wind Turbines. Mostly it worked well but sometimes it did not and so we made it work!". Renewable Energy, heating and power systems is a core engineering focus for E-Si Limited who have been trading in one form or another since 1991.

    E-Si found they were getting calls from new customers about heating and plumbing installations by others and that the general public needed help with 'legacy systems'. "I recognised our one-man-tech-team was running around from dawn till dusk fixing stuff and recognised there was a market opportunity". Solar panels, heat pumps and condensing boilers have now been on the market for years now and a lot of different types have been installed by a lot of different people. They need service and maintenance, and whilst the installation may have gone okay the company is coming across many operational problems and with their long, strong experience and engineering talent are able to fix stuff that others cannot or do not wish to.

    The renewable energy company has recruited two additional staff to assist Dave Thomas, Technical Services Manager. The cornerstone of E-Si, fondly known as 'Tech', have diverse skills in electronics, hydronics, refrigeration and mechanical engineering with fundamental understanding and training in plumbing and heating techniques, able to service solar systems to heat pumps and troubleshoot controls down to component level if necessary. These Renewable Energy Engineers have experiences from other industries and disciplines from RAF to computer manufacturing and Electrical Engineering in Hospitals!

    Dave Thomas, Tech Manager says "I am really looking forward to the technical challenges ahead. Myself and the team really enjoy getting involved in issues no-one else can fix and making the customer happy!".


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  • Latest News

    Latest Web Kube install by E-Si.

  • The latest Web Kube installed and opperating in clients home. The Web Kube is essentially the plant room for a heating system in a box, the box is mounted on a wall and connected to wire back pumps, actuators and sensors.
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  • SWIMMING POOLS, An insight

  • Probably, the most expensive luxury purchase you can make for your property is a swimming pool, which can make an absolutely fantastic addition. The surprising thing is how little they have changed over the years. In contrast, it never ceases to amaze how much more thought is put into the efficiency of your car and house. As a result, modern cars are much more efficient and indeed, our houses are much better insulated ­ and we have much more efficient heat sources to heat them.

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  • E-Si's latest Ecodan Air Source Heat Pump install.

  • Oil boiler out, Heat Pump in, good move and another happy customer.

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    Engineering - More than one way - A life changing career choice

  • This video sums it up: Engineers in Guernsey and World - shortage. Solution: Encourage into education, inspire and train. Great stuff from our local college.




  • Guernsey’s first Solar Century solar slate array. More Here

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