Joule is the UK's leading manufacturer of copper and stainless steel hot water cylinders. Joule’s solar packages have the prestigious IAB (Agrement) Certificate & Solar Keymark on all collectors. Joule’s solar packages are manufactured from high grade weather resistant materials. Joule’s in house engineers have extensive experience in assisting you in the design of your individual solar package to suit your needs. Joule’s state of the art modern manufacturing facility offers our customers detailed product traceability from order through to the manufacturing process, right up to delivery. Through our extensive R&D program we have developed and tailored our product range to make it the most sought after solar and cylinder brand on the market today.