The Invacyl unvented cylinder is designed to work using it factory fitted electrical elements. Offering a smooth tube and high-efficiency coils as standard. Invacyl cylinders come with Callefi safety components and is supplied with screwed connections with compression fittings and features a sleek grey outer case.

Our Invacyl cylinders have carefully been constructed using quality components and have been designed with performance in mind. Using our many years of involvement within the hot water industry and our knowledge of bringing unvented cylinders to the market we have created a new standard in unvented water storage.


• Duplex stainless steel
• Compression fittings as standard
• Quality components
• ERP compliant with smart immersion
• 25 year manufacturers warranty
• Full G3 kit , inlet control and expansion vessel included
• Available in various sizes 120L, 150L, 180L, 210L, 250L and 300L.

This item will be delivered directly by our supplier. Lead times are shown on the product and trolley pages and are always advertised in working days (Monday to Friday).

• If your order contains items stocked by us and items that come direct from the supplier, your order will be automatically split and processed accordingly.
• We will pass the details you give us, including delivery details, your email address and your phone number, to the relevant supplier.
• Most of our suppliers can deliver to any UK address. Delivery to remote or offshore postcodes may take a little longer than the advertised lead time. If the supplier cannot deliver to your postcode or we believe your order may take longer, we will try to tell you beforehand.
• Items that come direct from a supplier will be delivered by the courier chosen by the supplier. Where possible, suppliers will update you with delivery information. This may be by email, phone call or text message.
• Items delivered direct from suppliers cannot be returned through a store. You would need to return these items direct to the supplier, unused and in their original packaging, at your expense. You can arrange for most items to be collected by contacting our Customer Services team. A fee of £9* will be taken off your refund. There is no charge for faulty items being collected. *For big and bulky items, additional charges may apply.
• Please note, you cannot return bespoke or made-to-measure items unless they are faulty.