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Gas System Boilers

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System boilers work by heating hot water for central heating systems directly while storing hot water in a cylinder for use in kitchens and bathrooms. The use of a storage hot water cylinder means system boilers can deliver a larger volume of hot water instantly – there’s no running the tap to get it warm, as you might need to with a combi boiler. Most commonly, you will find mains gas system boilers in the UK, although there are also oil system boilers and LPG system boilers for off-grid properties.

At Wolseley, we are the best for boilers. That means that our range of gas system boilers has everything you need to get the job done. With a range of wattages and sizes, we have gas system boilers suitable for every type of property. We stock a range of industry leading brands, including:


Be sure to also shop our range of cylinders and flues to get everything you need to complete your installation. If you are working on a repair, we also have a huge range of boiler parts and spares, so you’re bound to find what you need.


Register a trade account with Wolseley today to get access to our innovative product selector toolsPartsArena, rapid reordering, and free delivery on all orders to your home or site. You can also click and collect from your local branch.