Summary: System boiler (sealed boiler system) guide, advantages of a system boiler and disadvantages of a system boiler.
A sealed (unvented) boiler system provides the central heating and hot water for a cylinder. The more familiar open vented system, commonly found in homes, uses two water tanks usually located in the loft, and a hot water storage cylinder positioned in the airing cupboard. The sealed system is similar, but uses less space in the loft as it requires one less storage tank. A cylinder will be needed in the airing cupboard as with the older styled system. People often replace the older open vented system with this sealed version.
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