Storage combi boilers are a combi boiler that comes with a hot water cylinderwithin the boiler unit called a cylinder loading system or CLS. This water storage within the storage combi boiler allows for water to be constantly heated whilst in the cylinder, meaning hot water can be delivered to all parts of the house when needed such as. . These kinds of boilers are similar to system boilers in the sense that they have a water storage tank. Storage combi boilers draw water from the mains. . Like a combi boiler, a storage combi boiler gets water from the mains water supply, offering instant hot water when it's needed, however, a combi boiler doesn't utilise a hot water storage tank like. . Similarly to a system boiler, storage combi boilers have a hot water tank that store hot water so it is ready for use when it's needed. The differences between the two are that the storage combi boiler draws water from the mains water supply as well, so hot water is almost always available.
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