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With an indirect water heating system and cylinder, the water that circulates around the boiler, pipes and radiators is kept totally separate from the stored water in the cylinder that is used for bathing.

From the outside the indirect cylinder looks identical to the direct cylinder save from two additional pipe connections on the side of the cylinder. Inside the cylinder a coil heat exchanger is installed, which allows hot water from the boiler to flow into the upper connection and leave at the lower connection to return to the boiler for re-heating. The hot water in the coil indirectly heats the water in the cylinder.

A Direct Cylinder is heated by a source located within the cylinder - such as an electrical immersion heater. Because the Immersion Heater is heating the water 'directly' the cylinder is called a 'Direct Cylinder'. In a direct cylinder there are no other external heat sources.

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Q: What is the difference between an indirect cylinder and a direct cylinder?
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