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the cylinder (known as Bottom Dead Centre or BDC) the exhaust valve starts to open. As the piston now moves up the cylinder, the hot gases (consisting mostly of nitrogen, carbon dioxide, water vapour and unused oxygen) are expelled from the cylinder. As the Piston approaches TDC again the inlet valve starts to open and the cycle repeats itself.
Inside of the hot water cylinder is a coiled pipe that is part of the semi sealed central heating and hot water system. The hot water from your boiler (also part of the semi sealed system) flows through the coiled pipe and consequently heats the water in the cylinder.here are two pipes attached to the small header tank (small cold water tank) which connects to the semi sealed central heating/indirect hot water system. In ideal conditions the purpose of the header tank is merely to control the expansion and contraction of the water in the semi sealed system as it heats and cools.