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Expansion Vessels and Cylinders

What are expansion vessel?

Expansion Vessels are used to compensate for the increase in water volume due to the varying water temperatures in hot water or heating systems. As we know, when water is heated it expands, and because water is not compressible, this will create an increase in water pressure. An Expansion Vessel is used to control this.

Expansion Vessels and CylindersHow do expansion vessel work?

Expansion Vessels allow for the extra water volume created when it is heated. As the water temperature inside the vessel rises, and more volume is created, the expansion vessel's membrane inflates to allow the water to fill the vessel.

The membrane inside the vessel will continue to expand until it reaches it's maximum temperature. Once this happens the membrane will be fully inflated and takes up the capacity of the vessel shell. The temperature will then gradually drop, which will decrease the volume of water.

Unvented Indirect Hot Water Cylinders

Unvented hot water cylinders store water supplied directly from the mains water supply, and heat it using either electrical heating elements or with heat from a boiler.  This provides high pressure hot water supplies capable of feeding outlets with high flow rates of hot water. The cylinders store water under relatively high pressures, typically in the region of 2 to 3 bar (20 to 30 metres head), and as such can supply water to outlets at high level, such as in a loft space, and at similar pressures to the mains cold water supply.  The increased pressures also make for better quality showers, without the need for pumps.  With both hot and cold water services fed from the mains, there is no more need for a cold water storage tank, keeping loft spaces clear, and pipework to a minimum.

For more information on our range of Expansion Vessels and Cylinders please call our team on 01524 63444 or email info@­hecas.­co.­uk.

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