An expansion vessel is a device that takes up the expansion of water in the domestic hot water system when it is heated. This prevents build up of excess pressure.
The non-return valve prevents backflow of expanded hot water in to the cold water main.
Please note that these product properties are not a replacement for the manufacturer's literature and it is always recommended that Ariston Thermo UK is consulted before specifying.
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| Uniclass (?) | Pr_60_50_20_28 Expansion vessels | |