Ariston Kit A Expansion Vessel & Non-Return Valve

Ariston Kit A Expansion Vessel & Non-Return Valve. Accommodate expansion in a compatible unvented water heater installation. A useful accessory to identify by its product code when planning the heater installation or replacing the corresponding component.

What this accessory does

The expansion vessel provides space for heated water to expand, while the non-return valve helps prevent backflow towards the cold water supply. These are distinct functions that need to be considered as part of the complete installation.

Check the complete installation before ordering

Ariston lists this accessory in the installation guidance for Andris water heaters. Your installer should confirm compatibility, connections and whether this kit is required for your particular model and plumbing arrangement. Do not assume every Ariston heater uses the same fittings.

Some heater packages already include Kits A, B and C. Check the contents of your chosen product code before ordering accessories separately, especially when buying a 30L Andris model. If you are replacing an existing component, send us its markings and the heater’s model details so we can help check the product information.

Product specifications

Choose with confidence at Heatraq

Compare point-of-use water heaters, or visit our Help & Advice page for ways to contact us and the details to have ready. If you are unsure which model to order, send us the product code and tell us how you plan to use it. We can help with product information before you buy; your installer should confirm the installation requirements.