Ravenheat Expansion Vessel 8 Litre 3/8 Thread 0004VAS06010/0

The Ravenheat 8 litre expansion vessel is a diaphragm-type pressure vessel used within Ravenheat gas boilers. It absorbs the expansion of system water as it heats, holding the sealed heating circuit at a stable pressure and protecting components such as the pressure relief valve from repeated discharge. This unit is supplied with a 3/8 thread connection and is listed by Ravenheat under the expansion vessels, tanks and cylinders spare part group.

• System pressure rises sharply once the boiler is running and the water heats up.
• The pressure relief valve discharges water, or the boiler loses pressure repeatedly after topping up.
• The pressure gauge reads high with the boiler cold, or swings widely between cold and hot states.
• Water is visible around the vessel connection or the vessel body shows corrosion or staining.
• The vessel feels heavy or full of water when the system is depressurised, indicating a failed internal diaphragm.

• Check the GC number and model plate on the appliance against the compatibility list to confirm this vessel is the correct fit.
• Confirm the part number on the existing vessel, and note that 0004VAS0305/0 is a previous number for this item.
• Check whether a gasket or sealing washer is needed at the connection point before fitting.
• This part is fitted to a gas appliance; installation must be carried out by a Gas Safe registered engineer.