Is this expansion vessel is pre-charged on delivery and what is the pre-charged pressure?

The pressure vessel is pre-charged at 3.5 bar.

Will this stop continual dripping from pressure relief valve on my 10ltr unvented water heater

Yes. It is necessary to allow for expansion. Hot water expands by up to 10% and the vessel allows for this. If you don’t fit then the pressure forces it’s way out via the tap (dripping) or out of the pressure relief valve.

what fitting do i need to connect this to my 15mm pipe work?

I suggest you take the vessel to a plumbers merchant and ask them to give you an adapter from the thread on the vessel to 15mm pipe.

Is the membrane made from epdm rubber?

It is synthetic rubber but I cant say if it is EPDM, Nitrile , or something else. I cannot think of any water component that would cause a problem with those.

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💧 Stay ahead of pressure spikes with Ariston’s sleek expansion solution!

PRECISION PRESSURE CONTROL - Maintains optimal system pressure to protect your water heater from damage.
COMPACT 2 L EXPANSION VESSEL - Space-saving design fits seamlessly with Ariston water heaters for hassle-free integration.
TAILORED FOR ARISTON SYSTEMS - Engineered specifically to maximize performance and compatibility with Ariston water heaters.
LIGHTWEIGHT EASY INSTALLATION - At just 1.5kg, it’s designed for quick setup without professional hassle.
DURABLE BUILD WITH PRESSURE RELEASE VALVE - Ensures safety and longevity by preventing overpressure scenarios.

The Ariston Water Heater Expansion Vessel Kit A is a 2-litre, lightweight (1.5kg) expansion tank designed to maintain safe pressure levels up to 10 bar in Ariston water heaters. Featuring a built-in pressure release valve and a 15mm check valve, it ensures system protection and longevity while offering easy installation tailored for Ariston models.

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Manufacturer	Ariston
Part Number	Kit A
Package Dimensions	24.8 x 18.9 x 16 cm; 1.02 kg
Manufacturer reference	Kit A
Colour	White
Item Package Quantity	1
Special Features	Pressure Release Valve
Batteries included?	No
Batteries Required?	No
Item Weight	1.02 kg

AristonWater Heater Expansion Vessel Kit A

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