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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💧 Keep your hot water flowing flawlessly with Ariston’s pressure-perfect expansion kit!

LIGHTWEIGHT COMPACT DESIGN - Easy to install without adding bulk or weight to your system.
TAILORED FOR ARISTON HEATERS - Specifically designed to fit and perform flawlessly with Ariston water heaters.
COMPLETE KIT WITH CHECK VALVE - Includes a 15mm check valve for seamless integration and enhanced safety.
OPTIMIZED 2 L EXPANSION VESSEL - Perfectly sized to handle pressure fluctuations and protect your water heater.
ROBUST 10 BAR PRESSURE RATING - Engineered to withstand high pressure, ensuring long-lasting reliability.

The Ariston Water Heater Expansion Vessel Kit A features a 2-litre capacity vessel designed to absorb pressure changes up to 10 bar, weighing just 1.5kg for easy installation. It includes a 15mm check valve and is engineered specifically for Ariston water heaters, ensuring optimal protection and performance.

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AR$218799

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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

Ariston Water Heater Expansion Vessel Kit A

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