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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Water Heater Expansion Vessel Kit A

Product ID: 49212828

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Details

Brand
Ariston
Capacity
2 litres
Special feature
Check Valve
Colour
White
Material
Brass Steel

💧2L capacity

🔧10 bar max pressure

⚖️1.5kg lightweight

Description

💧 Keep your water heater safe and sound with Ariston’s sleek pressure pro!

LIGHTWEIGHT DESIGN - Just 1.5kg for easy installation and maintenance
COMPACT 2 L CAPACITY - Optimized size for efficient pressure management without bulk
INTEGRATED CHECK VALVE - Built-in safety feature to prevent backflow and protect your system
HIGH PRESSURE TOLERANCE - Handles up to 10 bar ensuring reliable performance under stress
TRUSTED ARISTON QUALITY - Engineered by a leading brand for durability and peace of mind

The Ariston Water Heater Expansion Vessel Kit A is a compact, 2-litre expansion tank designed to manage pressure fluctuations in water heating systems. Weighing just 1.5kg and rated for a maximum pressure of 10 bar, it features an integrated check valve for enhanced safety. This reliable accessory ensures optimal performance and longevity of your water heater, backed by Ariston’s trusted engineering.

Specifications

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
Plug profile	internal
Special Features	Check Valve Safety Feature
Batteries included?	No
Batteries Required?	No
Item Weight	1.02 kg

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