---
product_id: 49212828
title: "Water Heater Expansion Vessel Kit A"
brand: "ariston"
price: "£41.98"
currency: GBP
in_stock: true
category: "Ariston"
url: https://www.desertcart.co.uk/products/49212828-water-heater-expansion-vessel-kit
store_origin: GB
region: United Kingdom
---

# 2L capacity for optimal pressure balance Max 10 bar pressure tolerance Compact 1.5kg design for easy installation Water Heater Expansion Vessel Kit A

**Brand:** ariston
**Price:** £41.98
**Availability:** ✅ In Stock

## Summary

> 💧 Elevate your water heater game — compact, powerful, and built to last!

## Quick Answers

- **What is this?** Water Heater Expansion Vessel Kit A by ariston
- **How much does it cost?** £41.98 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.co.uk](https://www.desertcart.co.uk/products/49212828-water-heater-expansion-vessel-kit)

## Best For

- ariston enthusiasts

## Why This Product

- Trusted ariston brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Reliable Safety:** Integrated check valve safeguards your system, giving you peace of mind with every hot water cycle.
- • **Trusted Quality:** Backed by Ariston’s renowned engineering and a 4.4-star rating from hundreds of satisfied users.
- • **Compact Powerhouse:** 2-litre expansion vessel designed to seamlessly fit into your Ariston water heater system without hogging space.
- • **Pressure Perfected:** Engineered to handle up to 10 bar max pressure, ensuring your water heater operates safely and efficiently.
- • **Effortless Installation:** Lightweight 1.5kg kit with included 15mm check valve, making setup quick and tool-friendly for busy professionals.

## Overview

The Ariston Water Heater Expansion Vessel Kit A features a 2-litre capacity vessel with a 15mm check valve, designed for easy installation and reliable pressure management up to 10 bar. Lightweight and compact, it fits seamlessly with Ariston water heaters, ensuring system safety and efficiency backed by strong customer satisfaction.

## Description

Ariston Water Heater Expansion Vessel Kit A Pack Contains: 2 Litre Expansion Vessel 15mm Check Valve Suitable for Ariston Water Heaters

## Features

- Ariston Water Heater Expansion Vessel Kit A
- Capacity 2 litres
- Weight 1.5kg
- Max pressure 10 bar

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B00QVMB9KG |
| Best Sellers Rank | 120,907 in DIY & Tools ( See Top 100 in DIY & Tools ) 215 in Water Heaters & Parts |
| Brand | Ariston |
| Capacity | 2 litres |
| Colour | White |
| Customer Reviews | 4.5 4.5 out of 5 stars (251) |
| Is Electric | No |
| Manufacturer | Ariston |
| Manufacturer Warranty Description | 12 months. |
| Material | Brass, Stainless Steel |
| Maximum Pressure | 10 Bars |
| Model Number | 445190 |
| Mount Type | internal |
| Part Number | Kit A |
| Special Features | Check Valve Safety Feature |
| Style | Water Heater Accessory |
| UPC | 708747445190 |

## Product Details

- **Brand:** Ariston
- **Capacity:** 2 litres
- **Colour:** White
- **Material:** Brass, Stainless Steel
- **Special feature:** Check Valve Safety Feature

## Images

![Water Heater Expansion Vessel Kit A - Image 1](https://m.media-amazon.com/images/I/61Qp16DzHlL.jpg)

## Questions & Answers

**Q: Is this expansion vessel is pre-charged on delivery and what is the pre-charged pressure?**
A: The pressure vessel is pre-charged at 3.5 bar.

**Q: Will this stop continual dripping from pressure relief valve on my 10ltr unvented water heater**
A: 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.

**Q: what fitting do i need to connect this to my 15mm pipe work?**
A: 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.

**Q: Is the membrane made from epdm rubber?**
A: 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.

## Frequently Bought Together

- Ariston Water Heater Expansion Vessel Kit A
- Ariston 406802 KIT B 3.5 BAR Pressure REDUCING Valve, Bronze
- Ariston 406807 KIT C Discharge TUNDISH (15MM-22MM), Black

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*Product available on Desertcart United Kingdom*
*Store origin: GB*
*Last updated: 2026-05-25*