---
product_id: 49212828
title: "Water Heater Expansion Vessel Kit A"
brand: "ariston"
price: "€ 77.36"
currency: EUR
in_stock: true
reviews_count: 8
category: "Ariston"
url: https://www.desertcart.be/products/49212828-water-heater-expansion-vessel-kit
store_origin: BE
region: Belgium
---

# 2L capacity 10 bar max pressure Compact & easy install Water Heater Expansion Vessel Kit A

**Brand:** ariston
**Price:** € 77.36
**Availability:** ✅ In Stock

## Summary

> 💧 Elevate your water heater game with smart, space-saving expansion power!

## Quick Answers

- **What is this?** Water Heater Expansion Vessel Kit A by ariston
- **How much does it cost?** € 77.36 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.be](https://www.desertcart.be/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

- • **Hassle-Free Installation:** Lightweight 1.5kg design with compact form factor saves space and time on setup.
- • **Compact 2L Expansion Vessel:** Optimized size for seamless integration with your Ariston water heater system.
- • **Integrated 15mm Check Valve:** Built-in safety feature to prevent backflow and maintain system integrity.
- • **Robust 10 Bar Pressure Rating:** Engineered to handle high pressure, ensuring reliable performance and safety.
- • **Premium Brass & Stainless Steel Build:** Durable materials designed for longevity and corrosion resistance.

## Overview

The Ariston Water Heater Expansion Vessel Kit A is a 2-litre, high-pressure (up to 10 bar) expansion tank designed specifically for Ariston water heaters. Featuring a built-in 15mm check valve and constructed from durable brass and stainless steel, this compact and lightweight kit ensures efficient pressure management and system safety. Backed by a 12-month warranty and praised for easy installation, it’s a reliable upgrade for any modern home heating setup.

## Description

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

Review: Quality accumulator - Very good quality accumulator definate value for money. Easy installation with compact design, meaning less space taken up by system installation. Excellent buy.
Review: Good product - It is working well after the plumber install it with the new water heater and piping. It is value for money as the price is lower than buying from the big brand 'Sxxxxfxx'.

## 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 | 144,253 in DIY & Tools ( See Top 100 in DIY & Tools ) 288 in Water Heaters & Parts |
| Brand | Ariston |
| Capacity | 2 litres |
| Colour | White |
| Customer Reviews | 4.5 out of 5 stars 251 Reviews |
| 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 |
| Special feature | Check Valve Safety Feature |
| Style | Water Heater Accessory |
| UPC | 708747445190 |
| Unit Count | 1.0 count |

## 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)
![Water Heater Expansion Vessel Kit A - Image 2](https://m.media-amazon.com/images/I/61XLEAlAz8L.jpg)
![Water Heater Expansion Vessel Kit A - Image 3](https://m.media-amazon.com/images/I/51qOI0urdKL.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.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Quality accumulator
*by L***S on 17 January 2022*

Very good quality accumulator definate value for money. Easy installation with compact design, meaning less space taken up by system installation. Excellent buy.

### ⭐⭐⭐⭐⭐ Good product
*by B***. on 29 January 2020*

It is working well after the plumber install it with the new water heater and piping. It is value for money as the price is lower than buying from the big brand 'Sxxxxfxx'.

### ⭐⭐⭐⭐ Expansion vessel
*by T***Y on 30 November 2025*

This goes alongside with my all under sink heater been in the flat now for four years and no problems with it

## 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 Belgium*
*Store origin: BE*
*Last updated: 2026-06-28*