Ariston Kit A – 2 Litre Expansion Vessel & Non-Return Valve

Ariston Kit A – 2 Litre Expansion Vessel & Non-Return Valve (406801)

The Ariston Kit A – 2 Litre Expansion Vessel & Non-Return Valve (part number 406801) is a genuine Ariston accessory designed to protect unvented water heaters from excessive pressure and prevent backflow. This kit is essential for safe and compliant installation of Ariston Andris and Europrisma under/oversink water heaters (10L, 15L, and 30L models).

Key Features

• 2 litre potable expansion vessel absorbs expansion in the hot water system
• 15mm non-return (check) valve prevents backflow of heated water into the cold main
• Designed for use with Ariston Andris and Europrisma 10, 15, and 30 litre water heaters
• Ensures safe operation and compliance with UK water regulations
• Suitable for under or oversink installations
• Potable water-grade materials to ensure water safety
• Easy to install and maintain
• Genuine Ariston part for assured quality and reliability

Technical Specifications

Typical Applications

• Prevents pressure build-up and protects the water heater and plumbing system
• Stops backflow of hot water into the cold water main
• Required for unvented water heater installations to meet Ariston and UK standards

Choose the Ariston Kit A (406801) for safe, compliant, and reliable operation of your Ariston unvented water heater installation.

Please note: Delivery times may vary depending on location, with specific details outlined below.

Standard Delivery

UK Mainland 

• Delivery Time: 2–4 working days
• Free Delivery on all orders

Express Delivery

UK Mainland

• Delivery Time: 1–3 working days
• Delivery fee of £15

Channel Islands

• Postcodes Covered: GY*, IM*, JE* 
• Minimum Order: £50
• Delivery Fee: £70

Northern Ireland, Offshore Territories & Scottish Islands 

• Postcodes Covered: BT*, HS*, KW, ZE
• Minimum Order: £50
• Delivery Fee: £35

Same Day Delivery 

• Eligible Postcodes:
  E*, EC*, N*, NW*, SE*, SW*, W*, WC*, HA*, UB*, EN*, IG*, RM*, KT*, SM*, CR*, BR*, DA*, TW*
• Minimum Order: £50
• Same Day Delivery Fee: £60
• Special Requests or Locations:
  For areas outside these postcodes or urgent quotes, please email orders@qualityheating.co.uk and we’ll do our best to accommodate.

Collections

Want to collect your order instead?You’re welcome to do so — just email us at orders@qualityheating.co.uk or message us via WhatsApp with your preferred collection time, and we’ll confirm the details.

Collection address: 284 Water Rd, Unit 9, London, HA0 1HX