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

Manufacturer	Ariston
Part Number	406801
EAN / GTIN	5411692702007
Expansion Vessel Capacity	2 litres
Check Valve Size	15mm compression
Compatible Models	Ariston Andris & Europrisma 10L, 15L, 30L (under/oversink)
Weight	Approx. 1.5 kg
Warranty	1 year

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.