The Ariston 3.5 Bar Pressure Reducing Valve – Kit B (part number 406802) is a genuine accessory designed to protect unvented water heaters by controlling incoming mains water pressure. It is essential for installations where the mains pressure exceeds 3.5 bar, ensuring safe and reliable operation of Ariston Andris and Europrisma water heaters (10L, 15L, and 30L models) under or oversink.
This kit is recommended or required for compliance with Ariston installation guidelines and UK water regulations.

Key Features

• Preset to limit water pressure to a maximum of 3.5 bar
• Prevents over-pressurisation and protects the water heater and pipework
• Includes integrated check valve, pressure relief valve, and filter for added safety
• Compatible with Ariston Andris and Europrisma 10L, 15L, and 30L unvented water heaters
• 15mm compression connections for easy installation
• Durable brass construction
• Genuine Ariston part for assured quality and reliability
• 1-year manufacturer warranty

Technical Specifications

Manufacturer	Ariston
Part Number	406802
EAN / GTIN	5411692702014
Max. Inlet Pressure	Controls to 3.5 bar
Connection Size	15mm compression
Material	Brass
Compatible Models	Ariston Andris & Europrisma 10L, 15L, 30L (under/oversink)
Weight	Approx. 1 kg
Warranty	1 year

Typical Applications

• Protecting unvented under/oversink water heaters from excessive mains pressure
• Ensuring compliance with Ariston installation requirements and UK water regulations
• Suitable for domestic and light commercial use

Choose the Ariston 3.5 Bar Pressure Reducing Valve – Kit B (406802) for safe, compliant, and reliable operation of your Ariston unvented water heater installation.