Ariston 3.5 Bar Pressure Reducing Valve - Kit B

Ariston 3.5 Bar Pressure Reducing Valve – Kit B (406802)

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

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.

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