40103SM3

Radiant Control 3-Port Mixing Valve

Lifetime Technical Support

Fast UK Delivery

Design Services Available

Trusted for over 20 years

Have a large project?

With our design services, we can give you a bespoke and accurate quote. Just fill out our quotation form and one of the team will get back to you!

Product Description

The Radiant Control 3-Port Mixing Valve is a precision-engineered regulation valve designed to accurately blend hot supply water from the boiler with cooler return water from the heating circuits. Specifically optimised for underfloor heating (UFH) and radiant floor systems, this 3-way valve lowers high boiler temperatures to a safe, efficient level before fluid enters the floor grids.

Manufactured from high-grade brass, it is fully compatible with fixed-point thermostatic control heads or motorised electronic actuators. It ensures excellent hydraulic balance, constant flow temperature control, and a prolonged lifespan for underfloor pipe networks by preventing thermal shock.

Key Features & Benefits

  • Precise Temperature Regulation: Efficiently mixes flow and return water to maintain consistent, low-temperature water for underfloor networks.

  • Control Versatility: Seamlessly adapts to standard thermostatic heads (for fixed-point control) or electronic actuators (for weather-compensated setups).

  • Protects Pipework Integrity: Prevents high boiler temperatures from entering floor screeds, mitigating structural cracking and protecting pipe materials.

  • Heavy-Duty Construction: Built with a premium brass body rated to handle high static pressures of up to 10 bar.

  • Wide Adjustment Window: Tailored for underfloor heating systems with ideal temperature range compatibility between 15°C and 60°C.

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We want to make sure your order gets to you as quickly and smoothly as possible.

  • Next Day Delivery (England): £9.99

  • Next Day AM Delivery


Orders placed before 12:00 pm qualify for next working day delivery, with drop-offs generally scheduled between 8:00 am and 5:30 pm.

  • Pallet Delivery (Mainland UK): £72.00

    Required for heavier or bulkier items.

Important Cut-Off Times & Weekends Any orders placed after 12:00 pm on a Friday—along with orders made over the weekend—will be packed and dispatched on Monday for delivery on Tuesday. Please also keep in mind that bank holidays are classed as non-working days when calculating your delivery dates.

Need a Custom Option? If you need a specific timed delivery, have a non-mainland address, or require something outside our standard shipping options, get in touch with our team and we will do our best to help.

Please note: While we work closely with trusted couriers to ensure reliable, on-time arrivals, rare delays can occasionally happen. We always advise having your physical materials on-site before booking tradespeople to avoid any unexpected downtime or costs.

Get in Touch

If you have any questions about your delivery or need tracking assistance, our team is ready to help:

  • Email: sales@radiantcontrol.co.uk

  • Phone: 01530 519666

  • Opening Hours: Monday to Friday, 8:30 am – 4:30 pm

Trade Accounts

Are you a regular customer with a buying history, a home builder, installer, or merchant?

We offer trade accounts with exclusive pricing on our range of products as well as a range of services.

Click here to apply for your trade account!

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