Honeywell 22mm Auto Bypass Valve DU144A1001
Close cookie info
Don’t show this message again

This website uses cookies to store information on your computer. To give you the best possible user experience we use cookies on our website. Read more about the cookies we use in our privacy policy.

Honeywell 22mm Auto Bypass Valve DU144A1001

Product Code: L009127

(per EA ex VAT)
(inc VAT)

The DU144 Automatic Bypass Valve controls the flow of water through a bypass circuit which is installed between flow and return pipework, typically at or near the boiler. Building Regulations advice states that if a bypass is installed, an automatic bypass valve must be fitted.

The DU144 saves energy by only allowing flow through the bypass when needed i.e. when flow through the system is reduced when zone valves or radiator thermostats are closing. The use of an ABV is recommended by the UK Government as Best Practice in the CHeSS (Central Heating System Specifications) guide to central heating systems.


Unique and simple adjustment mechanism
Wide differential pressure range 0.1 to 0.6 bar
22mm compression fittings for ease of installation
Reduces system noise and maintains an even system pressure
Ensures constant flow through boiler
Lockable set pressure prevents inadvertent adjustment
Factory set at 0.2 bar

+ more

You must be logged in to leave a review.

View more... Valves

Item(s) Price: £42.86

Add For Collection

Add For Delivery

View more... Valves