Leave us a message...

Online Chat is unavailable at the moment. If you send us a message, we will get back to you as soon as we can. Alternatively, please feel free to give us a call on 01686 621770 within office hours.

Leave us a message...
Honeywell DU145 Automatic Bypass Valve View larger

£ 36.99 inc VAT

Honeywell DU145 Automatic Bypass Valve

DU145 – 3/4B

New product

1 Item

In Stock (Order Weekdays By 4.30pm For Next Working Day Delivery)*

Honeywell DU145 Automatic Bypass Valve - The Honeywell DU145 Automatic Bypass Valve is a 22mm Angled Type Valve.  The use of Automatic Bypass Valves (ABV’s) becomes particularly important when Heating Systems include large numbers of Thermostatic Radiator Valves (TRV’s) – such as evohome’s HR92UK Radiator Controllers.



More details


More info

More info

Honeywell DU145 Automatic Bypass Valve

DU145 Automatic Bypass Valve box contains:

  • 1x DU145 Automatic Bypass Valve (22mm Angled Type Valve)

The Honeywell DU145 Automatic Bypass Valve controls flow of water through a bypass circuit which is installed between flow and return pipework, typically at or near the boiler. Building Regulation advice states that if a bypass is installed, an Automatic Bypass Valve must be fitted.

The DU145 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
  • High capacity flow – up to 50 litres per minute
  • 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

If you have any questions about the Honeywell DU145 Automatic Bypass Valve, please feel free to Contact Us. 

Also purchased

These products has been purchased together with current product