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Honeywell Straight Auto Bypass Valve 22mm

Product Code: 34127

22mm. A simple means of ensuring adequate flow through boilers which require a bypass.

  • Reduces System Noise
  • High Flow Capability
  • Easy Installation
  • Ideal for Combi Boilers
  • View more information

Factory set to 0.2bar (adjustable up to 0.6bar).

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Honeywell Straight Auto Bypass Valve 22mm Instruction Manual



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Rated 1 out of 5 by Unreliable product. I can't recommend these valves. I have now had to replace mine for the second time as the two I've had both failed within two years of fitting. They both got stuck partially open causing permanent bypass. Even when brand new they were imprecise in operation and difficult to adjust correctly. I used the Honeywells as my pipe layout could only accommodate a straight valve. I've now reworked the pipework so I can use the more common angled type and the valve I've now fitted works better than the Honeywells ever did. 18 Apr 2013
Rated 4 out of 5 by Reliable Another reliable and quiet product from Honeywell if a little expensive 8 Oct 2012
Rated 5 out of 5 by Every system should have one After having problems with badly adjusted bypass ccts - a revelation. Just fit this in place of the old Gate valve, adjust for min boiler requirement and its done - maximises efficiency and prevents problematic overheating - especially when using multiple TRV's. £30 is a bit steep - but will probably save that in gas bills very quickly. Long term reliability remains to be seen - but no problem so far. 5 Feb 2009
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Download more info (pdf)

Brand Honeywell
Manufacturing Standards Building Regs Compliant
Model No DU144A1001
Pack Size 1
Product Depth 80 mm
Product Diameter 22 mm
Product Height 80 mm
Product Type Straight Auto Bypass Valve
Product Width 40 mm
Total Product Weight 0.28 kg