Honeywell Home Straight Auto Bypass Valve 22mm (34127)

£ 51.49INC VAT

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Honeywell Home Straight Auto Bypass Valve 22mm (34127)

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

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View all: Honeywell Home Flues & Boiler Accessories

£51.49INC VAT

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Rated 2 out of 5 by from Stuck open I'm having to replace after <5 years as the valve has stuck slightly open so consequently there is a permanent bypass even when fully tightened. Disappointing on an expensive part. It is fitted after the filter on a clean system so shouldn't be due to debris. Will replace with the generic £11 version and see how we get on.
Date published: 2021-01-07
Rated 1 out of 5 by from Poor quality Had to replace before 6 months due to sticking. Do not recommend.
Date published: 2019-07-20
Rated 5 out of 5 by from quality product easy turn adjustment and cap to prevent alteration os set value
Date published: 2017-03-08
Rated 5 out of 5 by from PROFESSIONAL REVIEW These valves are all that my heating company use. They're top quality and have never let us down. I read a review that they stick? ALL valves stick in a dirty system. These have never let us down and we'll continue to purchase. My only complaint is that they're next day so not available off the shelf.
Date published: 2016-12-27
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system type? open/sealed

Can this auto-valve be used for a bypass on both sealed and open-vented systems?
Asked by: Alanqwerty

Possibly damaged item

Having rejected one of these due to an indent on the adjuster knob, I'm surprised to find the same on the replacement - are these indents intentional, or indeed damage?
Asked by: zion
Contrary to honeywell's own answer... I believe the indentation is simply to prevent the knob from being twisted off. The number marking/reading explanation doesn't make sense: they are marked with lines all the way round the body under the screw knob.
Answered by: Alanqwerty
Date published: 2021-02-07

can these valves be used in either horizontal or vertical pipework.

Asked by: drafter
The DU144 should be fitted immediately after the pump between the flow and return. Pipework should be 22mm to accommodate maximum capacity and flow must be in the direction of the arrow marked on the body. So as long as the flow is in the direction of the arrow it can be installed horizontally or vertically.
Answered by: Honeywell Home Consumer Support
Date published: 2019-09-25

Can I replace a DU146 (Honeywell) bypass valve with this item?

Asked by: sparkidave
Yes.
Answered by: Honeywell Home Consumer Support
Date published: 2021-07-30
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Specification
Brand Honeywell Home
CE Standard (Tested to EN...) EN 1254-1.
Manufacturer Guarantee 1 Year Guarantee
Pack Size 1
Pieces in Pack/Case 1
Product Diameter 22 mm
Product Type Straight Auto Bypass Valve

Downloads

Instruction Manual