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zone valve

A zone valve is a specific type of valve used to control the flow of water or steam in a hydronic heating or cooling system.
In the interest of improving efficiency and occupant comfort, such systems are commonly divided up into multiple zones. For example, in a house, the main floor may be served by one heating zone while the upstairs bedrooms are served by another. In this way, the heat can be directed principally to the main floor during the day and principally to the bedrooms at night, allowing the unoccupied areas to cool down.
This zoning can be accomplished in one of two ways:

Multiple circulator pumps, or
A single circulator pump and zone valves.

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  1. M

    Controls and zone valve

    Is there anyway of testing electrically with a multimeter or any other way. Of testing that when you turn a room stat up it is creating a demand and opening the zone valve? Thank you
  2. I

    Zone valve Flow Direction may be incorrect - Advice required

    Hi, first time plumber and poster here. I've installed two new zone valves and replicated the direction inwhich the original valves were installed. I'm really confused now as I think the originals may have been installed the wrong way round. The Grundfos pumps' arrow is pointing down whereas my...
  3. F

    Broken zone valve for downstairs heating?

    Hi all, Hoping to check if I have a genuine fault, or something I've overlooked. I've just moved into a my first house with a conventional boiler and hot water tank. The heating system has two heating zones (upstairs / downstair). Currently with both thermostats up high and the heating zones...
  4. J

    2 way 2 zone valve question.

    Hi I have a honeywell programmer which does 10 min cycles but with the zone valve fitted it is closed during a 4.5 min long pump only cycle. Is there a way to stop this and only close when pump stops. It is open during heat and pump part but you can gradually loose a warm rad with it not...
  5. A

    Zone valve and gas bills

    Hi all I have been noticing that my gas bills have been excessively high even in the current climate …I did a little investigating and found my unvented heating system only has one 2 port zone valve controlling the hot water. My question is could this be what is causing the high bills as there...
  6. Daaave

    Fitting zone valve query

    Hi all, I have a 28mm zone valve for a C Plan I want to fit and would appreciate some advice please. I’m looking for the best way to adjust the existing pipework - my idea is to fit the valve at the green circle, tee off beneath it for the vent pipe and cap off the reducer at the cylinder...
  7. J

    3 port zone valve question

    Can a three port zone valve allow circulation through both rad circuit and cylinder coil at same time or does one circuit take priority??
  8. J

    Zone valves & burner light?

    Hi all, For my boiler worcester bosch greenstar 30Kw Ri Compact, I noticed that, within programmer set time, for heating, if the house temperature has reached set temperature say19°C, the zone valve for heating will close, the boiler's a burner light (green) will be off, and blue light is off...
  9. J

    Zone valve - replacement head?

    Hi all, Does anyone know if you can replacement heads for this zone valve? And if so, can you replace the head only (without having to drain the heating pipes)? Thanks Jennie
  10. T

    Honeywell normally open zone valve

    Interesting question and one I’ve never even thought about until I messed up today. This might be a bit long…. I’ve got a multi fuel system on the go, gravity primary’s for hot water off Rayburn, big biomass boiler, air source is involved for the floors , pumped heating split into 5 zones blah...
  11. F

    Honeywell 2 port zone valve not turning on

    There's power going to the valve head but the motor won't activate to turn the spindle to open the valve. The manual override will not activate the valve either. Should I replace the valve powered or Whole valve unit with pipe/spindle attached. My initial thinking the valve motor died and I...
  12. C

    Zone valve query

    Hi I have 3 zone valves, one per floor. I am having an Evohome system fitted so that I can get better control over the room temperatures. The exisiting zone valves will no longer be required and so it would make sense for them to be removed and replaced by pipe. The main issue is that a...
  13. R

    Will my UFH require its own zone valve?

    Hi, New member here looking for a little advice in regards to a wet UFH system. I am currently in the process of a refurbishment project to my soon to be new home renewing the central heating system throughout the property, I would like to add UFH to the bathroom but would like to know whether...
  14. MikeJhn

    Zone valve replacement

    Do you guys find there is a definitive life for Zone valves, there is for the synchronous motors, but what about the movable valve?
  15. Meady

    Honeywell 22mm V4043 2 port zone valve for sale

    I have 11 of the above for sale, all are brand new and in the original box. Looking for £40 each posted for them. Cheers 1596736173 10 already sold, just the 1 left now. Cheers
  16. N

    Hot water zone valve issue

    Hi I’ve been having problems with my boiler tripping my electrics For a while which has got worse.. I now have no hot water and my boiler won’t turn on for more than 5 Mins without tripping. A gas engineer attended yesterday and said it was water damage from the pipes and the hot water zone...
  17. A

    Danfoss zone valve wiring

    hi All, i am blocked on an issue: connecting Danfoss AMZ 112 (230VAC) ball zone valve to Heatmiser UH4 wiring center,seems wiring center turns ON the valve (open) when room stat calls for heat, which is fine, but when room stat stops calling for heat, wiring center does not close the valve...
  18. M

    54mm zone valve and auto bypass

    I need to fit a zone valve to some 54mm copper heating pipework, I also need to fit an auto bypass. Can anyone recommend a brand to use? Also the best place to buy for the cheapest price etc. I dont do a great deal of commercial work.
  19. A

    Giacomini motorized valves

    Hi all, does anyone have experience in Giacomini motorized zone valves? Are they reliable?
  20. A

    Mixing group conflict with Zone valve?

    hi All, can someone help me clarify following issue? is there possibility when room stat calls for heat (UFH system), it opens the zone valve, runs the manifold pump and turns on the boiler but the mixing group does not start mixing the incoming hot water and does not allow the incoming hot...
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