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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. S

    Pump to powerful or faulty zone valve?

    Evening folks, got an issue with a newly upgraded heating system I carried out. To cut a long story short, the cylinder in airing cupboard( 200 litre open vent) wilo 25 1-8 pump next to cylinder on an S plan, Honeywell 22mm zone valve for h/w and 2 x 22mm zone valve ( one for u/s heating and one...
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  2. M

    Hot Water Zone Valve Problem !

    I have an ongoing problem with a hot water zone valve that I've currently been unable to resolve despite replacing it twice ! The customer has an S plan system connected to a gas fired rayburn and called me because they only had hot water when the heating was ON. I checked the zone valve...
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  3. N

    Honeywell two port 2-port heating zone valve x3

    Selling x3 honeywell 2-port valves 5-wire £40 each cash on collection from north london add on guntree too Honeywell Two port 2-port zone heating valve | United Kingdom | Gumtree
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  4. S

    Two port zone valve on cylinder return

    Come across some of these recently, usually only ever see them on the flow to the cylinder, not on the return from it. Any reason for this? Does it make any difference as still won't be any flow unless there is a call from the cylinder stat?
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  5. G

    Zoning an old CH system... zone valve placement?

    Hi all, I'm planning a mild upgrade my parents old gravity fed (fully pumped) oil-fired central heating system over Easter. The current setup is rather strange - "non standard" shall we say? This is a rough mock-up of the current plumbing setup: Notice there is no open vent pipe, just a...
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  6. M

    3 port zone valve question

    I turned my heating on for the first time this year and found that although the hot water is OK, there is no heating. The boiler doesn't kick in when I turn up the thermostat. I checked the zone valve switch which slipped so I changed it. However I noticed that the spindle which operates the...
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  7. B

    Camray 5 combi danfoss zone valve

    Hi Guys, Went to change head on a danfoss three port today and the old valve had 5 wires and the new 4? tried wiring to the best of my knowledge but no luck! please help or just tell me im being stupid! Cheers
    • Beboers
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  8. M

    Zone valve position indirect cylinder

    On a heating system linked to indirect hot water cylinder (S plan plus underfloor heating zone, 1st floor heating zone and circs to hot water cylinder). Were the boiler would be in the garage and cylinder in the loft. Would it be best to have the zone valve on the flow to the cylinder in the...
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  9. D

    Banging when HW zone valve shuts

    Alright lads looking for some advice. Had a situation where every time the hot water zone valve shut there was a loud bang. The customer said this also happened last thing at night when heating goes off too but didn't happen with central heating valve when I was there. It's an open vented...
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  10. N

    Heating not turning on - problem with zone valve?

    Hi all, Discovered a problem with our central heating not working yesterday, I am a plumbing newbie though so please treat me gently! We have a Baxi 80 HE plus combi boiler, with what looks like a s plan system with a pair of Honeywell V4043 valves attached to separate heating and hot water...
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  11. T

    refilling system & zone valve position

    Hi, is the dhw zone valve in the wrong spot here, before the cold feed & expansion? The cylinder was fitted approx 10 years ago, not benchmarked, not informed of the need for an annual service & the 22mm safety discharge pipe was about 25metres long with numerous bends! By the state of the...
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  12. A

    Zone valve

    what is the 6th wire on a honeywell zone valve is it as i suspect not used on a w plan and can i wire a replacement 5 wire to an existing 6 wire zone valve also is the motor and mechanical fitting on a 22mm vone valve the same as a 28mm got a 28mm 6 core motor to replace, and today just...
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  13. A

    zone valve issues

    hi guys looking for some technical advice just replaced a drayton ZA5 actuator valve head as when the customer was putting the hot water on they were getting heating aswell the problem ive found is that the valve stays open constantly, when power is cut to the system it closes but when i switch...
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  14. B

    zone valve

    has anyone used the corgi zone valve heads from toolstation they say they fit Honeywell - they are half the price of the Honeywell ones
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  15. P

    Zone Valve positioning

    Hi, I have just bought a new house, the heating is shot which I knew so we are ripping it out and starting again with a combi and a 2 zone system (upstairs and down) The existing installation had the boiler upstairs in a cupboard but we want are going to move it downstairs to what will be the...
    • prs999
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  16. I

    Zone valve or not?

    Evening all I've been asked to pice up a replacement boiler for a servowarm 50 so I'm thinking of a Wb 15ri my question is the cylinder is heated via immersion heater as are all the rest of the flats concrete floors means it'd be a nightmare to heat it via the boiler so as the boiler is only for...
    • Irish
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  17. B

    Terrier Zone Valve Issue

    Hi everyone, I'm a newbie to this site and a newbie to plumbing so please speak in laymans terms!!! Basically, all radiators upstairs stopped working a week ago. We have two heating zones in the house. The thermostats seem to be working correctly. so I googled my problem and came across plenty...
    • Bungeebutt
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  18. P

    zONE VALVE REQUIREMENTS

    Hi Chaps its been a while since i posted on here but i have a query regarding zone valves. Im sure i have read or been told that all houses over 150 sq m has to bee zoned but you cannot use a 3 port valve but you have to use 2 port zone valves, Why is this? Cheers
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  19. F

    2 zone valve heating system , wiring advice needed

    Hi guys , I need a bit of advice on wiring a S plan 2 zone valve heating only. Basically it's a Remeha 30s , the boiler is used for heating only. The costumer want to controll the zones separately by 2 wireless room thermostats. I suppose it's not that different from normal s plan but I just...
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  20. R

    2 port zone valve question...

    Hello, quick question! I was asked to look at a problem with a hot water system today, however when I got there I found it to be an indirect cylinder that was doing the hot water and a worcester combi doing the heating. I had a quick look round, checked the immersion for power and then noticed...
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