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PostPosted: Sun Jul 22, 2018 12:25 pm 
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Looking for new house, told today central heating split into zones, not a clue why? But also don't know how connected to boiler.

I would guess the micro switches in the zone valves connect to a device which in turn tells boiler to run at 50% with one zone active, and 100% with two zones active, however I can't find such a device for sale.

I will admit I made a mistake with this house, I used eTRV heads, but found only way to link with thermostat is with IFTTT with follow commands so all set to same temperature which defeats whole point of programmable heads. Seems I should have used some thing like EvoHome where the thermostat is really a hub which tells the boiler the output required.

I had not realised my boiler is not Opentherm enabled so the clever thermostats have to be made by Bosch and these it seems don't link to eTRV's so had to use a Heath Robinson method. Having made the mistake once, I want to avoid a repeat.

So if the house has zone valves what would one need to do to get full control? Would they need removing?

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PostPosted: Sun Jul 22, 2018 12:31 pm 
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Don't know if it helps, but I have seen zones used for UFH
Lots of rooms each with own UFH
Each valve is controlled by a room stat in said room

No idea about what the boiler does, I was there for another reason and that was what I saw and was told thats what it does.

Fret not, a forum is a collection of opinions. Above, are mine.

Which is correct? Metre or Meter? Click the link to find out more.

Working on anything electrical? have you got a multi meter? why not? Would you hit a nail with a shoe?

If gloom had a voice, it would be me. :mrgreen:

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PostPosted: Sun Jul 22, 2018 12:32 pm 
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better asked in CH . I'll move it

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PostPosted: Sun Jul 22, 2018 3:44 pm 
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zone valves are simply a syncro motor attached to a valve body a 2 port valve will have 2 positions open and closed, 3 wires neg, and a positive for each position and power to the motor

it all depend on the zone setup what type of valves/manifold, how many zones and if you want to go wire or wireless with a controller

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PostPosted: Sun Jul 22, 2018 5:39 pm 
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The boiler flow temperature is the same regardless of how many zone valves are in use/open.

Your boiler would need to support OT and be connected to an OT thermostat to vary the flow temperature depending upon demand and room temperature.

It would also need some means of overriding the OT when there’s a hot water demand, such as Pin 5 on Intergas or a four pipe boiler that has the diverter valve built in it such as the Vaillant new ones


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