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Discuss Will my UFH require its own zone valve? in the Water Underfloor Heating Installations area at PlumbersForums.net

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10
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 my proposed setup will work or whether in your expertise I am likely to need to reconfigure to avoid a poor performing heating system. A little information regarding my proposed heating system:

Boiler – Ideal Logic+ 35kw Combi Boiler
Zone Valve 1 – Downstairs Rads
Zone Valve 2 – Upstairs Rads (Inc UFH and towel radiator within the Bathroom)

The UFH will likely be the single zone kit linked below albeit with the included stat omitted/not used within my install and will instead rely on the programmer/smart stat controlling zone valve 2 to control the UFH and the upstairs rads as one.

10sqm-single-zone-water-kit - https://pswtradesuppliers.co.uk/single-room-water-kit/141-10sqm-single-zone-water-kit.html

I would be interested to hear your thoughts on the above as to whether the 2 zones will work or whether I am likely to require a third independent zone solely for the UFH system to be controlled by the thermostat included with the UFH kit.

Thank you in advance for your assistance,

Russ
 

ShaunCorbs

Staff member
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Plumber
Gas Engineer
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Yes needs it’s own zone unless going electric matting wouldn’t go with the kit you’ve linked tho
 

EvilDrPorkChop

Gas Engineer
Messages
759
You won't be able to tap into the 'Zone 2' you'll need an additional zone that's independent of anything else with flow and return pipework from the boiler (Or wherever your zone valves are)
 

ShaunCorbs

Staff member
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One because it’s cheap unbranded gear so spare parts good luck

two it’s for a ground floor before the screed has been laid as it’s upstairs you would need an overboard system
 
Messages
10
One because it’s cheap unbranded gear so spare parts good luck

two it’s for a ground floor before the screed has been laid as it’s upstairs you would need an overboard system

Thank you again for your response, I will look at sourcing an alternative system, are you able to suggest/recommend?

My plan is to lift to lift the existing floorboards to expose the floor joists and install pre grooved insulation boards (linked below) before renewing the bathroom floor with 22mm cement board therfore negating the requirement for an overboard system.

 

ShaunCorbs

Staff member
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Plumber
Gas Engineer
Messages
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The ones you’ve linked arnt a structural board so you would need to fill in the joist space with ply to span

over kit


Structural


Wouldn’t recommend you overboard with cement board as it’s an extra layer if you want tiles infill with ply then use a cement overboard eg the kit above (overboard)
 
Messages
10
Thank you, will have a thorough read of the links you provided over a cuppa on the morning.

Just to clarify, the pre-grooved insulation boards I linked previously woudnt be used as structural floor, they would be installed inbetween joists with the top face (where the UFH pipes are run) sitting level with the top of the joist which would allow the 22mm cement board to act as the structural floor with being laid ontop of and fixed into the joists whilst simultaneously sitting ontop of the UFH pipes and conducting heat through to the tiled floor.
 

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