Underfloor heating

Underfloor heating FAQ

Underfloor Heating FAQ

What is a zone?
It’s an area that you wish to control independently via a room thermostat.  It can be one room or multiple rooms but most commonly one.

What is “water temperature control” WTC?
This is used when the supply water temperature from the heat source is too high for the underfloor heating.  Typically a screeded floor system requires an average water temperature of 40°c.
 
What type of room controls should I use, radio or wired?
Each has an advantage over the other.  Radio gives you the freedom to re-position your thermostats and it also cuts down on material and labour costs.  Wired has a permanent power source and does not use batteries.
 
I have an existing radiator system, can I still use underfloor heating in an area?
Yes you can, it’s very likely that you would require either a diverting valve or a two port zone valve to isolate the two different systems.  It’s also likely that the underfloor heating will require water temperature control so as to reduce the higher water temperature that is typically required for a radiator system.
 
What is a manifold?
A manifold is a central distribution point where the underfloor heating loops are connected to.  It’s also used for control and isolation of the flow of water so that loops/zones can be independently controlled.
 
Where should I position my manifold?
Ideally in the most central point that gives the most economic distribution of pipework.  However if it’s just a single zone then it is best to position it within that area or as close as possible.
 
What thickness of floor insulation should I lay?
This should be sufficient to satisfy building regulations Part L.  Typically 100mm of high density floor grade PUR board is deemed sufficient.  Please check with building control prior to installing.
 
What happens if I damage the pipe?
Uponor can supply compression couplers that can be used to join the pipe together.  Any joints within the floor should be suitably protected from the screed and if possible they should be made accessible.
 
What type of finished floor coverings can I use?
It’s possible to use any type of floor covering provided the thermal resistance does not exceed the British Standard BSEN1264.  For a wooden floor or similar the thermal resistance should not exceed 0.15m²k/w.   For carpets and underlay the combined tog value should not exceed a value of 2.  Tiled floor finishes are well suited for use with underfloor heating as they have little if any thermal resistance.
 
Can I lay underfloor heating underneath kitchen units and sanitary items?
You can lay underfloor heating underneath kitchen units provided there are no floor fixings being used that could potentially damage the pipe.  It’s recommended that you lay underfloor heating across the total floor area as the kitchen layout could change in the future.  Underfloor heating is not normally placed under sanitary units as they are commonly fixed to the floor and could potential cause damage to pipes.
 
Where can I buy spares for my Underfloor Heating?
You can purchase spare directly from Uponor Ltd. Telephone 01923 927000