Underfloor Heating Kits

To answer the many questions about our warm water underfloor heating systems and products, we’ve compiled a handy list of the ones most frequently askedIf you can’t find the answer to your question below please contact us and we’ll  be happy to help.

How deep should the insulation board be?
65mm is the recommended minimum depth but if your floor allows for a deeper board then do so. The deeper your insulation is the less heat you’ll lose, making your underfloor heating more effective and efficient. If floor depth is limited and doesn’t allow 65mm then use the deepest board you can. We strongly recommend against using less than 25mm.

How deep should the screed be?
65mm is the recommended screed depth. Any more than this and you greatly increase warm up times and wasting energy. 65mm provides an ideal heat storage platform and greater efficiency and effectiveness of the system.

What is the heat output?
In screed the heat output is 100w/sqm. On wooden floors 75W/sqm at 65mm depth.

Can I use block and beam as a sub-floor?
Yes. This works perfectly well with our wet underfloor heating systems.

Can I install the system myself ?
Yes. Some understanding of plumbing and electrics will be required for the boiler connections and thermostats but for the most part installing a system is straightforward enough for DIY. The part of the installation that you may not be able to do yourself is when the system needs to be pressurized correctly which can be done by yourself if you have the correct tools or by a qualified plumber, which we do recommend. We also recommend the final electrical connection is done by a qualified electrician for safety reasons.

How do I pressurize the system?
By passing compressed air through the system and testing the reading with a compression gauge using a Rothenberger RP50-S or similar tool. Pressuring the system needs to be done before passing water into the system. We highly recommend using a plumber or qualified installer for this since.  Getting this part wrong can reduce the effectiveness of your underfloor heating considerably, causing cold spots and poor efficiency. Pressurizing the system also shows if you have any leaks before you pass water into it.

When purchasing a kit, will I need anything else?
You will need to purchase insulation board which can be bought from any local builders merchant. If you intend to use screed then you will need to contact a screeding company who will supply this based on the total floor area to be covered. If you are installing the underfloor heating system on joisted floors, you will need to purchase insulation board and the required number of aluminium spreader plates (2.5 plates/sqm).

Why do I need insulation board?
Thermal insulation board is one of the key components in underfloor heating. It acts as ground insulation, prevents heat from being lost downwards and reflects heat from the underfloor heating upwards into the room. Insulation board is also used to clip the pipe into place using the barbed pipe clips.

What is screed and why do I need it?
Screed is a sand/cement concrete mix which is poured wet or packed dry on top of the pipework and is the basis of how underfloor heating works. Since the pipe itself does not radiate the heat very far it needs a way to store this heat output collectively to be effective. This is the purpose of the screed. The underfloor heating pipe heats the screed surrounding it which acts as a solid heated element which, combined with the reflective qualities of the insulation board below, then radiates the heat upwards as a single heat source across the entire floor. This is the same effect when using aluminium spreader plates- the plates become heated by the pipe which then radiate the heat upwards into the room.

Typically, insulation board is laid down first onto the sub-floor. The underfloor heating pipework is then clipped into the insulation board and the screed then poured on top to cover the entire floor. Once the screed hardens the floor is then covered with a wooden base and your chosen floor covering (carpet, tile, wood, stone) is then placed on top.

How much maintenance does underfloor heating require?
None. Underfloor heating systems are completely maintenance free. Providing installation has been done right and the system has been pressurized correctly everything will work perfectly with no maintenance required.

How hot does the floor get?
Between 26-28 degrees C

Can I turn off my underfloor heating completely?
Yes. In the same way you can turn off your radiator system by turning the thermostat right down, your underfloor heating system works in the same way. Simply turn the underfloor heating thermostat off and the system will turn off. For screeded floor allow approximately 45 minutes to completely cool.

Is there a warranty?
Our underfloor heating systems come with a 5 year warranty

Are there any guarantees?
Heatmiser offer a 2 year guarantee with all of there heating controls. Our pipe has a 50 year guarantee.

What are zones?
A zone is an individual circuit of continuous pipe without joins no more than 100m in length from output to return on the manifold. The heat output in each zone can be controlled individually by its own thermostat or as some prefer, 1 thermostat controls all zones.

A zone is not the same as a room. A room can be split into several zones. If a room requires more than 100m of pipe it will effectively need to be split into 2 zones, or more if it requires more than 200m of pipe. A large office room could be split into 6 zones for example if it needed 600m of pipe to cover the floor.

Single zone kits only have the functional capabilities to serve one zone, which might be split between a bedroom and bathroom. Multi-zone kits have the functional capabilities to serve several zones and the size of the manifold will determine how many zones can be served. 2 port manifold serving 2 zones, 3 port manifold serving 3 zone, and so on.

Why should a zone not exceed 100m of pipe?
Beyond 100m of pipe length the pumps cannot get the hot water effectively around the system resulting in cold spots and poor heat output. For an effective underfloor heating system we highly recommend you do not use more than 100m of pipe length per zone.

What’s the total area a pump unit serve?
Our multi-zone underfloor heating pump units fitted with A-rated 15/60 Grunfoss pumps can adequately serve up to 140sqm of underfloor heating.

I want to use the Heatmiser wifi controls. What do I need?
Your building needs to have a 230/240v supply, an Internet connection with wifi router, Heatmiser wifi thermostats and the Multilink.

My home has a 230v supply. Can I still use the Netmonitor and Touchpad?
No. The Netmonitor and central touchpad require a low voltage 12v supply and are the alternative to using the wifi controls.

Is there an alternative to using aluminium spreader plates?
Yes. You can use a dry screed to cover the pipes packed on top of insulation boards set between the joists.


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