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“We specialise in the Design, Supply and Installation of Super Energy Efficient Water Underfloor Heating Systems.”
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Commissioning A Water Underfloor Heating System

Turn a house into a home with a Central Underfloor Heating System.
MULTIZONE systems start at £1995 + VAT installed.

Bespoke Water Underfloor Heating Systems

Underfloor Heating
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Central Underfloor Heating System.

Commissioning A Water Underfloor Heating System

An underfloor heating system is straightforward to commission so long as all the components have been installed correctly.

Call 07733542299 if you would like an estimate for your project.

E-mail your plans to info@centralunderfloorheating.com

Ensure that the system is filled with water and all air is vented

The underfloor pipework is usually filled with water and pressurised before screeding but it may have been air tested if there was particularly cold weather. Ensure all the pipes are filled with water - one circuit at a time - to remove the air. Also ensure all plumbing pipework has also been filled and vented.

Ensure the screed is dry

A liquid screed floor dries in only a few days and can be force dried using the underfloor heating after about 10 days. However, a solid screed must be at least four weeks old and slowly heated up thereafter before any floor is laid. This avoids cracking and curling of the screed and any moisture becoming trapped between the screed and the floor finish. A biscuit mix screed on suspended floors should be given about 3 days to dry out.

Ensure other systems using the same boiler have a zone valve and timer

An underfloor heating system won't operate correctly unless it can operate independently to other underfloor heating systems, radiators or hot water cylinders using the same boiler. Ensure that the timer on a combination boiler is disconnected as well.

Ensure an expansion vessel is fitted on the return pipe to the boiler

Ensure that an appropriately sized expansion vessel has been fitted. NB. Underfloor heating pipes contain 0.121 litres of water per metre length.

Add antifreeze/inhibitor

Antifreeze/Inhibitor such as Fernox Alphi 11 or CURA Inhibited Antifreeze should be added to the system at the recommended concentration. NB. Underfloor heating pipes contain 0.121 litres of water per metre length.

Set the mixing valve

A solid floor will need a mixed water temperature of between 40 and 50 degrees Celsius. The lower the temperature used, the more efficient the system will be, so try and set the mix temperature as low as is possible to achieve the required output. A suspended floor will need a mixed water temperature of 50 to 60 degrees Celsius. Again set the temperature as low as you can get away with for maximum efficiency.

Set the room thermostats

The room thermostats should be set to the desired room temperatures. Underfloor heating usually allows you to set a desired temperature of a couple of degrees less than what you would normally expect to need in a room heated by radiators. This is due to the more comfortable nature of underfloor heating.

Set the "Setback" temperature

The room thermostats should be set to the desired room temperatures when the rooms are in use and then a setback temperature when they are not. It is more efficient to keep an underfloor heating system ticking over than to let it go completely cold and heat it back up from cold. A setback temperature is usually 4 to 8 degrees less than the on temperature. Programmable Room Thermostats need to have setback temperature programmed in to them in the same way as on periods. Dial thermostats are wired in so that multiple thermostats (on a choice of two different time channels) can be programmed to have fixed temperature setback periods using a single time clock.

Check the system is operating correctly

It's best to set one thermostat at a time and check that when the thermostat calls for heat the following occurs:

The zone valve opens and the pump starts. (The pump should be set at 3 whilst testing.)
The boiler fires.
The appropriate actuator(s) for that the circuit(s) for that room opens. An actuator takes three or four minutes to open fully.
Once the actuator is open a flow is indicated by the red marker in the corresponding flow meter directly below.

After all the thermostats have been tested in turn set all the thermostats to call for heat and after a few minutes ensure that the mix temperature is in the correct range. Read the temperature gauge on the flow bar of the manifold and adjust the mixing valve if necessary.

Call 07733542299 if you would like an estimate for your project.

E-mail your plans to info@centralunderfloorheating.com

Underfloor Heating Cost Manifold

Underfloor Heating Cost Suspended Floor

Underfloor Heating Cost Controls

Underfloor Heating Cost Solid Floor

Underfloor Heating Cost Installation

Underfloor Heating Cost Pipes

Underfloor Heating Cost Compact Manifold

Underfloor Heating Cost Large House

Underfloor Heating Cost Large Houses
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We supply and install WATER UNDERFLOOR HEATING systems nationwide.

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