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Underfloor Heating

The perfect partner for an Air Source Heat Pump is Underfloor Heating. This is because Air Source Heat Pumps are more efficient the lower the water temperature and as Underfloor Heating operates at lower temperatures than radiators, it is clear why it is a perfect match.

Underfloor Heating has a more even distribution of heat since there is pipe in the floor evenly spaced that emits a nice gentle warmth that gives a warm floor which gets cooler at ceiling height. Underfloor Heating is typically more efficient than radiators as it operates on lower temperatures and it also frees up valuable wall space.

There are a number of installation options available and at Untiherm, we have the solutions to meet with the building.

Please find detailed below the floor construction details and core components for Unitherm’s range of warm water underfloor heating systems:

UNI-STAPLE

UNI-STAPLE - The staple system provides a quick, flexible and simple method of securing the underfloor heating pipework when laying a screed floor. The staples have a barbed end which fixes into the insulation. To speed up the process further a pipe stapler is available. In preparation for certain screeds, a polythene sheet/membrane may be required over the insulation prior to stapling the pipe.

UNI-CLIPTRACK - The cliptrack system provides a quick, flexible and simple method of securing the underfloor heating pipework when laying a screed floor. The Cliptrack can either be barbed or have an adhesive back which fixes into the insulation. In preparation for certain screeds, a polythene sheet/membrane may be required over the insulation prior to stapling the pipe.

UNI-PANEL

UNIPANEL-12 - This compact panel is design for applications on a solid slab/screed. It has an adhesive layer on the underside to ensure no movement when the screed is poured. This design enables very thin screeds to be poured over the panel to give the lowest possible build up – just 5mm above the panel for tiles floors and 9mm for any other finishes.

UNIPANEL-16 - This panel system comprises of a series of interlocking castellated panels which have been designed to avoid using cliptrack and staples in the floor and to speed up the installation of the underfloor heating system. Standard sand/cement screed of 65/75mm or a specialist thinner anhydrite or liquid screed.

UNIFIT FOILBOARD

UNIFIT FOILBOARD – This low profile, low weight, adhesive system is ideal for all types of installation especially where the floor height is a premium. The panel is pre-grooved, a foil reflective layer is then heat-adhered to produce an effective high output panel. When used with MULTITOP which has an in-built decoupling layer which gives the perfect finish for any floor covering.

UNIFIT JOISTPLATE

UNIFIT JOISTPLATE – This low height, low weight, adhesive system is ideal for all types of installation especially where the floor height is a premium. The panel is pre-grooved, a profiled aluminum sheet diffusion layer is then placed over with the pipes pressed into position. This high conductivity product will then be ready to accept carpet, wood, tiles or even vinyl.

UNIFIT CHIPTOP

UNIFIT CHIPTOP – This structural heating board gives rapid even heat distribution, dry construction and is fully recyclable. With a 22mm thickness, a 6mm flooring grade ply would need to be bonded and mechanically fixed to the chipboard prior to any floor covering. This can be installed on solid, joisted and battened floors.

UNIPERT PIPE

UNI-PERT PIPE – Our multi- layer underfloor heating pipe comes with a 50 year warranty and conforms to ISO 9001 & DIN 4726. Both our 16mm & 12mm are available in various coil lengths. We would recommend the user of a De-Coiler when using the larger coils.

UNI-MIXLV

UNI-MIXLV – The UNI-MIXVLV is a manually adjusted thermostatic regulating mixing valve kit for connection to UNI-MAN21-XX manifold. With an operating range of 20-65°C the UNI-MIXVLV matches the operating range of floor heating systems in accordance with BS1264-4 (2009) for initial warm up temperatures and a locking pin for maximum blend temperature. Comprising of a thermostatic head and remote sensor probe, remote sensor housing with temperature gauge and in-built non-return valve, mixing valve body with a facility to adjust the valve Kv rating for larger systems and a manifold circulating pump.

UNI-MAN21

UNI-MAN21 – Consisting of: 
• 1” return manifold in stainless steel AISI 304L with shut-off valves preset for electrothermal actuators mounted on metal brackets 
• 1” flow manifold in stainless steel AISI 304L with flow meters mounted on metal brackets
• 2 drain cocks mounted on manifold bars
• 2 air vent valves mounted on manifold bars.

ItemPortsSize
Width
A (mm)
Height
(mm)
Flow/Return
manifold spacing
(mm)
Pressure
UNI-MAN-0221" x ¾"193333.262006bar/87psi
UNI-MAN-0331" x ¾"243333.262006bar/87psi
UNI-MAN-0441" x ¾"293333.262006bar/87psi
UNI-MAN-0551" x ¾"343333.262006bar/87psi
UNI-MAN-0661" x ¾"393333.262006bar/87psi
UNI-MAN-0771" x ¾"443333.262006bar/87psi
UNI-MAN-0881" x ¾"493333.262006bar/87psi
UNI-MAN-0991" x ¾"543333.262006bar/87psi
UNI-MAN-10101" x ¾"593333.262006bar/87psi
UNI-MAN-11111" x ¾"643333.262006bar/87psi
UNI-MAN-12121" x ¾"693333.262006bar/87psi

Floor Coverings

Please see detailed below, details on typical floor coverings when used in conjunction with a Unitherm underfloor heating system:

Carpet – The combined tog value of the carpet and underlay should NOT exceed 2.5 tog, but its preferential for the combined tog value to be below 2.

Solid Wood – Solid hardwood should be kiln dried with a minimum moisture content of between 6% - 9%. The hardwood should also be stored in a dry place, acclimatised prior to laying and a floor sensor fitted to avoid overheating.

Laminate – A more stable floor covering than solid wood and its more hard wearing. Laminate can be easily installed on underfloor heating as a floating floor or with an adhesive, but check with the supplier for installation instructions. The floor temperature should not exceed 27°C, so a floor sensor should be fitted to avoid overheating.

Vinyl – Whilst vinyl works well with underfloor heating, it should be noted that the floor temperature should not exceed 26°C and therefore a floor sensor should be fitted. Also, vinyl should be acclimatised prior to installation by unwrapping and it being loose laid in the room that the vinyl is to be fitted for at least 24 hours prior to fixing.

Tiles – A very common floor covering with underfloor heating since tiles conduct heat well which means that the underfloor heating system will operate more efficiently and heat the room quicker. A decoupling membrane is recommended as this will isolate any movement and therefore protect the tiles from cracking.