Underfloor Heating
Systems
Installation & Operating Instructions
A choice of three underfl oor heating systems are available
in the range, each offering a variety of kit sizes, designed
for varying room and fl oor installations, enabling underfl oor
heating to be laid simply and effi ciently.
www.thermolay.co.uk
Underfloor Heating Systems
1. Introduction
Thermolay is an underfloor electric heating system which is installed immediately under the finished
surface of tiles or stone slabs. It renders the floor surface warm to the touch and supplements other
heating in the same room.
Thermolay Comes In Three Forms:
Cable Gives the best flexibility of layout and W/m2 (heating power per unit area), but requires additional work
when laying. Three kit sizes cover areas from 1.2m
Mat Requires less work when laying than cable, but gives a fixed W/m
2
1.0m
to 5.0m2. Comes with self adhesive tape runs pre-attached for initially fixing mat to floor.
Flexi-Fast Mat This can be stretched lengthwise by 50% giving 133 to 200 W/m
with the same flexibility of layout as the Mat. Six kit sizes cover areas from 1.6m
At heat value of 200W/m2 (Flexi-Fast unstretched) can be useful in getting the best level of underfloor heating in a conservatory but
it is not possible to rely on underfloor heating alone to heat a conservatory because of the large area of glazing, particularly the roof.
In other rooms (if the building meets the latest Building regulations) it is possible to heat the room with underfloor heating alone
if 200W/m2 (Flexi-Fast unstretched) is used.
It is important that the correct size of mat/cable is used since the heating cable must not be cut. You will need to plan the layout carefully
(see section 4) prior to purchase and get the right size mat/cable for the installation. It is possible to use more than one mat/cable for an
installation by parallel connection but no cable in the system is allowed to cross over or under any other.
2
to 6.4m2.
2
of 160. Six kit sizes cover sizes from
2
. It requires the least work when laying
2
to 15.0m2.
2. What You Will Need
a. Electric Cable/Mat (one or more as required):
Cable Kits – 100 to 200 W/m
Part No Length Coverage W Ω
UFHC24 24m 1.2 to 2.4m
UFHC32 32m 1.6 to 3.2m
UFHC64 64m 3.2 to 6.4m
Supplied with a reel of securing tape.
Mat Kits (Width 0.5m) – 160W/m
Part No Length Coverage W Ω
UFHM2 2m 1.0m
UFHM3 3m 1.5m
UFHM4 4m 2.0m
UFHM6 6m 3.0m
UFHM8 8m 4.0m
UFHM10 10m 5.0m
Securing tape built into webbing.
Flexi-Fast Mat Kits (Width 0.4m) – 133 to 200W/m
(Mat Width 0.4m, length can be stretched to 150% of figures
quoted) – 133 to 200W/m
Part No Length Coverage W Ω
FFM25 2.5m 1.0 to 1.5m
FFM40 4.0m 1.6 to 2.0m
FFM60 6.0m 2.5 to 3.7m
FFM100 10.0m 4.0 to 5.0m
FFM150 15.0m 6.0 to 9.0m
FFM250 25.0m 10.0 to 15.0m
Supplied with fixing pegs.
2
b. Controller
Installations without temperature control could give a floor
temperature of around 55°C which is not dangerously hot but is
wasteful of energy.
There are three controllers (temperature probe included) in the
Thermolay range, which, as well as regulating floor temperature by
means of an inclusive remote temperature probe, two of three will
define the time periods when the system is active. These are:-
2
2
240W 220 Ω
2
320W 165 Ω
2
640W 83 Ω
2
2
160W 330 Ω
2
240W 220 Ω
2
320W 165 Ω
2
480W 110 Ω
2
640W 83 Ω
2
, 800W 66 Ω
2
2
200W 264 Ω
2
320W 165 Ω
2
480W 110 Ω
2
800W 66 Ω
2
1200W 44 Ω
2
2000W 26 Ω
TPT1 Electronic ON/OFF Thermostat
An electronic thermostat with ON/OFF control
and a 10º to 30ºC temperature range.
TPT44 24 Hour Digital Clock Thermostat
Programmable thermostat with a 24 hour clock
face which controls both underfloor and room
TPT1
temperature.
TPT88 24 Hour/7 Day Multi-Programmable
Thermostat
Stylish 7 day programmable thermostat with
large display screen.
RAMSES 714 A Electronic Thermostat
An electronic thermostat with ON/OFF control
TPT44
and a 10º to 30ºC probe temperature range.
All controllers come complete with a 4 metre
flying lead temperature probe.
c. RCD Protection
This is essential to give the highest level of
electrical safety protection. The 10 year
guarantee cover of mats and cables as
components is not effective unless the
installation is protected by an RCD.
This could be covering the total house supply but
a better solution would be to use the RCD10WPV
or the TPF10WL from the Thermolay range.
d. Screed
This is used to cover cable or mat and provide a
bedding to locate and restrain tiles/stone slabs.
The required screed is self levelling or latex and
it is possible to use standard flooring grade tile
adhesive. A different grade is usually
recommended for wood and concrete/screed
floors respectively. Suitable products are
manufactured by Ardex, Bal, Evostick and F.W.
Ball amongst others. Please consult your local tile stockist or DIY
store, who would also be able to recommend a suitable flexible
additive which is essential to be mixed with the adhesive and a
suitable primer for the floor surface.
TPT88
RAMSES 714 A
RCD10WPV
e. Duct Tape
For the Mat and Flexi-Fast Mat systems you will need a reel of duct
tape (e.g. Duck) to fix the cold cable and probe with flying lead.
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