73.5 m MAGNUM® Underfloor Heating Cable (1250 W)

See parts included Technical specification

The MAGNUM Electric Heating Cable 73.5 m has been specially designed for installing in cement floors. The spacing between the cables determines the capacity per m2. This gives you the freedom to apply more capacity (faster reaction time, higher temperatures) or indeed lower capacity (constant or low temperatures) when installing. Installation is very simple because the cable can be shaped. It can be secured to the MAGNUM Isorol using aluminium tape and with dove-tail platesor tie-wraps onto the concrete net. Moreover, handy spacer strips are available for fitting directly onto the floor. The advanced thermostat takes account of the required warming up period, so that your floor is always at the right temperature whenyou want it. The lack of radiators on the walls provides optimal freedom for interior decoration and placing furniture.

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Based on current settings, if you Add to cart current set and then order, you will receive the following items:

At least one Thermostat should be added to every cable order, however if you want to order multiple cables to achieve length which is not listed on our website (example 80 m = 40m + 40 m) only one cable should be added with included thermostate, the other one should not include it. One thermostat can handle up to 23 m² / 16 amps.

Other available cable lengths are available below:

Product Length Coverage Spacing Spacers required Price (tax included)
MAGNUM Cable 300 Watt 17.60 m 1.80 m² 100 mm 10 m £ 103.20
MAGNUM Cable 500 Watt 29.40 m 3 m² 100 mm 10 m £ 126.00
MAGNUM Cable 700 Watt 41.20 m 4 m² 100 mm 10 m £ 158.40
MAGNUM Cable 1000 Watt 58.80 m 6 m² 100 mm 15 m £ 198.00
MAGNUM Cable 1250 Watt 73.50 m 7 m² 100 mm 25 m £ 225.00
MAGNUM Cable 1700 Watt 100 m 10 m² 100 mm 25 m £ 277.20
MAGNUM Cable 2100 Watt 123.50 m 12 m² 100 mm 25 m £ 336.60
MAGNUM Cable 2600 Watt 152.90 m 14 m² 100 mm 35 m £ 389.40
MAGNUM Cable 2900 Watt 170.60 m 16 m² 100 mm 40 m £ 448.80
MAGNUM Cable 3300 Watt 194.10 m 18 m² 100 mm 45 m £ 478.80

MAGNUM Cable is supplied as a complete set and contains

  • Heating cable
  • Floor sensor
  • Flexible tube for floor sensor
  • Securing tape
  • Installation instructions
7 m²
73.5 m
Heating Power
1250 Watt
Cable diameter
7 mm
Chrome / Nickel resistance wire
Aluminium earthed sheath
100 mm
Spacers requried
10 mm
Digital Thermostat
This stylish, colourful and refined digital clock thermostat has been specially designed for electric heating systems. The MAGNUM X-treme Control is supplied with every MAGNUM floor heating set (Mat,Cable and Foil types), including external floor sensor, a built-in air sensor and three different frames that suit most brands of switching equipment. The MAGNUM X-treme Control is simple and intuitive to operate using touch sensitive buttons under the display. The new chameleon function is simple to adapt to the colour of your interior. The stylish screensaver shows the time, temperature and current mode without touching the thermostat. The MAGNUM X-treme Control has a new help function that appears after 10 seconds in the menu with a complete description of the setting in question. The MAGNUM X-treme Control also has a wooden floor function whereby the temperature is limited to 28°C. This makes the MAGNUM X-treme Control the idea and safe solution for every electric heating system.


  • Voltage: 230 Volt - 50/60 Hz
  • Maximum capacity: 16A - 3600 watt
  • Temperature range: +5 to +40°C
  • Frame: IP21
  • Color: Polar white (RAL 9010)
  • Testing: FI/CE

Technical details:

  • Control via touch sensitive keys
  • Chameleon function (8 colour themes)
  • Screensaver night clock
  • Automatic start-up menu
  • Slow start-up function
  • Wooden floor function (28 °C limit)
  • Built-in help function
  • Automatic summer and winter times
  • Multi-programme function (2 periods per day)
  • Programming multilingual
  • Including floor and air sensors
  • Multi-frame adapter system for: Gira, Jung, Elko, Merten, Busch Jager, etc.
Digital Thermostat
In some situations the digital regulation is not required and so the preference is for a simple on/off operation. Specifically industrial applications where the heating must remain on at all times. Therefore MAGNUM has designed the Standard Control: a simple on/off thermostat with temperature regulation that is clearly easy to operate.


  • Voltage: 230 Volt - 50/60 Hz
  • Maximum load: 16A / 230 V
  • Temperature range: +5 to +40°C
  • Housing: IP21
  • Color: Polar white (RAL 9010)
  • Testing: CE

Technical details:

  • On/off thermostat complete with temperature regulation
  • Including floor sensor
  • Integral room sensor and floor limit sensor
  • Multi frame adapter system for: Gira, Jung, Elko, Merten, Busch Jager, etc.
Cable fitting guide 1

This MAGNUM Heating product is manufactured from high quality, durable materials. To guarantee that your product functions optimally there are a few points of attention which are described in the Installation Instructions. We can only offer you the full guarantee if the system is correctly installed in accordance with these Installation Instructions. Carefully read the instructions prior to installation, do not forget the yellow centre page when doing so, and ensure that you have the correct tools and materials. The electrical installation must be carried out by a qualified electrician in accordance with IEE Regulations.Please visit www.magnumheating.com to find your local supplier if you have any questions, require more information or support.

1. Checklist

Check the contents of the box before starting. A complete set consists of:

  • A heating cable with connecting wire
  • A MAGNUM X-treme Control digital thermostat incl. floorsensor*
  • A flexible sensor tube
  • Roll of Alutape
  • Installation instructions

2. Measurements

Product Length Amp Ohm
MAGNUM Cable 300 Watt 17.60 m 1.3 177
MAGNUM Cable 500 Watt 29.40 m 2.1 109
MAGNUM Cable 700 Watt 41.20 m 3 76
MAGNUM Cable 1000 Watt 58.80 m 4.30 53
MAGNUM Cable 1250 Watt 73.50 m 5.40 42
MAGNUM Cable 1700 Watt 100 m 7.40 31
MAGNUM Cable 2100 Watt 123.50 m 9.10 25
MAGNUM Cable 2600 Watt 152.90 m 11.30 20
MAGNUM Cable 2900 Watt 180.60 m 12.80 18
MAGNUM Cable 3300 Watt 194.10 m 14.30 16

3. Points of attention

The MAGNUM Cable is insulated and watertight and can be installed on Foil finished insulation (Kingspan or Celotex) or existing concrete bases. The construction of the cable also allows installation in wet spaces. The heating cable may never be installed under fixed objects like wall units, kitchen units, baths, or showers and must be able to give off its warmth unimpeded. The power supply must be disconnected during installation. All installations must be wired through a suitably rated MCB or RCCD when applicable. All installations in wet areas must be wired through a dedicated RCCD in line with the thermostat. All connections must be made by an approved Electrician in accordance with current IEE regulations. The electrical heating cable is patented worldwide and fully conforms to the European IEC 800 standards. The connector cable can be extended or shortened, there must always be at least 0.5 meter of connecting wire left. The heating cable cannot be shortened! The end seal cannot be broken. If multiple cables are installed in a space, they must be wired in parallel and a suitably rated junction box may be incorporated so that only one power cable runs to the thermostat. Maximum capacity of the thermostat is 16 Amperes. If fitting more than one cable set and the combined area length exceeds194 meters (3400 watts), a suitably rated Contactor will have to be fitted. The thermostat may only be installed by a qualified electrician. Before installing the MAGNUM Cable, the resistance reading should be taken and noted down on the inspection card in the center of this manual. Keep this inspection card in the meter cupboard in a visible place this is part of your guarantee! (see point 8) The sensor must always remain IN the sensor conduit. Fit cap to end of the sensor conduit. If the sensor ever needs to be replaced it can then easily be removed. The MAGNUM Cable can be used under various floor finishes - Tile, Marble, Slate, Wood, Laminate, Vinyl and Carpet. (Tog rate of carpet and underlay should not exceed 2.5). If using underneath a wooden floor or carpet please contact your flooring supplier.

4. Required for installation:

  • Standard junction box (min 35mm deep, preferably 50mm) for the thermostat.
  • Mounting material: Tie wraps, alu-tape, MAGNUM Spacerstrips or smooth Weld Mesh.
  • Electrical conduit for the connecting cable for the thermostat.
  • Flexible mortar or sand/cement screed (dependent on the mounting height).

5. Preparation

  • Check that the cable length/wattage is correct for the area of free floor surface that must be heated.
  • Check the available electrical connection and mains voltage in the space for installation.
  • Test the cable with a multimeter and check with the test data in Section 2.
  • 1 or 2 grooves must be cut/ground in the wall for electrical conduits, 1 for the power cable and 1 for the floor sensor. Do NOT run the power cable and sensor cable through the same pipe.
  • Ensure that the base floor is clean and level.
  • Always apply insulation to the base floor if possible. Uninsulated floors will have downward heatloss.
  • Place expansion strips around the perimeter of the area (for coping with the contraction and expansion of the floor).

6. Sensor

Ensure that the sensor is installed well clear (min. 50 cm) of central heating pipes, water pipes, drains and electrical wiring. The sensor must be installed in the middle of a cable loop for optimal temperature registration. Ensure that the heating cables do not make direct contact with the conduit in which the floor sensor is mounted.

Cable fitting guide 3 Cable fitting guide 4 Cable fitting guide 5 Cable fitting guide 6

7. Resistance readings

Before installing the Comfort Cable, the resistance reading should be taken and noted down on the inspection card in the center of this manual. The reading should be taken during the installation and on final completion. These readings should be as per the technical information (Point 2). Take measurements both between the resistance wires and between the resistance wire and the earth cladding. Keep this inspection card in the meter cupboard in a visible place! This forms part of your guarantee.

8. Calculations for Heat Requirement

150+ Watts/m² for prime heating of normal rooms cable spacing 100 mm 100/125 Watt sq. m for comfort heating of normal rooms cable spacing 125/150 mm Example: for a conservatory of 20 sq. m floor surface multiply the total floor surface with the above mentioned capacities (20 x 150 Watt = 3000 Watt) Choose set 3300 - 3300 watt. Cable can be sized (or checked) by measuring the linear length i.e. Heat required 150 watts/m². Room size 4mx3m =12m² Cable spacing = 100mm Therefore 4mx30 = 120 linear mts. Use 2100 Watt set (124 linear mts). If there is any excess cable left after installation, you can space a few runs at 50mm at the window & door areas of the room to lose it in the floor. NEVER SHORTERN THE CABLE

10. Fitting the cable to the floor

Fit the cable end (marked with *******) through the electrical pipe to the back box for the thermostat. The word "splice" must stay visible. Splice must be covered by screed. Fix the spacer strips at 500 - 600 mm centres with masonary or Hilti nails. Attach the cable in a zigzag fashion with a distance between the cable as required. If reinforcing is used (Smooth Weld mesh at 100mm square) plastic tie wraps can be used for attaching the cable directly to the reinforcing. Extend the 2nd electrical pipe to about 50 cm from the wall and have it end in the middle of a cable loop. Pull the sensor cable to the back box and ensure that the sensor is in the conduit. Ensure the cap is placed on the end of the conduit so that replacing the sensor is always possible. Please contact your local Technical Department www.magnumheating.com if you require assistance on the spacing of the cable.

Cable fitting guide 7Cable fitting guide 8 Cable fitting guide 9 Cable fitting guide 10

Documents available below are available to everybody for free to download. They can be open in high quality on your computer and be printed for further use.

Magnum Heating Cable Manual Magnum Heating Cable Fitting instructions Magnum Heating Cable Datasheet Magnum Heating Cable Technical specification VDE Approval

No reviews
Are your underfloor heating mats secondary or primary output?

The issue is not the underfloor heating, and more the insulation in the property. The mats are 150w/m2 (required for VDE approval) and is reliant on suitable insulation within the property. Insulation beneath the ufh, to ensure maximum heat goes into the room, and then insulation within the room, to ensure the heat remains in the room. In new properties, there is no issue, due to insulation standards being extremely high. In older properties, where insulation is lacking, is where we forsee an issue. If insulation is up to scratch, there should not be a problem. If the customer is concerned, or want to ensure a suitable output, a heat loss calculation must be carried out.

If you have any other questions I will forward them to the manufacturer and then reply to you.

David 020 7193 0953

Hi, can you please tell me if I order today when can it be delivered to Kent Paul

Dear Paul,

This product is available off-the-shelf, so if you order it before 3 o'clock it will be shipped same day with next day delivery.

I am happy to help if you have any other questions.

Kind regards


020 7193 0953

Can electric underfloor heating be used on this product?

Dear Customer,

I confirm that our shower trays are suitable with underfloor heating if it's fitted on top of them.

They are based on XPS foam which is great insulator, therefore if UFH was installed under them, it would provide only limited warmth. Floor on top of the tray would not be as warm as on the rest of the room.

Please notice that the tray has 15 mm lip and that's the space you have to accomodate your tiles, UFH and tile adhesive. You should check how thick are your tiles and UFH if together are less than 15 mm it should be fine to be used on our tray.

Kind regards

David 020 7193 0953

Are you able to ship to Australia? What would the cost be? Thanks


How many of them would you like to buy? Would this ba an order for a single product or do you want to order more of them, a pallet for example?

I think shipping is possible, what's the price and time acceptable for you that's the question.

Kind regards

David 020 7193 0953

hi do you do delivery to Perth Western Australia 6110 and if so how much. Thanks


How many of them would you like to buy? When do you need this shower tray? This is a new product in our store and we do not have it in stock yet, so the delivery of this product takes longer because it is produced only after placing the order. Production and delivery can take up to 25 days.

Please, let us know how many of them you require and we will prepare a delivery quote.

Kind regards

Agnes D.
Customer service

What are your office opening hours ?Are you open on an Saturday please ?


We are not working during weekends, sometimes we do reply to emails and phone calls.

You can visit our Rotherham warehouse from Monday to Friday, 9am - 6 pm.

Let me know if you have any questions about our products or service.

Kind regards

Adam 017 0927 3601

Do you sell the tanking liquid separately?


Yes, tanking liquid is available separately, however it's less cost efficient. Waterproofing kit is available at comparable price and contains materials that you will probably need to use anyway.

There's special category in our store: Tanking liquid.

I am happy to assist if you have any further questions.

Kin regards

David 020 7193 0953

Are these suitable for underfloor heating?


Yes, I can confirm that these trays are suitable with Underfloor heating.

They are based on good insulator - XPS - therefore your UFH should be installed on top of the tray, under the tiles. If it was installed under the tray, it would only have a very limited effect.

Please notice that there is a limited space from the shower tray surface to the upper grate edge. In case of this tray it is 20 mm you have to accomodate your underfloor heating, tile adhesive and tiles.

I am happy to assist if you have any questions.

Kind regards

David 020 7193 0953

If I order the item now. When will it come?

Hi Andrea,

It's too late for us to ship it today, but if you ordered it now we would ship it tomorrow with next day delivery.

Orders placed before 3 o'clock are shipped same day. After 3 o'clock on the next business day.

Kind regards

David 020 7193 0953

I've just purchased a 3.5 m underfloor mat and found its too small, can I exchange for a 5 m mat and pay the extra

Dear Heather,

The best way to solve that would be to order a new UFH Mat here: MAGNUM® Underfloor Heating mat 5 m² 50 cm x 10 m, and send the mat that is too small to us:

Wetrooms Design Ltd
Unit 12C, Albion Drive, Thurnscoe
Rotherham, S63 0BA

we will refund its cost in full as soon as it's back with us.

Please notice that you can keep thermostat, but all the other parts need to be supplied back to us (we will supply them with a new mat as well).

Kind regards

David 020 7193 0953

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