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Heat Mat Mirror Demisters

Mirror demister pads for steam-free bathroom mirrors.

Mirror Demisters

A simple to install solution to ensure mirrors remain permanently steam-free.

  • Automatically ensures mirrors are clear of steam and can be used at all times
  • Makes life easier 
  • Uses up to 50% less power consumption than the leading alternative
  • Regularly used in hotels, new build and refurbishment projects
  • Ideal for bathrooms, ensuites, wet rooms and leisure facilities
  • 9 different standard sizes and 18 larger options to ensure a perfect fit
  • 9 low voltage SELV options available, supplied with transformers
  • Bespoke sizes and Voltages are available on request
  • No thermostat required in standard installations
  • Mains Voltage operation, removes the need for transformers
  • Independently BEAB approved and made in the UK

The demister must not be run continuously, it should either be on a timer or wired up through the lighting circuit so it only heats when the bathroom is in use. A 50cm by 50cm unit uses only 50 Watts of power per hour.

Mirror demisters in various sizes

Selecting the correct sized heater

Normally the Mirror Demister closest in size, but smaller than the mirror in question should be selected. The area covered will remain condensation free plus an additional margin around the edge of the mirror heater.

Combining multiple units

Multiple units can be combined to ensure complete coverage for the mirror in question. When units are combined there must be a 10mm gap between each heater, and they should be wired in parallel.


Although a Mirror Demister is usually installed covering the majority of the mirror, there is no requirement for this to be the case and some people prefer the look of a smaller panel in the centre of the mirror to be clear, surrounded by an area of condensation. To obtain this effect, select a mirror heater significantly smaller than your mirror.

Simple installation

Mirror Demisters have a self-adhesive backing enabling it to be easily attached to the reverse of a mirror. The mirror can then be affixed to the wall and the mirror heater can be covered with mirror adhesive, which must be solvent free. If being used with a safety-backed mirror the backing should be earthed, as should all metal parts surrounding the mirror.

Suitable for nearly all mirrors

Glass is a good conductor of heat and Mirror Heat is suitable for all recognised thicknesses of mirror. The thicker the mirror, the longer it will take for the heat to permeate. Care should be taken with mirrors which have cut outs as the mirror will be weakened in that area. The possibility of weakness will be reduced if the corners of any cut-outs have radii.

Hotel projects

Mirror Demisters are particularly suitable for use in hotel projects where it can be wired in through either the bathroom lighting system or the key-card operated circuit. Mirror Demisters are specified as standard in most new hotel complexes or refurbishments.

Bespoke mirror heaters

Bespoke units can be manufactured to order as required. Alternative requirements for panel sizes, lengths of coldtail or Voltages can be easily accommodated.

Approved and guaranteed

Heat Mat's Mirror Demister systems are BEAB approved, manufactured in the UK in a BEAB approved factory and supplied with a 10 Year Warranty.


Self-adhesive backing secures the mirror heater in place. For larger mirrors 150W/m mats and loose 3mm cable can be used for demisting if they are encased in a tile adhesive and used with a thermostat.

Technical Data

  • Heating Element: Carbon with copper connections
  • Supply Voltage: 240V
  • Power Output: 200W/m2
  • Alternative voltages: 12V & 24V units are available
  • Housing: IP44
  • Insulation: Double insulated
  • Dimensions: Varies between products
  • Coldtail lead: 1m 0.75mm2 double insulated cable


Mirror demisters can be wired through the lighting circuit, or to a separate switch if preferred. The circuit must be protected by a 5 Amp fuse or circuit breaker, and the wiring circuit must contain an all pole disconnection. Mirror heaters are not suitable for use with power supplies controlled via a dimmer switch.


Heat Mat Mirror demisters are BEAB Approved and supplied with a 10 year warranty. We supply a range of standard sizes or can specify a bespoke solution depending on your requirements.  

Product codes and sizes for standard 230V units 

Product Code SizeWattage  demistaTM Code
MRH-274-0150 274 x 150mm 7W 7005
MRH-274-0265 274 x 265mm 15W 7010
MRH-274-0584 250 x 550mm 25W 7020
MRH-300-0800 300 x 800mm 48W 7033
MRH-400-0450 400 x 450mm 36W 7025
MRH-524-0520 524 x 520mm 50W 7030
MRH-524-0785 524 x 785mm 80W 7035
MRH-524-1040 524 x 1040mm 100W 7040
MRH-524-1505 524 x 1505mm 150W 7050

Product codes and sizes for larger 230V units

Product Code SizeWattage  demistaTM Code
MRH-700-0780 700 x 780mm 104W 7070/800
MRH-700-0908 700 x 908mm 121W 7070/900
MRH-700-1036 700 x 1036mm 138W 7070/1000
MRH-700-1100 700 x 1100mm 147W 7070/1100
MRH-700-1228 700 x 1228mm 164W 7070/1200
MRH-700-1292 700 x 1292mm 173W 7070/1300
MRH-700-1420 700 x 1400mm 190W 7070/1400
MRH-700-1484 700 x 1500mm 199W 7070/1500
MRH-700-1612 700 x 1600mm 216W 7070/1600
MRH-700-1676 700 x 1676mm 225W 7070/1700
MRH-700-1804 700 x 1804mm 242W 7070/1800
MRH-700-1932 700 x 1932mm 260W 7070/1900
MRH-700-1996 700 x 1996mm 268W 7070/2000
MRH-700-2124 700 x 2124mm 286W 7070/2100
MRH-700-2252 700 x 2252mm 294W 7070/2200
MRH-700-2316 700 x 2316mm 312W 7070/2300
MRH-700-2380 700 x 2380mm 329W 7070/2400
MRH-700-2508 700 x 2508mm 337W 7070/2500

Product codes and sizes for SELV 12V units

Product Code SizeWattage  demistaTM Code
M12-274-0150 280 x 150mm 6W 7505
M12-274-0265 280 x 275mm 15W 7510
M12-274-0574 275 x 580mm 25W 7520
M12-300-0800 305 x 805mm 48W 7533
M12-400-0450 427 x 467mm 36W 7525
M12-524-0520 530 x 525mm 50W 7530
M12-524-0810 524 x 810mm 80W 7535
M12-524-1040 524 x 1040mm  100W 7540
M12-524-1550 524 x 1560mm 150W 7550

12V SELV Mirror Demister Transformers

Product Code  Output (W) Description
TRA-IRN-HIDE 5-40W 12V SELV Mirror Heater Transformer 5-40W
TRA-MEG-TRON 35-75W 12V SELV Mirror Heater Transformer 35-75W
TRA-BMB-LBEE 35-105W 12V SELV Mirror Heater Transformer 35-105W
TRA-STA-SCRM 50-150W 12V SELV Mirror Heater Transformer 50-150W

Bespoke sizes are also available, please contact us.

  • Simple to install
  • Ensures mirrors remain condensation free
  • Ideal for hotel projects
  • Low power consumption
  • Various Voltages and sizes available
  • Mix and match to ensure the perfect fit
  • Bespoke sizes can be manufactured
  • Low Voltage models and transformers are available
  • Resistant to moisture, vibration and ageing
  • Supplied with a 10 Year Warranty