Some Advice Before Choosing your Temperature Transmitter

According to decrees across Europe, underfloor heating is the leading solution for energy consumption and CO2 emissions. It has a large CAGR (Compound Annual Growth Rate) predicted to increase by 7.5% per year up to 20281.

When deciding which heating system is suitable for you, it’s important to consider heat transmission and creation. How does the heat spread in the room? Which system uses a high or low temperature? Discover the main advantages and uses below to find the ideal heating solution for you.

Two Types of Heat Transmission: Convection or Radiation?

Type of heat transmissionConvectionRadiation
Main support useplancher chauffantplancher chauffant
  • radiator heats the air and the air heats the room

  • the heat is distributed by convection
  • warm air circulates around the room
  • heat emitter directly heats all the surfaces

  • heat is spread by radiation
  • radiation makes direct contact with walls and ceiling
Speed of heating✚✚✚✚✚✚✚
Efficient thanks to a very large heating surface
Thermal comfort
Easy and practical control of each individual room as the ceiling heats first, then shoulder height, and then feet
Homogeneous heat with underfloor heating; the interior temperature is lowered by 2° for the same level of warmth (set to 19 instead of 21°)2
Air comfort
The air throughout the room is dry
Convection operation displaces dust, and the wall on which it is mounted may even turn black: not recommended for people with allergies
There is no air movement, and thus no dust displacement, so it is a healthier choice
Comfort for feet
Floor is the last surface to be heated, it stays colder than air
No cold tiles: the floor is at optimal temperature for tenants’ feet
Depends on model
Invisible, hidden heating which saves 7% of interior space3
Simplicity of use and installation✚✚✚✚
Doesn’t require any major work and is easily adjustable

Requires some pre-work, but installation can be more efficient onsite

Low or High Temperature Emitter?

An emitter is the component of a heating system that transmits heat to a space that needs to be heated. Examples include radiators, convector fan coils, and underfloor heating. So which type of emitter is the best?

Type of emitterHigh temperatureLow temperature
OperationWater temperature is around 70°C (previously around 80°C)Water circulates at 45°
Energy consumption✚✚✚✚
Less water heating results in energy savings. Consumption is up to 30% lower
Environmental durability✚✚✚
Compatibility with heat sources
Only compatible with high temperature boilers
Compatible with all energy sources, including solar, low temperature boilers, or heat pumps
Compatibility with heat systemsHigh temperature radiatorsUnderfloor heating and low temperature radiators
Usability for renovation✚✚✚✚

Ideal for renovation as only the boiler needs to be changed and piping/plumbing can be kept


  • Adaptable but less straightforward
  • Should be installed in well-insulated rooms
  • Low thickness
  • No need for a dry screed system
Reversibility for cooling✚✚✚
Possible, but only with underfloor systems

CoExpert advice

With a high temperature system, installing thermostatic heads on radiators or thermostats ensures better control of room temperature and energy consumption.

Choose low temperature systems with a connected thermostat, you will be able to monitor and adjust your energy consumption more precisely and remotely.

Both high and low temperature systems and emitters have pros and cons. Knowing the advantages of both systems ensures you are making an informed and efficient choice. To optimize the efficiency of both systems, factor in connectivity when making a choice.

1 Source: Underfloor Heating Market Report, March 2022 / 2 Source: Certitherm / 3 Source: Chochebat – French syndicate for building owners /

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