Dry or Fluid Inertia Radiator: We Help You Choose

Updated on 8 May 2023

After hours of testing and analysis, here are our tips for choosing the product that best suits your needs.


The dry inertia radiator, ideal for living rooms

Radiateur à inertie sèche

  • Good resistance to time
  • Little temperature variation
  • Good heat release over time
  • Usually fixed solution
  • More expensive to buy
  • Slower temperature rise

The heating core of a dry inertia radiator is made of refractory material: this can be metal (cast iron or aluminium) but it is preferable to choose stone (ceramic brick, marble, granite or volcanic stone), as it accumulates heat even better.

This type of material has a very low-temperature variation. Therefore, it takes a little longer to heat up, but it also gives off heat for a long time.

These heaters have the advantage of durability but are generally more expensive to buy and weigh more. This is the type of device that is usually left in a room, without trying to move it.


The fluid inertia radiator, interesting as a back-up solution

Radiateur à inertie fluide

  • Faster heating
  • Easier to move
  • Cheaper
  • Less sustainable
  • Less heat storage capacity
  • Consumes a little more electricity
  • May make some noises

Fluid inertia radiators use a heat transfer fluid (glycol water or vegetable or mineral oil) in which a resistor is placed. The resistor then heats up as the fluid rotates in a closed circuit. It is a heating method similar to that of a central heating system but without the complexity of connections.

This type of radiator heats up more quickly. This makes it interesting for rooms that are not heated all day, such as bathrooms (provided the radiator is protected from moisture) or bedrooms. It is also generally easier to move because it has wheels and a handle.

However, although it is cheaper to buy, it is less durable in the long term as it can leak.


In conclusion

Inertial heaters, whether dry or fluid, have the advantage of storing heat and releasing it when the unit is switched off. Both are therefore preferable to other electrical heating systems. However, they differ in the nature of their heating core.

More durable but also heavier, dry inertia radiators are more suited to main living areas. In a large room, it is preferable to install two radiators at medium power rather than one at maximum power. Fluid inertia radiators are less expensive and ideal for heating bedrooms or bathrooms quickly.



Translated by Ramsés El Hajje

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