Posted on 11 April 2022
The dry inertia radiator, ideal for living rooms
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 radiators have the advantage of durability, but they 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
Fluid inertia radiators work with a heat transfer liquid (glycol water, or vegetable or mineral oil), in which a resistor is placed. The resistor then heats up, while the liquid rotates in a closed circuit. It is a heating method similar to that of a central heating system, but without the difficulty of connections.
With this type of radiator, heating is faster. This makes it interesting for rooms that are not heated all day, such as bathrooms (provided the radiator is protected against humidity) 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 also less resistant in the long term since fluid leaks can occur.
Inertia radiators, whether dry or fluid, have the advantage that they store heat and continue to release it even after the device is switched off. They are therefore both preferable to other electric 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.