Comparison of electric heaters

The Pierre radiator: energy and thermal efficiency

The energy efficiency of the natural stone radiator

A unique manufacturing process allows us to obtain an optimized restitution of the radiation and to obtain an optimal energy efficiency. Our product is not just a design and natural object, it is above all a very energy efficient electric radiator.

The natural stone radiator is a type of heating adapted to modern needs: it combines energy sobriety and thermal comfort. It allows you to achieve thermal comfort very quickly while saving energy.

Electricians for more than 80 years under the company Sodielec Berger SARL, we have designed this stone radiator so that it is more efficient than all the others. categories of electric heaters present on the market.

The stone radiator gives off a real soft heat

Our Natural Stone radiators are not reconstituted and are cut directly from the very heart of the rock. We are the only ones to design and market this product in France. Our competitors may use the expression “stone inertia radiator” but they do not use the Stone in its natural state. Indeed, the material they use is only a reconstitution of the Stone (the Stone is pressed in molds with glue).

This difference is fundamental and allows our natural stone radiator to release a real soft and natural heat. This special heat allows you to achieve thermal comfort with a lower set temperature and generate substantial energy savings.

The inertia of Natural Stone: heat emitted without interruption

The inertia allows natural stone electric radiators to constantly release heat, even after the power supply has been cut off.

The natural stone radiator has excellent thermal inertia for two reasons:

    • The radiator is cut directly from a block of Marble, Granite or Travertine. The radiator is 100% Natural Stone and has a significant weight;
    • Natural Stone has excellent thermodynamic properties with, in particular, a very high mass heat capacity. In other words, the heat storage power is very high for Marble, Granite and Travertine.

These two elements explain why the natural stone radiator has better inertia than most electric radiators. But this inertia is not to the detriment of the responsiveness of the heating. Indeed, the non-dissociation of the body and the heating core allows a very rapid rise in temperature. Contrary to cast iron electric heater, the stone radiator quickly adapts to your heating needs.

Natural warmth thanks to the stone radiator

The stone radiator is a type of heating releasing almost all of its heat in the far infrared. Long infrared radiation (IRC) allows you to obtain a natural and extremely gentle heat. Like the rays of the sun, the thermal waves emitted by our heating penetrate our skin deeply and bring this pleasant feeling of soft heat. This natural heat allows you to instantly feel a warm sensation and encourages you not to over-consume. You save energy while reducing your energy bill.

Unlike conventional electric radiators, the Natural Stone radiator produces almost no convection movements. However, convection heating often produces a large amount of very irritating dust and dries the air.

The long infrared heat of the electric stone heater offers a real breath of fresh air to many asthmatics. Thanks to the limited air movements, the dust stays on the ground and the concentrations in the air are lower. The air is not dry, room humidity is respected and there is no longer any appearance of black marks on the walls. The atmosphere is not stuffy because of the heating. The stability of the humidity prevents irritation of the respiratory tract due to air that is too dry or too humid.

The natural stone electric radiator

Even temperature distribution

The Natural Stone radiator heats all the "solid bodies" and living beings in a room thanks to thermal radiation. The radiation is absorbed and stored by the "solid bodies" up to 85%. It is this phenomenon that allows you to feel the sensation of heat. The solid bodies will then accumulate heat and heat the air step by step.

Convection phenomena are almost non-existent. This heating process therefore does not generate air circulation and thus prevents the movement of particles and dust. There is real thermal homogeneity in the room with a temperature difference of around 1°C between the floor and the ceiling. So you no longer have cold feet and benefit from even and constant heat. Homogeneous heat distribution is one of the characteristics of the low consumption electric radiator.

Conversely, the strong temperature gradients in the ambient air are the result of heating by convection which tends to confine the layers of hot air near the ceiling and the layers of cold air near the floor. In order to keep the living area at a comfortable temperature, the air in the vicinity of the ceiling must be unnecessarily overheated. Not only does this create an unpleasant temperature difference, but it is also a major source of energy loss.

With radiant heat, the thermal sensation felt is 3°C higher than the actual temperature. In other words, you feel as good in a room with radiant heating with a temperature of 18°C ​​as in a room equipped with convectors where the ambient temperature is 21°C. With efficient electric heating, you can save several hundred euros every year.

The thermal comfort of your home thanks to the natural electric radiator in natural stone
The even temperature distribution of a natural stone electric heater

The natural stone radiator: a classic dry inertia radiator?

The Natural Stone radiator is a dry inertia radiator classic. Nevertheless, whether in terms of its design or its energy performance, it does not resemble the dry inertia radiators that are usually found on the market.

Classic dry inertia electric radiators are in most cases made up of two elements:

  • The heating core made up of refractory bricks, soapstone stones or heat transfer fluid.
  • The heating body usually consists of cast aluminum, metal or glass.

This design is absolutely not optimal because it transforms a large part of the absorbed energy into convective heat. Indeed, the heat must be transmitted from the heating core to the heating body. Since the thermal expansion of the two elements is not identical, it is necessary to have a space with the casing to avoid the destruction of the heating core. This space creates a circulation of convective hot air and the radiative efficiency is thus reduced. It suffices to be convinced of this to study these radiators which in most cases have a grille on the top allowing the hot air resulting from convection to be evacuated. Over the years, a black mark on the wall also materializes a deposit of dust due to the convective effect.

The convective energy of a cast aluminum radiator

On this classic dry inertia radiator in cast aluminium, the radiative efficiency is not optimal and the energy losses linked to the separation of the body and the heating core are very significant.

The unique design of the Natural Stone electric heater

On our Natural Stone radiator, the resistance is inserted in the very heart of the rock. The Stone restores to 95% radiant energy. As a result, the stone radiator has a freestanding.

Stone electric heaters

The Verde Guatemala | 500W – 30x100cm


All our radiators can be installed horizontally or vertically.

The Travertine | 750W – 60x60cm


All our radiators can be installed horizontally or vertically.

The White Gray | 1500W – 60x130cm


All our radiators can be installed horizontally or vertically.

The Black Galaxy | 1100W – 60x90cm


All our radiators can be installed horizontally or vertically.

Our articles on electric heaters
  • Comparison of electric heaters
  • The energy efficiency of the natural stone radiator
  • The different types of dry inertia radiator
  • Low consumption electric heaters
  • Stone inertia radiators
  • Dry or fluid inertia radiator: which to choose?
  • Cast iron electric heaters
  • What is the difference between a storage heater and an inertia heater?