A well-chosen and well-maintained radiator makes the difference between a comfortable winter and a bill that spirals out of control for no reason. Before buying one or replacing the one you already have, it’s worth understanding what types exist, how they behave and what maintenance they need.
Types of radiator by how they work
Hot-water radiators remain the most common option in homes with a boiler. They work by water circulation and offer stable, silent heat. Electric ones, on the other hand, don’t depend on pipe installation: you plug them in and that’s it, ideal for specific rooms or flats without gas. Among electric models, oil-filled ones take longer to heat up but retain heat after being switched off, while ceramic or dry-element ones raise the temperature in seconds.
How to calculate the power you need
A useful rule of thumb: between 70 and 100 watts per square metre in rooms with average insulation. A 20 m² living room will need around 1,500 W; a small bathroom is covered with 500-700 W. If the home has old windows or cold walls, lean towards the high end. Oversizing the radiator isn’t serious, but it makes the purchase more expensive and can generate uncomfortable heat through short cycles.
Materials and efficiency
Aluminium heats up quickly and weighs little; cast iron takes longer but retains heat for hours. Steel ones are a reasonable balance between price and performance. If you’re looking for efficiency, look for models with programmable thermostatic valves: they let you adjust the temperature by time slots and reduce consumption without you noticing it in comfort.
Maintenance that extends the radiator’s life
Bleeding the air at the start of the season prevents noises and cold spots. Clean the fins with a damp cloth or the vacuum brush: accumulated dust reduces heat output. And don’t cover it with furniture or curtains, because you block convection and the unit works harder. On water models, check every few years that there are no leaks at the connections.
Home safety
Keep at least half a metre away from textiles and curtains. In homes with children or pets, opt for models with a cool-to-the-touch surface or install guards. Avoid drying clothes directly on top: besides the risk, it prevents the circulation of hot air.