Made completely out of aluminium which is light and pliable material that allows fast and cheap manufacturing as well as easy transport and installation. Aluminium reacts quickly to temperature changes which means that it has very high thermal conductivity. Aluminium radiators are heated fast but they also cool down fast. The material allows them to be covered with a protective layer and powder coated in different colours (even though white is the most commonly used colour). This type of radiator has very high heating capacity even in small size. They are not recommended for large central heating systems due to the bad quality of the heat carrier (high acidity, rust and particles). This can lead to electrochemical corrosion.
- Injection molded aluminium radiators. They are made using molds and have wide fluid channels and thick walls. They are made of separate sections which can be removed or added. Each section is molded under pressure and the material is an aluminium alloy that also contains silicon to increase the strength and all welds are made in inert gas envorinment. Hermetically sealed connections, reliability but also higher price are the main characteristics of injection molded radiators.
- Extruded aluminium radiators. To make them extrusion technology is utilized – the central part is not molded but squeezed under pressure through an extruder and then pressed. With this technology there’s no casting, only pressing. This is a cheaper method of making aluminium radiators and they have lighter construction, easy installation, quick heating and they are more economical. They are usually made of recycled aluminium, they have thinner walls and cannot withstand high pressures which also leads to a lower price. The main disadvantage is that the number of sections is fixed and they cannot be dismantled.