There are several aspects to consider and for every individual there will be a different preference. This could be which radiators are the cheapest to run, which radiator heats up the fastest, which one is the most energy efficient in saving fuel or which one will give out the most heat for its dimensions.
Size matters if you live in a small property. If you need small radiators to save space, then you may want to have a look at panel heaters. You can either go for the single panel which is very slim and will fit close to a wall.
Of course if you go for more panels which includes fins or a convector model the output will be greatly improved. As is always the case a radiator with a great surface area will give out more heat than a single panel one.
I think that most of us would like to buy radiators that will save them the most energy. Theoretically, the radiators that hold the least water should save us the most. The reason behind this is the fact that it will take less time to heat up the heater so it will require less fuel.
However, modern radiators for sale are all energy efficient and there is very little difference between all of them in efficiency. Today’s radiators all hold less water and if you should change all your heaters then you will save some money.
The metal modern radiators are made of doesn’t matter greatly either. All metals such as aluminium, steel and cast iron have different properties where heating is concerned. Aluminium and steel heat up fastest, but they lose heat quickest too.
Cast iron does take longer to heat up, but once at temperature, this metal holds heat for longer. Painted finishes give a greater heat output than bare metal varieties.