What is the difference between a Type 11, Type 21 and Type 22 radiator?

When you’re buying a compact central heating radiator, there are three common ‘types’ – to heat your room correctly and efficiently, it’s important to understand the difference.  If you’re not a plumber or heating engineer, you’ve probably not heard of the different ‘types’ of convector you can buy, but if you’re replacing an existing radiator…

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