Radiators are available in three main types, detailed as follows:
Type 11 Single panel, single convector. The first digit indicates 1 panel, second digit 1 convector [ridged metal fins on back of radiator]
Type 21 Double panel, single convector. The first digit indicates 2 panels, second digit 1 convector [ridged metal fins in middle of radiator, between panels]
Type 22 Double panel, double convector. The first digit indicates 2 panels, second digit 2 convectors [ridged metal fins in middle of radiator, between panels]
Always check the manufacturers heat output data for each radiator you want to install.
It is also important to compare different radiator styles for heat output. A heated towel rail, as shown below, may look quite big – but often not too good for heating a bathroom.
Sadly heated towel rails are not sufficient to heat a bathroom. It is always worth going for a larger size towel rail, if you intend it to also heat the bathroom. Manufacturers data will confirm the design heat output. Add 25% capacity required if you are hanging towels on it. As radiators can not warm towels and heat rooms very efficiently at the same time.
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I have put a post together giving details of how to choose the right size of radiator for heating a room. The link https://aimhome.wordpress.com/2012/12/30/central-heating-radiator-sizing/
will take you there.
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