What do radiator type numbers mean?
The first digit indicates the number of panels, and the second digit is the number of convectors which are the ridged metal fins in middle of radiator, between panels.
so type 21 has two panels with one convector between.
Double Panel+ Radiator 500x1000mm Type21 £43.99
Double Panel+ Radiator 600x800mm Type 21 £43.19
Double Panel+ Radiator 500x900mm Type 21 £39.19
Double Panel+ Radiator 500x1200mm Type21 £59.99
Double Panel+ Radiator 600x700mm Type 21 £35.99
Double Panel+ Radiator 500x800mm Type 21 £34.39
Double Panel+ Radiator 600x600mm Type 21 £32.79
Double Panel+ Radiator 500x1300mm Type21 £62.39
Double Panel+ Radiator 600x1200mm Type21 £62.39
Double Panel+ Radiator 500x700mm Type 21 £31.19
Double Panel+ Radiator 500x1400mm Type21 £64.79
Double Panel+ Radiator 600x500mm Type 21 £29.59
Double Panel+ Radiator 500x1600mm Type21 £67.99
Double Panel+ Radiator 500x600mm Type 21 £29.59
Double Panel+ Radiator 600x1300mm Type21 £70.39
Double Panel+ Radiator 500x1500mm Type21 £66.39
Double Panel+ Radiator 500x500mm Type 21 £27.99
Double Panel+ Radiator 600x400mm Type 21 £27.99
Double Panel+ Radiator 600x1400mm Type21 £72.79
Double Panel+ Radiator 600x1500mm Type21 £74.39
Double Panel+ Radiator 500x400mm Type 21 £26.39
Double Panel+ Radiator 600x300mm Type 21 £26.39
Double Panel+ Radiator 600x1600mm Type21 £75.99
Double Panel+ Radiator 500x300mm Type 21 £24.79
Double Panel+ Radiator 600x1100mm Type21 £58.39
Double Panel+ Radiator 600x900mm Type 21 £47.19