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ProRad radiators come in three designs: Type 11 (K1), Type 21 (P), and Type 22 (K2). Type 11, the slimline single panel, has a smaller footprint, making it ideal for small spaces. It features a single convector (row of fins) and an open back that faces the wall, allowing it to fit better in tighter areas. Type 21 and Type 22 radiators have two panels and fins, delivering higher heat outputs (BTU) but are larger in size. These radiators cater to different space requirements and heat output needs.. Prorad Single Convector Radiator Type 11 K1 (300mm High) - 300mm x 2000mm Steel 411320