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ProRad radiators are available in three distinct designs: Type 11 (K1), Type 21 (P), and Type 22 (K2), each offering tailored heating solutions. The Type 11 radiator is a slimline, single-panel model designed with a compact footprint, making it ideal for smaller spaces or rooms with limited wall space. Type 11 units feature a single row of convector fins with open backs that face the wall, which helps reduce the radiator's overall thickness while providing efficient heat output. For larger spaces, the Type 21 and Type 22 radiators are more suitable, as they incorporate two panels and convector fins, significantly increasing their BTU output for higher heat efficiency. While larger in size, these models deliver enhanced heat distribution, making them perfect for heating bigger rooms. Each design balances space-saving features with optimal heating performance.. Prorad Single Convector Radiator Type 11 K1 (600mm High) - 600mm x 1800mm Steel 411618