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ProRad radiators are available in three designs: Type 11 (K1), Type 21 (P), and Type 22 (K2). Type 11 radiators are slimline single panel units, perfect for small spaces due to their compact size. Type 21 radiators feature a single convector (row of fins) enclosed by a second panel, making them ideal for tight spaces while offering increased heat output. Type 22 radiators have two panels and fins, providing higher heat outputs (BTU) but also increasing their size. These options cater to various heating needs and spaces, ensuring efficiency and performance.. Prorad Double Panel Single Convector Radiator Type 21 (600mm High) - 600mm x 1100mm Steel 421611