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ProRad radiators come in three designs: Type 11 (K1), Type 21 (P), and Type 22 (K2). Type 11 radiators have a slim, single panel design, perfect for small spaces. They are made from a single convector, featuring a set of fins and an open back positioned against the wall, making them ideal for tight areas due to their slighter footprint. Larger units like Type 21 and Type 22 feature two panels and fins, providing higher heat outputs (BTU) but with a larger size. ProRad's compact yet efficient design ensures optimal heating solutions for spaces of all sizes.. Prorad Single Convector Radiator Type 11 K1 (700mm High) - 700mm x 500mm Steel 411705