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ProRad radiators come in three designs: Type 11 (K1), Type 21 (P), and Type 22 (K2). Type 11 radiators are slimline single panels, ideal for tight spaces with smaller footprints. Type 22 radiators, larger in size, have two panels and fins, providing higher heat outputs (BTU). These radiators feature two convectors (rows of fins), which double the surface area, producing more heat and increasing the radiator's projection. They use both front and back panels, effectively retaining heat and ensuring improved distribution throughout the room.. Prorad Double Convector Radiator Type 22 K2 (600mm High) - 600mm x 1400mm Steel 422614