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ProRad radiators come in three designs: Type 11 (K1), Type 21 (P), and Type 22 (K2). The slimline Type 11 single panel radiator is ideal for tight spaces with its smaller footprint. Larger units like Type 22 have two panels and fins, offering higher BTU outputs. Type 22 radiators feature two convectors that double the fins, increasing the surface area and heat production. They project more heat due to their design. The front and back panels of Type 22 help retain heat and improve distribution throughout the room.. Prorad Double Convector Radiator Type 22 K2 (400mm High) - 400mm x 1000mm Steel 422410