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ProRad radiators come in various designs: Type 11 (K1), Type 21 (P), and Type 22 (K2). Type 11 radiators are slim, single-panel units ideal for tight spaces with smaller footprints. Larger units, like Type 22, have two panels and fins, offering higher heat outputs (BTU). Type 22 radiators include two convectors (rows of fins), which double the surface area and heat production. This also increases the radiator's projection. Both front and back panels help retain heat and improve distribution throughout the room.. Prorad Double Convector Radiator Type 22 K2 (300mm High) - 300mm x 2000mm Steel 422320