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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-panel models, perfect for small spaces due to their compact footprint. They feature a single convector (row of fins) and open backs that face the wall, making them thinner and ideal for tight spaces. Larger units like Type 21 and Type 22 have two panels and fins, offering higher heat outputs (BTU) but increasing in size. ProRad radiators are designed for efficiency and practicality, providing excellent heat distribution while fitting various space requirements.. Prorad Single Convector Radiator Type 11 K1 (600mm High) - 600mm x 2000mm Steel 411620