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ProRad radiators are available in three designs: Type 11 (K1), Type 21 (P), and Type 22 (K2). Type 11 features a slimline, single-panel design, ideal for small spaces with its slight footprint. Type 21 radiators include a single convector (row of fins) and an additional panel to enclose the convector, making them thinner and perfect for tight spaces. Type 22 units are larger with two panels and fins, providing higher heat outputs (BTU) but increasing the size. Each type is thoughtfully designed to cater to various space requirements and heating needs. Choose ProRad for efficient and versatile heating solutions.. Prorad Double Panel Single Convector Radiator Type 21 (700mm High) - 700mm x 400mm Steel 421704