Double Panel, Single Convector with Side Panels & Top Grille
Panel Plus radiators are also known as K21, Type 21, Type 12, Panel Plus, PKP and P+. They come with two panels and one convector. The BTU output is approx 50% better than the single equivilant. They have a popular design as they are only slightly deeper than single radiators but have a much better output and are not as bulky as double radiators.
The above diagrams are example side and top profiles of Panel Plus radiators showing two panels and one convector.
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