Panel radiators (also known as flat radiators) are compact heating units made of sheet steel with a flat design.
Type: A distinction is made between flat panel radiators (plan radiators) and compact radiators:
Model Code:
Both plan and compact radiators are available in single- or multi-panel designs. The model code indicates the number of panels placed one behind the other and whether convection fins are included:
Type 10:
Single-panel radiator without convection fins. These radiators have a shallow depth and are suitable for rooms where space is limited.Type 11:
Single-panel radiator with convection fins. The fins improve convection, increasing heat output. Type 11 radiators are suitable for rooms requiring more heating power.Type 20:
Double-panel radiator without convection fins. These radiators provide higher output than Type 10 and are suitable for medium-sized rooms.Type 21:
Double-panel radiator with one layer of convection fins. These radiators offer even greater heat output and are suited for larger rooms.Type 22:
Double-panel radiator with two layers of convection fins. These provide very high heat output and are ideal for large rooms or those with high heating demand.Type 30:
Triple-panel radiator without convection fins. Suitable for spaces with high heating needs and sufficient installation depth.Type 33:
Triple-panel radiator with three layers of convection fins. These offer the highest heat output and are ideal for very large spaces or those with exceptionally high heating demand.
Image credit: Buderus
Source: Recknagel (2020): Handbook for Heating and Air Conditioning Technology