A "single type 11 radiator" refers to a specific design of panel radiator, commonly used in residential and commercial heating systems. Here's a breakdown of what each part of the term means:
Single: This indicates that the radiator has one panel, which is the flat metal surface that emits heat into the room.
Type 11: This refers to the configuration of the radiator. In a Type 11 radiator, there is one panel and one convector (a set of fins attached to the back of the panel to increase heat output).