Compact Radiators

Compact Radiators are the standard steel panel radiators fitted in the vast majority of UK homes — available in K1 (Type 11), K2 (Type 22) and K3 (Type 33) configurations, plus the Type 21 double-panel-plus option. They're budget-friendly, quick to source, and sized to drop straight onto an existing pipe centre without re-plumbing, making them the default choice for replacements, new-builds and rental properties alike.

The type code tells you exactly what's behind the casing. K1 (Type 11) is a single panel with a single row of convector fins — slim at around 57mm deep, and best suited to hallways, cloakrooms or anywhere wall space is tight. Type 21 steps up to a double panel with one row of fins, giving roughly 40% more output than a K1 in the same footprint. K2 (Type 22) pairs a double panel with double convector fins for one of the highest outputs in the compact range, ideal for living rooms and larger bedrooms. K3 (Type 33) adds a third panel and third row of fins for maximum heat output where space allows.

All radiators in this collection are finished in durable white (RAL 9016), supplied with concealed wall-mounting brackets, and manufactured to BS EN 442, the European standard for radiator performance and pressure testing — so Watt and BTU/hr figures are directly comparable across the range when you're specifying a like-for-like swap. Most models carry a manufacturer's guarantee of 10 years or more against faults.

Not sure which type or size fits your room? Use our BTU Calculator to work out the output you need, or read our Picking Heaters and Radiators guide for help matching panel type to room size and insulation level. Looking for something with more visual impact than a standard panel? Browse our Designer Radiators or Vertical Traditional Radiators instead.