Also referred to as control knobs and temperature knobs, they usually sit on a spindle located on the front of the boiler the spindle when turned, turns a potentiometer that’s located on the printed circuit board and if the knob is turned too hard the spindle is designed to break hence protecting the printed circuit board from damage and an expensive repair, the knob allows you to manually control aspects of the functionality of the boiler. Some boilers allow you to change temperature and some even enable you to change the current function. This means you can have the boiler generate hot water without the central heating being on or central heating on without hot water.

Biasi BI1605106 Riva Compact Knob

Part: BI1605106

Price: £4.14
Main Control Knob 248092

Part: 248092

Price: £6.31
Main Knob Selector Switch 5107344

Part: 5107344

Price: £4.15
Halstead Finest Knob Plastic 300656

Part: 300656

Price: £10.56
Main Knob 226656

Part: 226656

Price: £7.85
Potterton Control Knob Assembly 226656

Part: 226656

Price: £7.85
Main Control Knob 26002014

Part: 26002014

Price: £8.66
Glowworm 2000448323 Ember Control Knob

Part: 2000448323

Price: £9.81
Baxi 248092 Combi Selector Knob

Part: 248092

Price: £6.31
Baxi 230282BAX Bermuda Adaptor Knob

Part: 230282BAX

Price: £21.57
Main 0350395 Knob

Part: 0350395

Price: £3.96
Main Knob 5110845

Part: 5110845

Price: £13.52
Ferroli 39812280 Optimax Control Knob

Part: 39812280

Price: £33.70
Chaffoteaux 569424 On/Off Neon Switch

Part: 569424

Price: £3.96
Potterton Knob 5110845

Part: 5110845

Price: £13.52
Saunier Duval S427524 Control Knob

Part: S427524

Price: £12.36
Ideal 172442 Boxer Control Knob

Part: 172442

Price: £11.35
Glowworm 2000800400 Ultimate Control Knob

Part: 2000800400

Price: £8.37
Ideal 172554 Mini Control Knob

Part: 172554

Price: £3.96
Potterton Control Knob Selector 005409681

Part: 005409681

Price: £5.14
Potterton Control Knob 0520799

Part: 0520799

Price: £15.57
Worcester Bosch 87161410210 CDI Selector Knob

Part: 87161410210

Price: £4.70
Chaffoteaux 998603 Knob

Part: 998603

Price: £6.00
Ideal 170859 Concord Control Knob

Part: 170859

Price: £14.86
Baxi 249119 Knob

Part: 249119

Price: £3.96
Baxi 240829 Bermuda Lfe 5 Control Knob

Part: 240829

Price: £11.75
Ideal 172491 Icos Isar Knob

Part: 172491

Price: £5.35
Main Control Knob 234551

Part: 234551

Price: £11.48
Potterton 5107345 Control Knob

Part: 5107345

Price: £3.96
Glowworm S205146 Micron Control Knob

Part: S205146

Price: £6.57
Potterton Control Knob 0544659

Part: 0544659

Price: £14.03
Main Control Knob 5118397

Part: 5118397

Price: £13.37
Ariston 60074477 Knob

Part: 60074477

Price: £3.96
Ferroli 39801950 Pegasus Knob

Part: 39801950

Price: £11.65
Ariston 65100687 Microgenus Knob

Part: 65100687

Price: £3.96
Baxi 233466 Bermuda Control Knob

Part: 233466

Price: £11.55
Saunier Duval Knob 2000801872

Part: 2000801872

Price: £23.71
Main Control Knob Assembly 233466

Part: 233466

Price: £11.55
Main Control Knob 043115

Part: 043115

Price: £8.32
Baxi 222039 Control Knob

Part: 222039

Price: £7.87
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