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.

Baxi 236394 Baroque Control Knob

Part: 236394

Price: £10.20
Glowworm 2000801872 CXI Knob

Part: 2000801872

Price: £23.71
Potterton Control Knob Assembly 237879

Part: 237879

Price: £9.98
Biasi BI1515101 Riva Compact Knob

Part: BI1515101

Price: £3.96
Potterton Control Knob Assembly 234643

Part: 234643

Price: £29.95
Glowworm S204698 Micron Control Knob

Part: S204698

Price: £6.31
Potterton Control Knob Assembly 234551

Part: 234551

Price: £11.48
Baxi 236462 Bahama Knob

Part: 236462

Price: £10.10
Potterton Control Knob Assembly 234544

Part: 234544

Price: £11.03
Chaffoteaux 998603 Knob

Part: 998603

Price: £6.00
Ariston 60081979 Britony Combi Knob

Part: 60081979

Price: £5.95
Baxi 236462BAX Genesis Knob

Part: 236462BAX

Price: £11.37
Main Control Knob 240829

Part: 240829

Price: £11.75
Main Control Knob Assembly 090159

Part: 090159

Price: £11.24
Saunier Duval S204698 Control Knob

Part: S204698

Price: £6.31
Baxi 238034BAX Bermuda PW5 Control Knob

Part: 238034BAX

Price: £11.48
Potterton 5107345 Control Knob

Part: 5107345

Price: £3.96
Baxi 0350395 Knob

Part: 0350395

Price: £3.96
Sime 6290100 Format Knob

Part: 6290100

Price: £4.30
Main Knob 5110845

Part: 5110845

Price: £13.52
Baxi 222039 Control Knob

Part: 222039

Price: £7.87
Ariston 61011699 Knob

Part: 61011699

Price: £9.20
Potterton Knob Selector Switch 5116069

Part: 5116069

Price: £3.96
Glowworm S448103 Fire Control Knob

Part: S448103

Price: £7.73
Baxi 5110844 Main Multipoint Knob

Part: 5110844

Price: £15.66
Ariston 60074477 Knob

Part: 60074477

Price: £3.96
Main 0350395 Knob

Part: 0350395

Price: £3.96
Main Control Knob Assembly 237879

Part: 237879

Price: £9.98
Ariston 61001495 Knob

Part: 61001495

Price: £4.35
Main Control Knob 248092

Part: 248092

Price: £6.31
Baxi 26002014 Knob

Part: 26002014

Price: £8.66
Halstead 300667 Ace Wickes Control Knob

Part: 300667

Price: £12.14
Worcester Bosch 87161411160 350Rsf Knob

Part: 87161411160

Price: £22.32
Potterton Control Knob 222039

Part: 222039

Price: £7.87
Potterton Control Knob Kit 5118397

Part: 5118397

Price: £13.37
Glowworm 0020084807 Betacom Control Knob

Part: 0020084807

Price: £10.70
Baxi 5118397 Duo-Tec Control Knob

Part: 5118397

Price: £13.37
Chaffoteaux 61312930 Minima Control Knob

Part: 61312930

Price: £4.70
Chaffoteaux 65100687 Knob

Part: 65100687

Price: £3.96
Baxi 960HP/1051 Knob

Part: 960HP/1051

Price: £8.86
Biasi BI1605106 Riva Compact Knob

Part: BI1605106

Price: £4.14
Main Knob 5110844

Part: 5110844

Price: £15.66
Sime 6230921 Dewy Planet Control Knob

Part: 6230921

Price: £4.30
Potterton 042871 Control Knob

Part: 042871

Price: £15.20
Ariston 60074469 Knob

Part: 60074469

Price: £4.09
Alpha 1.014054 CB CD Selector Knob

Part: 1.014054

Price: £3.96
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