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.

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Chaffoteaux 61312930 Minima Control Knob

Part: 61312930

Price: £4.70
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Main Control Knob 0520799

Part: 0520799

Price: £15.57
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Ariston 60074478 Knob

Part: 60074478

Price: £4.51
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Main Control Knob 234544

Part: 234544

Price: £11.03
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Potterton 5107345 Control Knob

Part: 5107345

Price: £3.96
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Potterton Control Knob Assembly 232705

Part: 232705

Price: £11.70
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Saunier Duval Control knob 0020084807

Part: 0020084807

Price: £10.70
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Potterton Control Knob 0520799

Part: 0520799

Price: £15.57
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Baxi 236462 Bahama Knob

Part: 236462

Price: £10.10
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Potterton Control Knob Kit 240829

Part: 240829

Price: £11.75
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Ideal 172491 Icos Isar Knob

Part: 172491

Price: £5.35
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Baxi 5116069 Duo-Tec Knob

Part: 5116069

Price: £3.96
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Baxi 5107345 Knob

Part: 5107345

Price: £3.96
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Chaffoteaux 998603 Knob

Part: 998603

Price: £6.00
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Potterton Control Knob 0544659

Part: 0544659

Price: £14.03
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Potterton Control Knob Assembly 237879

Part: 237879

Price: £9.98
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Baxi 230276BAX Bermuda Adaptor Knob

Part: 230276BAX

Price: £10.30
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Saunier Duval S427524 Control Knob

Part: S427524

Price: £12.36
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Main Control Knob Assembly 090159

Part: 090159

Price: £11.24
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Potterton 200277 Netaheat Thermostat Control Knob

Part: 200277

Price: £9.68
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Potterton Control Knob Assembly 226656

Part: 226656

Price: £7.85
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Main Knob Assembly 960HP/1051

Part: 960HP/1051

Price: £8.86
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Main Control Knob 26002014

Part: 26002014

Price: £8.66
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Chaffoteaux 992027 Knob

Part: 992027

Price: £3.96
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Ideal 013241 Concord Super Control Knob

Part: 013241

Price: £14.92
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Baxi 249119 Knob

Part: 249119

Price: £3.96
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Potterton Control Knob Assembly 234544

Part: 234544

Price: £11.03
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Biasi BI1005503 Riva Prisma Control Knob

Part: BI1005503

Price: £3.96
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Biasi BI1605106 Riva Compact Knob

Part: BI1605106

Price: £4.14
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Main Control Knob Assembly 233466

Part: 233466

Price: £11.55
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Ferroli 39812350 Domicompact Knob

Part: 39812350

Price: £6.86
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Ariston 60074477 Knob

Part: 60074477

Price: £3.96
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Ariston 60074469 Knob

Part: 60074469

Price: £4.09
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Main Knob 5110844

Part: 5110844

Price: £15.66
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Main Knob Selector Switch 5116069

Part: 5116069

Price: £3.96
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Potterton Control Knob 224037

Part: 224037

Price: £5.62
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Ariston 61010740 Knob

Part: 61010740

Price: £3.96
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Baxi 238034BAX Bermuda PW5 Control Knob

Part: 238034BAX

Price: £11.48
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Ferroli 39808930 Domina (Pack Of Three) Knob

Part: 39808930

Price: £6.36
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Heatline D001060144 Vizo Control Knob

Part: D001060144

Price: £33.62
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Potterton Control Knob Selector 005409681

Part: 005409681

Price: £5.14
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Chaffoteaux 60074810 Celt Star Hot Cold Knob

Part: 60074810

Price: £4.35
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Potterton Control Knob 249119

Part: 249119

Price: £3.96
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Baxi 227306 Bermuda SP2 Control Knob

Part: 227306

Price: £8.84
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Potterton Control Knob Assembly 234643

Part: 234643

Price: £21.95
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Baxi 248092 Combi Selector Knob

Part: 248092

Price: £6.31
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Main Control Knob 230981

Part: 230981

Price: £8.66
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Potterton Control Knob 092020

Part: 092020

Price: £13.43
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Glowworm S204698 Micron Control Knob

Part: S204698

Price: £6.31
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Glowworm 2000448323 Ember Control Knob

Part: 2000448323

Price: £9.81
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