Also known as a membrane, it is a boiler part that is normally located within the diverter valve or hydraulic section of the combination boiler. Its main purpose is to move a pin that then operates a microswitch which in turn sends a signal to the printed circuit board. The signal is normally to indicate the pump is running or there is a demand for hot water. They are sometimes also referred to as the pump proving – flow diaphragm or the domestic hot water DHW diaphragm, having this feature is what makes a combi boiler so popular due to the fact the boiler can provide hot water and heating without the need for a cylinder.

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Halstead 840505 Domestic Hot Water (DHW) Diaphragm

Part: 840505

Price: £10.00
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Vaillant 010375 Diaphragm

Part: 010375

Price: £19.67
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Halstead 840501 Pressure Switch Service Kit

Part: 840501

Price: £20.00
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Biasi BI1011114 Pressure Disc (DHW)

Part: BI1011114

Price: £13.65
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Heatline D002192607 Diaphragm

Part: D002192607

Price: £7.45
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Halstead 851130 Domestic Hot Water (DHW) Diaphragm

Part: 851130

Price: £20.00
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Baxi 5111138 Combi 105He (CH) Repair Kit Diaphragm

Part: 5111138

Price: £8.95
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Main Diaphragm Repair Kit 5111140

Part: 5111140

Price: £7.95
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Ravenheat 5012051 Diverter Valve Diaphragm

Part: 5012051

Price: £19.95
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Vaillant 0020107707 Diaphragm

Part: 0020107707

Price: £6.73
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Worcester Bosch 87005030500 R30He, R35He Diaphragm

Part: 87005030500

Price: £8.10
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Baxi 5111137 DHW Diaphragm Kit

Part: 5111137

Price: £8.95
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Potterton Performa 24I He Diaphragm Replacement Kit DHW 5111140

Part: 5111140

Price: £7.95
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Ariston 60019016-10 Diaphragm

Part: 60019016-10

Price: £12.00
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Main Medway Super, Thames Diaphragm 10/17467

Part: 10/17467

Price: £19.15
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Chaffoteaux 60010419 Diaphragm

Part: 60010419

Price: £3.96
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Main Diaphragm Repair Kit 5111139

Part: 5111139

Price: £7.95
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Alpha 6.5405330 Domestic Hot Water (DHW) Diaphragm

Part: 6.5405330

Price: £10.34
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Potterton Diaphragm Repair Kit 5111137

Part: 5111137

Price: £8.95
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Vaillant 0020107704 Diaphragm

Part: 0020107704

Price: £6.38
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Chaffoteaux 60100506-30 Celtic Repair Kit

Part: 60100506-30

Price: £42.66
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Alpha 6.1000765 Diaphragm Repair Kit

Part: 6.1000765

Price: £11.00
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Potterton Performa Diaphragm Replacement Kit 5111138

Part: 5111138

Price: £8.95
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Chaffoteaux 60081977 Diaphragm

Part: 60081977

Price: £16.49
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Ariston Diaphragm 61400278

Part: 61400278

Price: £11.67
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Ideal 173495 Diaphragm

Part: 173495

Price: £19.95
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Glowworm S801191 Diaphragm

Part: S801191

Price: £4.95
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Chaffoteaux 571547 Diaphragm

Part: 571547

Price: £4.00
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Main Diaphragm Repair Kit 5111137

Part: 5111137

Price: £8.95
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Vokera 4298 Flow Switch Diaphragm

Part: 4298

Price: £4.50
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Potterton Perfoma Diaphragm 248065

Part: 248065

Price: £6.45
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Main Diaphragm (Domestic Hot Water) 248838

Part: 248838

Price: £6.45
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Baxi 10/17549 Diaphragm

Part: 10/17549

Price: £7.55
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Vaillant 010365 Diaphragm

Part: 010365

Price: £7.00
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Ideal 075406 Domestic Hot Water (DHW) Diaphragm

Part: 075406

Price: £7.50
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Ideal 075421 Mini Central Heating Diaphragm

Part: 075421

Price: £5.95
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Ariston 60025809-30 Diaphragm

Part: 60025809-30

Price: £6.63
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Baxi 5111140 Combi Instant Repair Kit Diaphragm

Part: 5111140

Price: £7.95
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Ariston 571547 Diaphragm

Part: 571547

Price: £4.00
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Biasi BI1011103 Central Heating (CH) Diaphragm

Part: BI1011103

Price: £5.25
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Chaffoteaux 60100142-20 Britony 2 Diaphragm Repair Kit

Part: 60100142-20

Price: £15.37
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Alpha 6.5405320 Primary Flow Diaphragm

Part: 6.5405320

Price: £6.74
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Potterton Performa Diaphragm 248619

Part: 248619

Price: £6.45
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Ariston 61301782 Diaphragm

Part: 61301782

Price: £7.63
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Worcester Bosch 87161405530 Diverter Valve (DHW) Diaphragm

Part: 87161405530

Price: £33.46
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Potterton Performa Dhw Diaphragm 248066

Part: 248066

Price: £6.95
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Baxi 248838 Combi Instant (DHW) Diaphragm

Part: 248838

Price: £6.45
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Main Diaphragm (Flow-CH) 248619

Part: 248619

Price: £6.45
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Alpha 3.013389 Domestic Hot Water (DHW) Diaphragm

Part: 3.013389

Price: £20.00
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Sime 6153101 Diaphragm

Part: 6153101

Price: £17.95
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