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.

Ariston 61301782 Diaphragm

Part: 61301782

Price: £7.63
Main Medway Super, Thames Diaphragm 10/17467

Part: 10/17467

Price: £19.15
Biasi BI1011111 Pressure Switch Disc (CH)

Part: BI1011111

Price: £8.71
Ideal 173495 Diaphragm

Part: 173495

Price: £19.95
Baxi 248065 Combi (CH) Diaphragm

Part: 248065

Price: £9.78
Sime 6153101 Diaphragm

Part: 6153101

Price: £17.95
Heatline D002192607 Diaphragm

Part: D002192607

Price: £7.45
Baxi 10/17549 Diaphragm

Part: 10/17549

Price: £7.55
Alpha 6.1000801 Diaphragm

Part: 6.1000801

Price: £8.00
Vaillant 0020107779 Diaphragm

Part: 0020107779

Price: £6.73
Potterton Diaphragm 10/12460

Part: 10/12460

Price: £17.11
Baxi 5111137 DHW Diaphragm Kit

Part: 5111137

Price: £8.95
Alpha 6.1000765 Diaphragm Repair Kit

Part: 6.1000765

Price: £11.00
Chaffoteaux Diaphragm 61400278

Part: 61400278

Price: £11.67
Main Diaphragm (Flow-CH) 248619

Part: 248619

Price: £6.45
Chaffoteaux 571547 Diaphragm

Part: 571547

Price: £4.00
Main Diaphragm Repair Kit 5111140

Part: 5111140

Price: £7.95
Main Diaphragm (Flow-CH) 248065

Part: 248065

Price: £9.78
Potterton Diaphragm Repair Kit 5111137

Part: 5111137

Price: £8.95
Ariston 60025809-30 Diaphragm

Part: 60025809-30

Price: £6.63
Main Diaphragm Repair Kit 5111138

Part: 5111138

Price: £8.95
Ariston 60081977 Diaphragm

Part: 60081977

Price: £16.49
Vokera 0557 Flow Switch Diaphragm

Part: 0557

Price: £4.25
Chaffoteaux 60100506-30 Celtic Repair Kit

Part: 60100506-30

Price: £42.66
Ravenheat 5012051 Diverter Valve Diaphragm

Part: 5012051

Price: £19.95
Vaillant 0020107704 Diaphragm

Part: 0020107704

Price: £6.38
Vaillant 010365 Diaphragm

Part: 010365

Price: £7.00
Potterton Perfoma Diaphragm 248065

Part: 248065

Price: £9.78
Main Diaphragm Repair Kit 5111139

Part: 5111139

Price: £7.95
Ariston 570720 Service Kit

Part: 570720

Price: £24.59
Vaillant 0020107707 Diaphragm

Part: 0020107707

Price: £6.73
Chaffoteaux 60019016-10 Diaphragm

Part: 60019016-10

Price: £12.00
Ariston 571547 Diaphragm

Part: 571547

Price: £4.00
Glowworm S801191 Diaphragm

Part: S801191

Price: £4.95
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