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.

Vaillant 0020107779 Diaphragm

Part: 0020107779

Price: £6.86
Ariston 60081977 Diaphragm

Part: 60081977

Price: £14.17
Chaffoteaux 571547 Diaphragm

Part: 571547

Price: £4.00
Chaffoteaux 60010419 Diaphragm

Part: 60010419

Price: £4.35
Ariston 60081417 Bearing Plate Assy

Part: 60081417

Price: £49.62
Chaffoteaux 60019016-10 Diaphragm

Part: 60019016-10

Price: £12.00
Ideal 075487 Mini Disc For CH Hydraulic

Part: 075487

Price: £8.67
Main Diaphragm (Flow-CH) 248619

Part: 248619

Price: £6.45
Sime Diaphragm Kit 6281540

Part: 6281540

Price: £41.86
Alpha 6.1000801 Diaphragm

Part: 6.1000801

Price: £8.00
Potterton Diaphragm Repair Kit 5111137

Part: 5111137

Price: £8.95
Biasi BI1011111 Pressure Switch Disc (CH)

Part: BI1011111

Price: £8.71
Ariston 61301782 Diaphragm

Part: 61301782

Price: £7.05
Chaffoteaux 60025809-30 Diaphragm

Part: 60025809-30

Price: £8.15
Vokera 4298 Flow Switch Diaphragm

Part: 4298

Price: £4.50
Vaillant Diaphragm Disc - 010006

Part: 010006

Price: £6.88
Baxi 248065 Combi (CH) Diaphragm

Part: 248065

Price: £9.78
Chaffoteaux 571441 Pressure Switch

Part: 571441

Price: £19.67
Main Diaphragm Repair Kit 5111138

Part: 5111138

Price: £8.95
Vaillant Diaphragm Disc - 010456

Part: 010456

Price: £6.49
Alpha 6.5405320 Primary Flow Diaphragm

Part: 6.5405320

Price: £7.62
Main Medway Super, Thames Diaphragm 10/17467

Part: 10/17467

Price: £19.15
Chaffoteaux 60100506-30 Celtic Repair Kit

Part: 60100506-30

Price: £42.66
Vaillant 010375 Diaphragm

Part: 010375

Price: £20.05
Vaillant Diaphragm - 010354

Part: 010354

Price: £7.72
Main Diaphragm Repair Kit 5111140

Part: 5111140

Price: £7.95
Ariston 60034118 Bearing Ring

Part: 60034118

Price: £7.04
Sime 6153101 Diaphragm

Part: 6153101

Price: £17.95
Ariston 60019016-10 Diaphragm

Part: 60019016-10

Price: £12.00
Ideal 173495 Diaphragm

Part: 173495

Price: £19.95
Ariston 571547 Diaphragm

Part: 571547

Price: £4.00
Vokera 0714 Diaphragm

Part: 0714

Price: £3.95
Vaillant 010365 Diaphragm

Part: 010365

Price: £7.00
Vaillant Diaphragm Disc 0020039718

Part: 0020039718

Price: £7.02
Vaillant Diaphragm - 010347

Part: 010347

Price: £11.32
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