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.

Alpha 6.5405320 Primary Flow Diaphragm

Part: 6.5405320

Price: £6.74
Chaffoteaux 571547 Diaphragm

Part: 571547

Price: £4.00
Biasi BI1011114 Pressure Disc (DHW)

Part: BI1011114

Price: £13.65
Glowworm S801191 Diaphragm

Part: S801191

Price: £4.95
Potterton Diaphragm 10/12460

Part: 10/12460

Price: £17.11
Vokera 0557 Flow Switch Diaphragm

Part: 0557

Price: £4.25
Main Diaphragm Repair Kit 5111137

Part: 5111137

Price: £8.95
Chaffoteaux 571441 Pressure Switch

Part: 571441

Price: £26.99
Baxi 10/17549 Diaphragm

Part: 10/17549

Price: £7.55
Chaffoteaux 60019016-10 Diaphragm

Part: 60019016-10

Price: £12.00
Vaillant 010365 Diaphragm

Part: 010365

Price: £7.00
Vokera 4298 Flow Switch Diaphragm

Part: 4298

Price: £4.50
Chaffoteaux 60100506-30 Celtic Repair Kit

Part: 60100506-30

Price: £42.66
Ravenheat 5012051 Diverter Valve Diaphragm

Part: 5012051

Price: £19.95
Ariston 571547 Diaphragm

Part: 571547

Price: £4.00
Ariston 60019016-10 Diaphragm

Part: 60019016-10

Price: £12.00
Baxi 248065 Combi (CH) Diaphragm

Part: 248065

Price: £6.45
Ariston 570720 Service Kit

Part: 570720

Price: £24.59
Potterton Performa Diaphragm 248619

Part: 248619

Price: £6.45
Ariston 61301782 Diaphragm

Part: 61301782

Price: £7.63
Alpha 6.1000801 Diaphragm

Part: 6.1000801

Price: £8.00
Biasi BI1011111 Pressure Switch Disc (CH)

Part: BI1011111

Price: £8.71
Main Medway Super, Thames Diaphragm 10/17467

Part: 10/17467

Price: £19.15
Alpha 6.1000765 Diaphragm Repair Kit

Part: 6.1000765

Price: £11.00
Chaffoteaux 60010419 Diaphragm

Part: 60010419

Price: £3.96
Main Diaphragm (Flow-CH) 248065

Part: 248065

Price: £6.45
Ideal 173495 Diaphragm

Part: 173495

Price: £19.95
Ideal 075487 Mini Disc For CH Hydraulic

Part: 075487

Price: £8.67
Vaillant 010375 Diaphragm

Part: 010375

Price: £19.67
Chaffoteaux 61301782 Diaphragm

Part: 61301782

Price: £7.63
Vaillant 0020107779 Diaphragm

Part: 0020107779

Price: £6.73
Sime 6153101 Diaphragm

Part: 6153101

Price: £17.95
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