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.

Baxi 248066 Combi (DHW) Diaphragm

Part: 248066

Price: £6.95
Main Diaphragm Repair Kit 5111139

Part: 5111139

Price: £7.95
Vokera 4298 Flow Switch Diaphragm

Part: 4298

Price: £4.50
Vokera 0714 Diaphragm

Part: 0714

Price: £3.95
Potterton Perfoma Diaphragm 248065

Part: 248065

Price: £6.45
Ariston 61301782 Diaphragm

Part: 61301782

Price: £7.63
Main Diaphragm (Flow-CH) 248619

Part: 248619

Price: £6.45
Vaillant 010375 Diaphragm

Part: 010375

Price: £19.67
Potterton Diaphragm 10/12460

Part: 10/12460

Price: £17.11
Alpha 6.1000801 Diaphragm

Part: 6.1000801

Price: £8.00
Baxi 248838 Combi Instant (DHW) Diaphragm

Part: 248838

Price: £6.45
Ideal 075487 Mini Disc For CH Hydraulic

Part: 075487

Price: £8.67
Ariston 60019016-10 Diaphragm

Part: 60019016-10

Price: £12.00
Ariston 60025809-30 Diaphragm

Part: 60025809-30

Price: £6.63
Baxi 10/17549 Diaphragm

Part: 10/17549

Price: £7.55
Main Diaphragm Repair Kit 5111137

Part: 5111137

Price: £8.95
Chaffoteaux 60010419 Diaphragm

Part: 60010419

Price: £3.96
Chaffoteaux 571547 Diaphragm

Part: 571547

Price: £4.00
Glowworm S801191 Diaphragm

Part: S801191

Price: £4.95
Potterton Performa Diaphragm 248619

Part: 248619

Price: £6.45
Chaffoteaux 60025809-30 Diaphragm

Part: 60025809-30

Price: £6.63
Heatline D002192607 Diaphragm

Part: D002192607

Price: £7.45
Vokera 0557 Flow Switch Diaphragm

Part: 0557

Price: £4.25
Ravenheat 5012051 Diverter Valve Diaphragm

Part: 5012051

Price: £19.95
Potterton Diaphragm Repair Kit 5111137

Part: 5111137

Price: £8.95
Chaffoteaux 60019016-10 Diaphragm

Part: 60019016-10

Price: £12.00
Vaillant 0020107707 Diaphragm

Part: 0020107707

Price: £6.73
Vaillant 0020107704 Diaphragm

Part: 0020107704

Price: £6.38
Biasi BI1011111 Pressure Switch Disc (CH)

Part: BI1011111

Price: £8.71
Main Diaphragm Repair Kit 5111140

Part: 5111140

Price: £7.95
Main Medway Super, Thames Diaphragm 10/17467

Part: 10/17467

Price: £19.15
Baxi 248065 Combi (CH) Diaphragm

Part: 248065

Price: £6.45
Baxi 5111137 DHW Diaphragm Kit

Part: 5111137

Price: £8.95
Main Diaphragm Repair Kit 5111138

Part: 5111138

Price: £8.95
Ariston 60081977 Diaphragm

Part: 60081977

Price: £16.49
Vaillant 020220 Diaphragm

Part: 020220

Price: £6.38
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