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
Potterton Performa Diaphragm 248619

Part: 248619

Price: £6.45
Sime 6153101 Diaphragm

Part: 6153101

Price: £17.95
Main Diaphragm Repair Kit 5111140

Part: 5111140

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

Part: 248065

Price: £9.78
Sime Diaphragm Kit 6281540

Part: 6281540

Price: £41.86
Main Diaphragm Repair Kit 5111137

Part: 5111137

Price: £8.95
Baxi 248066 Combi (DHW) Diaphragm

Part: 248066

Price: £6.95
Biasi BI1011114 Pressure Disc (DHW)

Part: BI1011114

Price: £13.65
Chaffoteaux 61301782 Diaphragm

Part: 61301782

Price: £7.63
Ariston 570720 Service Kit

Part: 570720

Price: £24.59
Chaffoteaux 571547 Diaphragm

Part: 571547

Price: £4.00
Ariston 60025809-30 Diaphragm

Part: 60025809-30

Price: £6.63
Main Medway Trent Diaphragm 10/12460

Part: 10/12460

Price: £17.11
Chaffoteaux Diaphragm 61400278

Part: 61400278

Price: £11.67
Vaillant 0020107707 Diaphragm

Part: 0020107707

Price: £6.73
Alpha 6.1000801 Diaphragm

Part: 6.1000801

Price: £8.00
Main Diaphragm Repair Kit 5111138

Part: 5111138

Price: £8.95
Vaillant 0020107779 Diaphragm

Part: 0020107779

Price: £6.73
Ariston 571547 Diaphragm

Part: 571547

Price: £4.00
Baxi 5111137 DHW Diaphragm Kit

Part: 5111137

Price: £8.95
Vokera 0714 Diaphragm

Part: 0714

Price: £3.95
Vokera 4298 Flow Switch Diaphragm

Part: 4298

Price: £4.50
Baxi 10/17549 Diaphragm

Part: 10/17549

Price: £7.55
Chaffoteaux 571441 Pressure Switch

Part: 571441

Price: £26.99
Ariston 60034118 Bearing Ring

Part: 60034118

Price: £7.04
Chaffoteaux 60025809-30 Diaphragm

Part: 60025809-30

Price: £6.63
Potterton Performa Dhw Diaphragm 248066

Part: 248066

Price: £6.95
Biasi BI1011111 Pressure Switch Disc (CH)

Part: BI1011111

Price: £8.71
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