This part is in the boiler to protect the boiler from excessive surges and that the pressure within the boiler operates within safe parameters normally between 1 to 2.5 bar. The expansion vessel is filled half full of air and half full of water. The most common issues customer’s encounter when the expansion vessel is faulty is the boiler pressure builds to 3 bar and hot water starts to drip through the pressure relief valve and outside via the discharge pipe. When the boiler then cools down the pressure in the boiler falls to 0 bar and won’t fire up. The customer then has to fill the boiler back up by using the filling loop normally located below the boiler. Once the pressure in the boiler is back at 1 -1.5bar the boiler will start to work again.

Saunier Duval Expansion vessel 0020020744

Part: 0020020744

Price: £90.51
Baxi 248722 Combi Instant Expansion Vessel

Part: 248722

Price: £79.95
Vokera 10020839 Mynute Expansion Vessel

Part: 10020839

Price: £115.53
Chaffoteaux 60000227 Expansion Vessel

Part: 60000227

Price: £102.40
Baxi Expansion Vessel 5117636

Part: 5117636

Price: £97.68
Potterton Expansion Vessel 5114692

Part: 5114692

Price: £59.95
Saunier Duval Expansion vessel 2000800694

Part: 2000800694

Price: £118.35
Main Expansion Vessel 5106287

Part: 5106287

Price: £109.57
Heatline D003201948 Sargon Vizo Expansion Vessel

Part: D003201948

Price: £157.28
Remeha Expansion Vessel S62753

Part: S62753

Price: £78.34
Main Expansion Vessel 235883

Part: 235883

Price: £132.56
Glowworm 0020020744 Flexicom Expansion Vessel

Part: 0020020744

Price: £90.51
Potterton Statesman Expansion Vessel 26009157

Part: 26009157

Price: £123.11
Baxi 26009157 Vessel

Part: 26009157

Price: £123.11
Ferroli 39846250 Modena HE Expansion Vessel

Part: 39846250

Price: £108.15
Potterton Expansion Vessel S62753

Part: S62753

Price: £78.34
Vokera 7620 Mynute Expansion Vessel

Part: 7620

Price: £95.40
Vokera 10020840 Mynute Expansion Vessel

Part: 10020840

Price: £91.58
Vaillant 181051 EcoTec Expansion Vessel

Part: 181051

Price: £80.00
Main 18 Litre Expansion Vessel P781

Part: P781

Price: £84.35
Heatline Expansion vessel 8Lt 0020126680

Part: 0020126680

Price: £99.95
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