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.

18 Litre Poatable Expansion Vessel4
Heatrae Sadia 18L Potable Expansion Vessel

Part:

Price: £39.95
Fitting1
Expansion Vessel 3/4" x 22mm Brass Fitting

Part:

Price: £3.95
Expansion Vessel5
Heatrae Sadia Potable Expansion Vessel Bracket

Part:

Price: £6.95
35 Litre Potable Expansion Vessel
Heatrae Sadia 35L Potable Expansion Vessel

Part:

Price: £94.50
24 Litre Potable Expansion Vessel
Heatrae Sadia 24L Potable Expansion Vessel

Part:

Price: £48.75
18 Litre Poatable Expansion Vessel
Heatrae Sadia 18L Potable Expansion Vessel

Part:

Price: £39.95
12 Litre Potable Expansion Vessel
Heatrae Sadia 12L Potable Expansion Vessel

Part:

Price: £29.95
8 Litre Potable Expansion Vessel
Heatrae Sadia 8L Potable Expansion Vessel

Part:

Price: £29.95
864067-3
Intergas Rapid Expansion Vessel

Part: 864067

Price: £77.00
864107-2
Intergas Expansion Vessel

Part: 864107

Price: £77.00
images/products/51146916
Main 5114691 Combi Eco Elite Expansion Vessel

Part: 5114691

Price: £63.66
images/products/Alpha__500E_Expa_4fbdface53918
Alpha 6.5634660 500E (7.5 Litre) Expansion Vessel

Part: 6.5634660

Price: £133.28
images/products/Alpha_Expansion__4ec27b22f3e12
Alpha 1.023560 Expansion Vessel

Part: 1.023560

Price: £82.00
images/products/Alpha_Expansion__5123a02fbc270
Alpha 1.021528 240 280 (8 Litre) Expansion Vessel

Part: 1.021528

Price: £102.33
images/products/Alpha_Expansion__51225baf127f4
Alpha 1.018837 CB50 CD50 DHW Expansion Vessel

Part: 1.018837

Price: £109.92
images/products/1.019603
Alpha 1.019603 CD50 Fixing Strap For Expansion Vessel

Part: 1.019603

Price: £4.35
images/products/1.030996
Alpha 1.030996 Intec 2, Eco 2 Expansion Vessel

Part: 1.030996

Price: £87.26
images/products/5106287
Baxi 5106287 Powermax He Expansion Vessel

Part: 5106287

Price: £109.57
images/products/Baxi_Was_Part_Nu_4ef06762cb3df
Baxi 240388 Solo Bahama Combi He Plus Expansion Vessel

Part: 240388

Price: £102.76
images/products/7207782014
Baxi 720778201 EcoBlue Hose For Expansion Vessel

Part: 720778201

Price: £22.97
images/products/2480252
Baxi 248025 Combi 80E Pipe For Expansion Vessel

Part: 248025

Price: £8.66
images/products/Baxi_18_Litre__E_50b75ef8e1271
Baxi P781 18 Litre Expansion Vessel

Part: P781

Price: £84.35
images/products/720759301
Baxi 720759301 Megaflow Netatec Expansion Vessel

Part: 720759301

Price: £75.83
images/products/7205423013
Baxi 720542301 Avanta Exclusive Plus Expansion Vessel

Part: 720542301

Price: £69.63
images/products/Baxi_Expansion_V_50192baa15e07
Baxi 26009157 Vessel

Part: 26009157

Price: £123.11
images/products/Baxi_Expansion_V_4f4cb2819b888
Baxi 5114692 DuoTec Platinum 10L Expansion Vessel

Part: 5114692

Price: £59.95
images/products/5114691
Baxi 5114691 Duo-Tec, Megaflow, Platinum 8L Expansion Vessel

Part: 5114691

Price: £63.66
images/products/Baxi__Expansion__50aa64987fc57
Baxi 5113000 Combi Instant Expansion Vessel

Part: 5113000

Price: £78.46
images/products/Baxi_Expansion_V_4ea571cdab503
Baxi 248722 Combi Instant Expansion Vessel

Part: 248722

Price: £79.95
images/products/248024
Baxi 248024 Combi Expansion Vessel

Part: 248024

Price: £51.95
images/products/26009157
Potterton Statesman Expansion Vessel 26009157

Part: 26009157

Price: £123.11
images/products/7207782016
Potterton 720778201 Hose Expansion Vessel

Part: 720778201

Price: £22.97
images/products/5106287
Potterton Expansion Vessel 12 Litre 5106287

Part: 5106287

Price: £109.57
images/products/248025
Potterton 248025 Pipe Expansion Vessel

Part: 248025

Price: £8.66
images/products/Potterton_18_Lit_50b75f35b3301
Potterton 18 Litre Expansion Vessel P781

Part: P781

Price: £84.35
images/products/7205423018
Potterton Expansion Vessel 720542301

Part: 720542301

Price: £69.63
images/products/Potterton__Expan_510116b850a1c
Potterton Expansion Vessel 5114692

Part: 5114692

Price: £59.95
images/products/51146916
Potterton Expansion Vessel 5114691

Part: 5114691

Price: £63.66
images/products/Potterton__Expan_508689cb53545
Potterton Performa 24I He Expansion Storage Vessel 5113000

Part: 5113000

Price: £78.46
images/products/Potterton_Expans_4ea571f623e5d
Potterton Performa 28I Expansion Vessel With Storage 248722

Part: 248722

Price: £79.95
images/products/Potterton_Expans_50eaeb8500f34
Potterton Performa Expansion Vessel 8 Litre 248024

Part: 248024

Price: £51.95
images/products/Potterton__Expan_4f60a8e0e9c67
Potterton Expansion Vessel 247431

Part: 247431

Price: £62.70
images/products/Potterton_Tank_E_4ef0678c1a898
Potterton Promax He System Expansion Vessel 240388

Part: 240388

Price: £102.76
images/products/Potterton_Expans_4e9c2f73aad5d
Potterton Expansion Vessel 235883

Part: 235883

Price: £132.56
images/products/Saunier_Duval__E_4fbdfa6beeb53
Saunier Duval 0020057805 7L Expansion Vessel

Part: 0020057805

Price: £128.89
images/products/Saunier_Duval_Ho_4f1c08de1405b
Saunier Duval Hose expansion vessel 0020048900

Part: 0020048900

Price: £27.41
images/products/Saunier_Duval_Ex_501a9c2121b12
Saunier Duval Expansion vessel 2000800694

Part: 2000800694

Price: £120.71
images/products/00200207441
Saunier Duval Expansion vessel 0020020744

Part: 0020020744

Price: £79.95
Expansion_Vessel_532ae9539fc14
Sime 5139140 Format Expansion Vessel

Part: 5139140

Price: £62.95
5139100
Sime 5139100 Friendly Expansion Vessel

Part: 5139100

Price: £55.45
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