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.

images/products/Heatline_Expansi_503f839d00e46
Heatline D003202562 Solaris Expansion Vessel

Part: D003202562

Price: £157.28
images/products/Chaffoteaux_Expa_511d114c8a726
Chaffoteaux 999403 Expansion Vessel

Part: 999403

Price: £88.75
images/products/Main_Expansion_V_510116a183f27
Main Expansion Vessel 5114692

Part: 5114692

Price: £54.95
images/products/Vaillant__Expans_51150738764ce
Vaillant 181051 EcoTec Expansion Vessel

Part: 181051

Price: £80.00
images/products/Ferroli__Expansi_516d163e04863
Ferroli 39800960 DomiCondense Opima 7L Expansion Vessel

Part: 39800960

Price: £83.00
images/products/Potterton_18_Lit_50b75f35b3301
Potterton 18 Litre Expansion Vessel P781

Part: P781

Price: £84.35
images/products/Worcester_Expans_4ebd4d236692a
Worcester Bosch 87161425000 CDI 10L Expansion Vessel

Part: 87161425000

Price: £84.42
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Ideal 175550 Independent Logic Expansion Vessel Pipe

Part: 175550

Price: £32.77
images/products/Saunier_Duval_Ex_501a9c2121b12
Saunier Duval Expansion vessel 2000800694

Part: 2000800694

Price: £118.35
images/products/5009057
Ravenheat Rav5009057 RSF Expansion Vessel

Part: 5009057

Price: £72.87
images/products/Ideal_Expansion__4ee61c5406f17
Ideal 170989 Esprit Icos Expansion Vessel

Part: 170989

Price: £168.97
images/products/7205423018
Potterton Expansion Vessel 720542301

Part: 720542301

Price: £69.63
images/products/720759301
Baxi 720759301 Megaflow Netatec Expansion Vessel

Part: 720759301

Price: £75.83
images/products/Baxi__Expansion__4f60a8c1d4223
Baxi 247431 Maxflow Combi Wm Expansion Vessel

Part: 247431

Price: £62.70
images/products/Potterton_Expans_4ea571f623e5d
Potterton Performa 28I Expansion Vessel With Storage 248722

Part: 248722

Price: £79.95
images/products/Chaffoteaux_Expa_501a98c04e744
Chaffoteaux 60000227 Expansion Vessel

Part: 60000227

Price: £102.40
images/products/Ariston_Expansio_519602f411f5b
Ariston 998616 Intesa Microgenus 6L Expansion Vessel

Part: 998616

Price: £89.35
8716117023
Worcester 8716117023 Greenstar Erp Expansion Vessel

Part: 8716117023

Price: £67.42
images/products/00200207441
Saunier Duval Expansion vessel 0020020744

Part: 0020020744

Price: £90.51
images/products/Ferroli_Expansio_4eb3ee93cf517
Ferroli 39809690 Domocompact 10 Litre Expansion Vessel

Part: 39809690

Price: £95.00
images/products/Baxi_Expansion_V_4f4cb2819b888
Baxi 5114692 DuoTec Platinum 10L Expansion Vessel

Part: 5114692

Price: £54.95
images/products/Baxi_Expansion_V_4ea571cdab503
Baxi 248722 Combi Instant Expansion Vessel

Part: 248722

Price: £79.95
175551
Ideal 175551 Logic Independent Expansion Vessel

Part: 175551

Price: £83.40
images/products/Ideal_Expansion__5244088f42b95
Ideal 075424 C80FF Wickes Expansion Vessel

Part: 075424

Price: £93.91
images/products/00200207448
Glowworm 0020020744 Flexicom Expansion Vessel

Part: 0020020744

Price: £90.51
images/products/Ferroli_Expansio_4ec512e66e635
Ferroli 39809150 76FF, 77FF DHW Expansion Vessel

Part: 39809150

Price: £143.82
images/products/65101719
Chaffoteaux 65101719 Expansion Vessel

Part: 65101719

Price: £106.26
images/products/Biasi_Expansion__4f0dac6459ecb
Biasi BI1182105 Riva Advance Garda He Plus Expansion Vessel

Part: BI1182105

Price: £53.64
images/products/Alpha_Expansion__4ec27b22f3e12
Alpha 1.023560 Expansion Vessel

Part: 1.023560

Price: £82.00
images/products/Saunier_Duval__E_4fbdfa6beeb53
Saunier Duval 0020057805 7L Expansion Vessel

Part: 0020057805

Price: £126.37
images/products/39804890
Ferroli 39804890 Modena Domina 80 (8 Litre) Expansion Vessel

Part: 39804890

Price: £85.00
images/products/Main_18_Litre__E_50b75f10f05b6
Main 18 Litre Expansion Vessel P781

Part: P781

Price: £84.35
images/products/Alpha__500E_Expa_4fbdface53918
Alpha 6.5634660 500E (7.5 Litre) Expansion Vessel

Part: 6.5634660

Price: £117.92
images/products/Baxi__Expansion__50aa64987fc57
Baxi 5113000 Combi Instant Expansion Vessel

Part: 5113000

Price: £78.46
images/products/238395
Baxi 238395 Genesis Expansion Vessel

Part: 238395

Price: £65.65
images/products/Worcester_Expans_4ebbfde7a463c
Worcester Bosch 87161425050 Heatslave 12 Litre Expansion Vessel

Part: 87161425050

Price: £102.90
images/products/Baxi_Expansion_V_4e9c2f616c966
Baxi 235883 Genesis Expansion Vessel

Part: 235883

Price: £132.56
images/products/Potterton_Expans_50eaeb8500f34
Potterton Performa Expansion Vessel 8 Litre 248024

Part: 248024

Price: £51.95
images/products/Alpha_Expansion__5123a02fbc270
Alpha 1.021528 240 280 (8 Litre) Expansion Vessel

Part: 1.021528

Price: £98.87
images/products/Potterton_Tank_E_4ef0678c1a898
Potterton Promax He System Expansion Vessel 240388

Part: 240388

Price: £102.76
images/products/Baxi_Expansion_V_4e9c2f616c966
Main Expansion Vessel 235883

Part: 235883

Price: £132.56
images/products/Vaillant_Expansi_50acdb7a3e83f
Vaillant 181057 Thermocompact 10 Litre Expansion Vessel

Part: 181057

Price: £106.18
images/products/Worcester_Expans_511d11c7aaafb
Worcester Bosch 87161165190 Greenstar 10 Litre Expansion Vessel

Part: 87161165190

Price: £86.31
images/products/7205423013
Baxi 720542301 Avanta Exclusive Plus Expansion Vessel

Part: 720542301

Price: £69.63
images/products/5106287
Main Expansion Vessel 5106287

Part: 5106287

Price: £109.57
images/products/8716119294
Expansion Vessel 8716119294 Greenstar Highflow Expansion Vessel

Part: 8716119294

Price: £102.12
images/products/Potterton_Expans_4e9c2f73aad5d
Potterton Expansion Vessel 235883

Part: 235883

Price: £132.56
10028603
Vokera 10028603 Expansion Vessel Flexi Pipe

Part: 10028603

Price: £13.32
images/products/Baxi_18_Litre__E_50b75ef8e1271
Baxi P781 18 Litre Expansion Vessel

Part: P781

Price: £84.35
images/products/Main__Expansion__50aa64a63590e
Main Expansion Vessel 5113000

Part: 5113000

Price: £78.46
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