Vaillant Boiler Expansion Vessel 181051 + Pressure Relief Valve 96008LA
IN STOCK
FROM £59.69
Vaillant Boiler Expansion Vessel 181051 + Pressure Relief Valve 96008LA
Product Overview
The Vaillant Boiler Expansion Vessel 181051 with Pressure Relief Valve (PRV) 96008LA is a replacement hydraulic safety component kit designed for use within selected Vaillant heating systems.
The expansion vessel is a key component of a sealed heating system. It absorbs the increase in water volume as the system temperature rises, helping to maintain stable operating pressure. The pressure relief valve (PRV) provides additional protection by releasing excess system pressure when required, helping prevent pressure-related damage to the boiler and heating system.
ℹ️ Product Condition Options:
This part may be available in New or Refurbished condition. Please check the available options from the dropdown menu.
Technical Insight & Common Failure Symptoms
The expansion vessel contains an internal diaphragm and air chamber that manages pressure changes within a sealed heating system. Over time, the diaphragm can deteriorate or the vessel may lose its charge, reducing its ability to control system pressure.
The pressure relief valve is a safety device designed to discharge water if the boiler pressure rises above the safe operating level. A faulty PRV may leak or fail to reseal correctly after operation.
Typical symptoms linked to a faulty expansion vessel or PRV include:
- Boiler pressure rising excessively when heating is operating
- Pressure relief valve leaking or discharging water
- Frequent need to repressurise the heating system
- Boiler pressure dropping after operation
- Water escaping from the PRV discharge pipe
- Pressure-related boiler faults or lockouts
Replacing the expansion vessel and PRV together may help restore stable system pressure and reliable boiler operation.
Compatibility
Manufacturer Part Numbers (MPN):
- 181051 – Expansion Vessel
- 96008LA – Pressure Relief Valve (PRV)
This part is designed for selected models within the Vaillant range.
Please strictly verify the manufacturer part numbers 181051 and 96008LA against your boiler's technical manual, exploded parts diagram, or existing components before ordering to guarantee correct fitment.
Safety Advice
Boiler pressure components involve water, heating system pressure, and internal boiler assemblies. Installation and servicing must be carried out by a Gas Safe registered engineer in accordance with current regulations and manufacturer instructions.
This part fits the following boilers:
Fits Appliance(s)
GC No.
Vaillant Ecomax 613 VU126 E-C (Condensing System) 2000-2001
Vaillant Ecomax 613/2 E VU 126/2-C (Condensing System) 2001-2007
Vaillant Ecomax 618 VU196 E-C (Condensing System) 2000-2001
Vaillant Ecomax 618/2E VU186/2-C 2001-2007
Vaillant Ecomax 622 VU 246 E-C (Condensing System) 2000-2001
Vaillant Ecomax 622/2E VU 226/2-C 2001-2007
Vaillant Ecomax 635 E VU356-C 2004-2008
Vaillant Ecomax 635 VU (Condensing System) 2006-2008
Vaillant Ecomax 824/2E VUW 246/2-C 2001-2007
Vaillant Ecomax 824E VUW 246E-C 1999-2001
Vaillant Ecomax 828/2E VUW 286/2-C 2001-2007
Vaillant Ecomax 828E VUW 286 E-C 1999-2001
Vaillant Ecomax 835E VUW 356-C 2002 -2008
Vaillant Ecotec Exclusive 832 VUW 32/4 2007- 2016
Vaillant Ecotec Exclusive 835 VUW 356/5-7
Vaillant Ecotec Exclusive 838 VUW 386/4 2007-2016
Vaillant Ecotec Exclusive 843 VUW 436/5-7
Vaillant Ecotec Plus 612 VU 126/3-5 2005-2005
Vaillant Ecotec Plus 612 VU 126/3-5 R1 2005-2012
Vaillant Ecotec Plus 612 VU 126/5-5 2012-2012
Vaillant Ecotec Plus 612 VU 126/5-5 A R4 2015 Onwards
Vaillant Ecotec Plus 612 VU 126/5-5 R 6 2017 Onwards
Vaillant Ecotec Plus 612 VU 126/5-5 R1 2012-2013
Vaillant Ecotec Plus 612 VU 126/5-5 R2 2013-2015
Vaillant Ecotec Plus 612 VU 126/5-5 R4 2015-2015
Vaillant Ecotec Plus 612, 615, 618, 624, 630, 637
Vaillant Ecotec Plus 615 VU 156/3-5 2005-2005
Vaillant Ecotec Plus 615 VU 156/3-5 R1 2005-2012
Vaillant Ecotec Plus 615 VU 156/5-5 2012-2012
Vaillant Ecotec Plus 615 VU 156/5-5 A R4 2015 Onwards
Vaillant Ecotec Plus 615 VU 156/5-5 R 6 2017 Onwards
Vaillant Ecotec Plus 615 VU 156/5-5 R1 2012-2013
Vaillant Ecotec Plus 615 VU 156/5-5 R2 2013-2015
Vaillant Ecotec Plus 615 VU 156/5-5 R4 2015-2015
Vaillant Ecotec Plus 618 VU 186/3-5 2005-2005
Vaillant Ecotec Plus 618 VU 186/3-5 R1 2005-2012
Vaillant Ecotec Plus 618 VU 186/5-5 2012-2012 LPG
Vaillant Ecotec Plus 618 VU 186/5-5 2012-2012 NG
Vaillant Ecotec Plus 618 VU 186/5-5 A R4 2015 Onwards LPG
Vaillant Ecotec Plus 618 VU 186/5-5 A R4 2015 Onwards NG
Vaillant Ecotec Plus 618 VU 186/5-5 R 6 2017 Onwards LPG
Vaillant Ecotec Plus 618 VU 186/5-5 R 6 2017 Onwards NG
Vaillant Ecotec Plus 618 VU 186/5-5 R1 2012-2013 LPG
Vaillant Ecotec Plus 618 VU 186/5-5 R1 2012-2013 NG
Vaillant Ecotec Plus 618 VU 186/5-5 R2 2013-2015 LPG
Vaillant Ecotec Plus 618 VU 186/5-5 R2 2013-2015 NG
Vaillant Ecotec Plus 618 VU 186/5-5 R4 2015-2015 LPG
Vaillant Ecotec Plus 618 VU 186/5-5 R4 2015-2015 NG
Vaillant Ecotec Plus 624 VU 246/3-5 2005-2005
Vaillant Ecotec Plus 624 VU 246/3-5 R1 2005-2012
Vaillant Ecotec Plus 624 VU 246/5-5 2012-2012
Vaillant Ecotec Plus 624 VU 246/5-5 A R4 2015 Onwards
Vaillant Ecotec Plus 624 VU 246/5-5 R 6 2017 Onwards
Vaillant Ecotec Plus 624 VU 246/5-5 R1 2012-2013
Vaillant Ecotec Plus 624 VU 246/5-5 R2 2013-2015
Vaillant Ecotec Plus 624 VU 246/5-5 R4 2015-2015
Vaillant Ecotec Plus 630 VU 306/3-5 2005-2005
Vaillant Ecotec Plus 630 VU 306/3-5 R1 2005-2012
Vaillant Ecotec Plus 630 VU 306/5-5 2012-2012 LPG
Vaillant Ecotec Plus 630 VU 306/5-5 2012-2012 NG
Vaillant Ecotec Plus 630 VU 306/5-5 A R4 2015 Onwards LPG
Vaillant Ecotec Plus 630 VU 306/5-5 A R4 2015 Onwards NG
Vaillant Ecotec Plus 630 VU 306/5-5 R 6 2017 Onwards LPG
Vaillant Ecotec Plus 630 VU 306/5-5 R 6 2017 Onwards NG
Vaillant Ecotec Plus 630 VU 306/5-5 R1 2012-2013 LPG
Vaillant Ecotec Plus 630 VU 306/5-5 R1 2012-2013 NG
Vaillant Ecotec Plus 630 VU 306/5-5 R2 2013-2014 LPG
Vaillant Ecotec Plus 630 VU 306/5-5 R2 2013-2014 NG
Vaillant Ecotec Plus 630 VU 306/5-5 R4 2015-2015 LPG
Vaillant Ecotec Plus 630 VU 306/5-5 R4 2015-2015 NG
Vaillant Ecotec Plus 637 VU 376/3-5 R1 2006-2012
Vaillant Ecotec Plus 637 VU 376/5-5 2012-2012
Vaillant Ecotec Plus 637 VU 376/5-5 A R4 2015 Onwards
Vaillant Ecotec Plus 637 VU 376/5-5 R1 2012-2013
Vaillant Ecotec Plus 637 VU 376/5-5 R2 2013-2014
Vaillant Ecotec Plus 637 VU 376/5-5 R4 2015-2015
Vaillant Ecotec Plus 637 VU 386/5-5 R 6 2017 Onwards
Vaillant Ecotec Plus 824 VUW 246/3-5 2005-2012
Vaillant Ecotec Plus 824 VUW 246/3-5 R1 2005-2011
Vaillant Ecotec Plus 824 VUW 246/3-5 R3 2011-2012
Vaillant Ecotec Plus 824 VUW 246/5-5 2012-2012
Vaillant Ecotec Plus 824 VUW 246/5-5 R1 2012-2013
Vaillant Ecotec Plus 824 VUW 246/5-5 R2 2013-2015
Vaillant Ecotec Plus 824 VUW 246/5-5 R4 2015-2015
Vaillant Ecotec Plus 825 VUW 196/5-5 R6 2017 Onwards
Vaillant Ecotec Plus 825 VUW 256/5-5 R4 2015 Onwards
Vaillant Ecotec Plus 831 VUW 316/3-5 2005-2013
Vaillant Ecotec Plus 831 VUW 316/3-5 R1 2005-2011
Vaillant Ecotec Plus 831 VUW 316/3-5 R3 2011-2012
Vaillant Ecotec Plus 831 VUW 316/3-5 R5 2013-2013
Vaillant Ecotec Plus 831 VUW 316/5-5 2012-2012 LPG
Vaillant Ecotec Plus 831 VUW 316/5-5 2012-2012 NG
Vaillant Ecotec Plus 831 VUW 316/5-5 R1 2012-2013 LPG
Vaillant Ecotec Plus 831 VUW 316/5-5 R1 2012-2013 NG
Vaillant Ecotec Plus 831 VUW 316/5-5 R2 2013-2015 LPG
Vaillant Ecotec Plus 831 VUW 316/5-5 R2 2013-2015 NG
Vaillant Ecotec Plus 831 VUW 316/5-5 R4 2015-2015 LPG
Vaillant Ecotec Plus 831 VUW 316/5-5 R4 2015-2015 NG
Vaillant Ecotec Plus 832 VUW 246/5-5 R6 2017 Onwards LPG
Vaillant Ecotec Plus 832 VUW 246/5-5 R6 2017 Onwards NG
Vaillant Ecotec Plus 832 VUW 326/5-5 R4 2015 Onwards
Vaillant Ecotec Plus 835 VUW 306/5-5 R6 2017 Onwards
Vaillant Ecotec Plus 835 VUW 356/5-5 R4 2015 Onwards
Vaillant Ecotec Plus 837 VUW 376/3-5 R1 2006-2011
Vaillant Ecotec Plus 837 VUW 376/3-5 R3 2011-2012
Vaillant Ecotec Plus 837 VUW 376/5-5 2012-2012
Vaillant Ecotec Plus 837 VUW 376/5-5 R1 2012-2013
Vaillant Ecotec Plus 837 VUW 376/5-5 R2 2013-2014
Vaillant Ecotec Plus 837 VUW 376/5-5 R4 2014-2015
Vaillant Ecotec Plus 838 VUW 286/5-5 R6 2017 Onwards
Vaillant Ecotec Plus 838 VUW 386/5-5 R4 2015 Onwards
Vaillant Ecotec Plus 937 VUI 376/3-5 2006-2012
Vaillant Ecotec Plus 937 VUI 376/5-5 2012-2012
Vaillant Ecotec Plus 937 VUI 376/5-5 R1 2012-2013
Vaillant Ecotec Plus 937 VUI 376/5-5 R2 2013-2014
Vaillant Ecotec Plus 937 VUI 376/5-5 R4 2014-2015
Vaillant Ecotec Plus 938 VUI 286/5-5 R6 2017 Onwards
Vaillant Ecotec Plus 938 VUI 386/5-5 R4 2015 Onwards
Vaillant Ecotec Pro 22 VU 226/5-3 A R4 (For Guernsey/Jersey Only) Current Production
Vaillant Ecotec Pro 22 VU 226/5-3 R4 (For Guernsey/Jersey Only)
Vaillant Ecotec Pro 24 VUW 246/3-3 R1 2006-2008
Vaillant Ecotec Pro 24 VUW 246/3-3 R2 2008-2012
Vaillant Ecotec Pro 24 VUW 246/5-3 R4 (2015-2017)
Vaillant Ecotec Pro 24 VUW 246/5-3 R4 2015-2015
Vaillant Ecotec Pro 24 VUW 246/5-3 R6 2017 Onwards
Vaillant Ecotec Pro 28 VUW 286/3-3 R1 2005-2008
Vaillant Ecotec Pro 28 VUW 286/3-3 R2 2008-2012
Vaillant Ecotec Pro 28 VUW 286/5-3 R4 2015 - 2017
Vaillant Ecotec Pro 28 VUW 286/5-3 R4 2015 - 2017 LPG
Vaillant Ecotec Pro 28 VUW 286/5-3 R4 2015-2015 LPG
Vaillant Ecotec Pro 28 VUW 286/5-3 R4 2015-2015 NG
Vaillant Ecotec Pro 28 VUW 286/5-3 R6 2017 Onwards
Vaillant Ecotec Pro 28 VUW 286/5-3 R6 LPG 2017 Onwards
Vaillant Exclusive 627 VU 256/5-7
Vaillant VWZ MEH 61 2013 Onwards
Vaillant Home Combi 25 -A
Vaillant Home Combi 30 -A
Vaillant Home Combi 35 -A
Vaillant Home System 12 -A
Vaillant Home System 15 -A
Vaillant Home System 18 -A
Vaillant Home System 25 -A
Ideal Evomax 2 30kw LPG
41-044-20
41-044-27
41-044-21
41-044-28
41-044-22
41-044-29
41-044-43
20-062-00
47-044-12
47-044-07
47-044-17
47-044-08
47-044-27
47-044-37
47-044-66
47-044-38
47-044-67
41-044-44
41-044-44 R1
41-044-60
41-044-78
41-694-20 R6 (0010021828)
41-044-60 R1
41-044-60 R2
41-044-60 R4
ECOTEC PLUS 612, 615, 618, 624, 630, 637
41-044-45
41-044-45 R1
41-044-61
41-044-79
41-694-21 R6 (0010021829)
41-044-61 R1
41-044-61 R2
41-044-61 R4
41-044-46
41-044-46 R1
41-044-66
41-044-62
41-044-81
41-044-80
41-694-23 R6 (0010021831)
41-694-22 R6 (0010021830)
41-044-66 R1
41-044-62 R1
41-044-66 R2
41-044-62 R2
41-044-66 R4
41-044-62 R4
41-044-47
41-044-47 R1
41-044-63
41-044-82
41-694-24 R6 (0010021832)
41-044-63 R1
41-044-63 R2
41-044-63 R4
41-044-48
41-044-48 R1
41-044-67
41-044-64
41-044-84
41-044-83
41-694-26 R6 (0010021834)
41-694-25 R6 (0010021833)
41-044-67 R1
41-044-64 R1
41-044-67 R2
41-044-64 R2
41-044-67 R4
41-044-64 R4
41-044-52
41-044-65
41-044-85
41-044-65 R1
41-044-65 R2
41-044-65 R4
41-694-27 R6 (0010021835)
47-044-31
47-044-31 R1
47-044-31 R2
47-044-40
47-044-40 R1
47-044-40 R2
47-044-40 R4
47-044-83 R6 (0010021823)
47-044-57
47-044-32
47-044-32 R1
47-044-32 R3
47-044-32 R5
47-044-46
47-044-41
47-044-46 R1
47-044-41 R1
47-044-46 R2
47-044-41 R2
47-044-46 R4
47-044-41 R4
47-044-85 R6 (0010021825)
47-044-84 R6 (0010021824)
47-044-58
47-044-82 R6 (0010021822)
47-044-53
47-044-33 R1
47-044-33 R3
47-044-42
47-044-42 R1
47-044-42 R2
47-044-42 R4
47-044-86 R6 (0010021826)
47-044-60
47-044-39
47-044-43
47-044-43 R1
47-044-43 R2
47-044-43 R4
47-044-87 R6 (0010021827)
47-044-61 R4
10018497
10015190
47-044-36 R1
47-044-36 R2
47-044-54
47-044-44 R4
47-044-88 (0010021836)
47-044-30 R1
47-044-30 R2
47-044-55 (0010018495)
47-044-56 (0010018496)
47-044-47 R4
47-044-45 R4
47-044-89 (0010021837)
47-044-90 (0010021838)
41-694-02
20143590
47-044-62
47-044-63
47-044-64
41-044-94
41-044-95
41-044-96
41-044-97
41-796-33
Delivery
Free next day UK delivery is available on orders over £50.
Orders placed before 3 PM are usually dispatched the same working day.
Delivery times may vary for remote areas, Highlands, islands, and non-mainland UK destinations.
If you need urgent delivery help, please contact our customer service team before placing your order.
All Orders First 30 Days:
You can return or cancel your orders for any reason at any time within 30 days of receipt. After 30 days, we reserve the right to charge a restocking fee or refuse the return.
Parts must be returned in the same condition and packaging as received, or we may deduct a percentage of the cost of the part.
A full refund or exchange will be agreed once the item(s) have been received and inspected to ensure they are unused and in their original packaging where applicable.
If the part is returned as faulty and is found to be working upon inspection, postage costs will be deducted from the refund.
Faulty Items After 30 Days:
All items come with a 1 year HTS warranty from the date of purchase. Warranty means HTS will repair or replace the item.
Refunds:
Our returns team will process your refund after we receive and check your items. Please allow up to 15 days for your refund to be processed.
The refund will be made to the original payment method used to place the order.
Contact Us:
For any queries, email us at returns@heatingtradesupplies.com or call +44 01912633708.
Customer Services
National Boiler Spares Ltd
Tyne View Terrace
Wallsend
Tyne and Wear
NE28 6SG
