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Homepage > Boilers > Shop By Boiler Manufacturer > Vaillant Boilers > Vaillant Condensing Combi Gas Boilers > Vaillant ecoTEC Plus 831 Condensing Combi Gas Boiler

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Vaillant ecoTEC Plus 831 Condensing Combi Gas Boiler
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Vaillant ecoTEC Plus 831 Condensing Combi Gas Boiler 308521


Delivery: 4 Working Days (Approx)

Manufacturer GuaranteeSedbuk A Rated BoilerNatural Gas BoilerThis Product is In Stock
Ref: 127085

RRP: £1822.50
Our Price: £1035.47
Saving: £787.03
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Please Click Yellow Tabs Below for Further Product Details
Code Description Inc. VAT Excl. VAT
127085 - Vaillant 831 EcoTEC Gas Boiler £1,035.47 £862.89


100mm Diameter Flue Accessories
Vaillant Eco Standard Horiz Flue Duct

£98.62 (£82.18 exc. VAT)
Vaillant Eco Horiz Flue Kit Telescopic

£109.56 (£91.30 exc. VAT)
Vaillant Vertical Flue Terminal 60/100

£120.82 (£100.68 exc. VAT)
Vaillant Ecomax Ii 90 Degree Elbow

£44.23 (£36.86 exc. VAT)
Vaillant Ecomax Ii 45 Degree Bends (Pair)

£74.64 (£62.20 exc. VAT)
Vaillant Ecomax Ii 470mm Flue Extension Kit

£39.73 (£33.11 exc. VAT)
Vaillant Ecomax Ii 970mm Flue Extension Kit

£52.12 (£43.43 exc. VAT)
Vaillant Ecomax Ii 1970mm Flue Extension Kit

£89.28 (£74.40 exc. VAT)
Vaillant Ecomax Ii Telescopic Duct Extension

£61.13 (£50.94 exc. VAT)
Vaillant Ecomax Ii Telescopic Offset

£83.65 (£69.71 exc. VAT)
Vaillant Ecomax Ii Sliding Sleeve

£47.42 (£39.52 exc. VAT)
Vaillant Flue Support Clips (5)

£39.73 (£33.11 exc. VAT)
Vaillant Eco Adj Flue Clip (3)

£46.49 (£38.74 exc. VAT)
Vaillant Eco Black Term Kit For StandarDegree Flue

£32.96 (£27.47 exc. VAT)


125mm Diameter Flue Accessories
Vaillant Ecomax 1 Meter Standard Degree Flue Kit 125mm

£115.75 (£96.46 exc. VAT)
Vaillant Eco 125mm Flue Adapter

£45.36 (£37.80 exc. VAT)
Vaillant Ecomax Vertical Air/Flue Duct 125mm

£152.35 (£126.96 exc. VAT)
Vaillant 87 Degree Elbow 125mm Hgh Efficient

£58.87 (£49.06 exc. VAT)
Vaillant Ecomax 45 Degree Bends (Pair) 125mm

£102.79 (£85.66 exc. VAT)
Vaillant Ecomax 470mm Flue Extension Kit 125mm

£39.73 (£33.11 exc. VAT)
Vaillant Ecomax 970mm Flue Extension Kit 125mm

£60.00 (£50.00 exc. VAT)
Vaillant Ecomax 1970mm Flue Ex Kit 125mm

£108.43 (£90.36 exc. VAT)
Vaillant Ecomax Sliding Sleeve 125mm

£44.23 (£36.86 exc. VAT)


Variable Termination Kits
Vaillant Eco Vari Term Basic Set Black

£73.51 (£61.26 exc. VAT)
Vaillant Eco Vari Term Basic Set White

£73.51 (£61.26 exc. VAT)


Programmers And Timers
Vaillant VRT360F Wireless Progammer Room Thermostat

£153.48 (£127.90 exc. VAT)
Vaillant VRC400 WeatHEr Compensator

£136.58 (£113.82 exc. VAT)
Vaillant Switch 130 Analogue Time Clock

£53.24 (£44.37 exc. VAT)
Vaillant Ecotec Switch 140 2Channel Progammer

£75.77 (£63.14 exc. VAT)


Flashing Kits
Seldek Flat / Pitched Aluminium Roof Flashing Kit No.1

£21.40 (£17.83 exc. VAT)


Condensate Removal Pumps
Grundfos Conlift Condensate Removal Pump

£185.62 (£154.68 exc. VAT)


High Temperature Silicone


Smoke Alarms & Carbon Monoxide Alarms
Self Contained Carbon Monoxide Alarm

£22.33 (£18.61 exc. VAT)
Mains Operated Carbon Monoxide Alarm with battery backup

£60.00 (£50.00 exc. VAT)
Vaillant Eco Standard Horiz Flue Duct

£98.62 (£82.18 exc. VAT)
Vaillant Eco Horiz Flue Kit Telescopic

£109.56 (£91.30 exc. VAT)
Vaillant Vertical Flue Terminal 60/100

£120.82 (£100.68 exc. VAT)
Vaillant Ecomax Ii 90 Degree Elbow

£44.23 (£36.86 exc. VAT)
Vaillant Ecomax Ii 45 Degree Bends (Pair)

£74.64 (£62.20 exc. VAT)
Vaillant Ecomax Ii 470mm Flue Extension Kit

£39.73 (£33.11 exc. VAT)
Vaillant Ecomax Ii 970mm Flue Extension Kit

£52.12 (£43.43 exc. VAT)
Vaillant Ecomax Ii 1970mm Flue Extension Kit

£89.28 (£74.40 exc. VAT)
Vaillant Ecomax Ii Telescopic Duct Extension

£61.13 (£50.94 exc. VAT)
Vaillant Ecomax Ii Telescopic Offset

£83.65 (£69.71 exc. VAT)
Vaillant Ecomax Ii Sliding Sleeve

£47.42 (£39.52 exc. VAT)
Vaillant Flue Support Clips (5)

£39.73 (£33.11 exc. VAT)
Vaillant Eco Adj Flue Clip (3)

£46.49 (£38.74 exc. VAT)
Vaillant Eco Black Term Kit For StandarDegree Flue

£32.96 (£27.47 exc. VAT)
Vaillant Ecomax 1 Meter Standard Degree Flue Kit 125mm

£115.75 (£96.46 exc. VAT)
Vaillant Eco 125mm Flue Adapter

£45.36 (£37.80 exc. VAT)
Vaillant Ecomax Vertical Air/Flue Duct 125mm

£152.35 (£126.96 exc. VAT)
Vaillant 87 Degree Elbow 125mm Hgh Efficient

£58.87 (£49.06 exc. VAT)
Vaillant Ecomax 45 Degree Bends (Pair) 125mm

£102.79 (£85.66 exc. VAT)
Vaillant Ecomax 470mm Flue Extension Kit 125mm

£39.73 (£33.11 exc. VAT)
Vaillant Ecomax 970mm Flue Extension Kit 125mm

£60.00 (£50.00 exc. VAT)
Vaillant Ecomax 1970mm Flue Ex Kit 125mm

£108.43 (£90.36 exc. VAT)
Vaillant Ecomax Sliding Sleeve 125mm

£44.23 (£36.86 exc. VAT)
Vaillant Eco Vari Term Basic Set Black

£73.51 (£61.26 exc. VAT)
Vaillant Eco Vari Term Basic Set White

£73.51 (£61.26 exc. VAT)
Vaillant VRT360F Wireless Progammer Room Thermostat

£153.48 (£127.90 exc. VAT)
Vaillant VRC400 WeatHEr Compensator

£136.58 (£113.82 exc. VAT)
Vaillant Switch 130 Analogue Time Clock

£53.24 (£44.37 exc. VAT)
Vaillant Ecotec Switch 140 2Channel Progammer

£75.77 (£63.14 exc. VAT)
Seldek Flat / Pitched Aluminium Roof Flashing Kit No.1

£21.40 (£17.83 exc. VAT)
Grundfos Conlift Condensate Removal Pump

£185.62 (£154.68 exc. VAT)
Self Contained Carbon Monoxide Alarm

£22.33 (£18.61 exc. VAT)
Mains Operated Carbon Monoxide Alarm with battery backup

£60.00 (£50.00 exc. VAT)


The ecoTEC Plus 831 Combi Gas Boiler is part of the ecoTEC Plus range of high-efficiency combination gas boilers from Vaillant. This SEDBUK A Rated boiler comes with a 2 year warranty and offers generous heating outputs whilst saving costs on your heating bills.

Vaillant ecoTEC Plus 831 Features and Benefits:

  • Excellent hot water performance due to Vaillant's Aquacomfort system
  • Stainless Steel Heat Exchanger with large surface area to maximise heat transfer
  • Compatible with Vaillant range of high-efficiency flues
  • Single electronic circuit board for simple commissioning
  • ecoLEVEL Condensate Pump compatible
  • Comprehensive status and diagnostic information available
  • Simple push-button programming
  • Two stage frost protection
  • Filling Loop Included

Vaillant ecoTEC Plus 831 Boiler Specifications


Height (mm) 720
Width (mm) 440
Depth (mm) 335
Maximum Domestic Hot Water Output (kW) 31.0
Maximum Domestic Hot Water Output (btu) 105,800
Central Heating Output (kW) 8.7 - 24.0
Central Heating Output (btu) 29,702 - 81,936
Flow Rate (l/min) 12.7
SEDBUK Band A


With this boiler, for a standard installation, you will require a standard horizontal flue kit and timeSWITCH 130 Plug In Timer. We have pre-checked these for you for your ease of ordering. Untick if not required and make the selection that you need.



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Vaillant ecoTEC Plus 831 Condensing Combi Gas Boiler


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