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  • Vaillant ecoTEC Plus 831 Condensing Combi LPG Boiler
  • Vaillant ecoTEC Plus 831 Condensing Combi LPG Boiler
  • Vaillant ecoTEC Plus 831 Condensing Combi LPG Boiler
  • Vaillant ecoTEC Plus 831 Condensing Combi LPG Boiler

Vaillant ecoTEC Plus 831 Condensing Combi LPG Boiler

Reference: PETECPLUS831P
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The ecoTEC Plus 831 Combi LPG 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.

100mm Diameter Flue Accessories
  • Vaillant Eco Standard Horiz Flue Duct

    Vaillant Eco Standard Horiz Flue Duct(PECOSTD)

    £109.28 (£91.07 exc. VAT)
  • Vaillant Eco Horiz Flue Kit Telescopic

    Vaillant Eco Horiz Flue Kit Telescopic(PVA303936)

    £130.43 (£108.69 exc. VAT)
  • Vaillant Vertical Flue Terminal 60/100

    Vaillant Vertical Flue Terminal 60/100(PVA20065937)

    £142.18 (£118.48 exc. VAT)
  • Vaillant Ecomax Ii 90 Degree Elbow

    Vaillant Ecomax Ii 90 Degree Elbow(PVA303910)

    £52.88 (£44.06 exc. VAT)
  • Vaillant Ecomax Ii 45 Degree Bends (Pair)

    Vaillant Ecomax Ii 45 Degree Bends (Pair)(PVA303911)

    £88.13 (£73.44 exc. VAT)
  • Vaillant Ecomax Ii 470mm Flue Extension Kit

    Vaillant Ecomax Ii 470mm Flue Extension Kit(PVA303902)

    £43.48 (£36.23 exc. VAT)
  • Vaillant Ecomax Ii 970mm Flue Extension Kit

    Vaillant Ecomax Ii 970mm Flue Extension Kit(PVA303903)

    £59.93 (£49.94 exc. VAT)
  • Vaillant Ecomax Ii 1970mm Flue Extension Kit

    Vaillant Ecomax Ii 1970mm Flue Extension Kit(PVA303905)

    £105.75 (£88.13 exc. VAT)
  • Vaillant Ecomax Ii Telescopic Duct Extension

    Vaillant Ecomax Ii Telescopic Duct Extension(PVA303906)

    £72.85 (£60.71 exc. VAT)
  • Vaillant Ecomax Ii Telescopic Offset

    Vaillant Ecomax Ii Telescopic Offset(PVA303919)

    £97.53 (£81.27 exc. VAT)
  • Vaillant Ecomax Ii Sliding Sleeve

    Vaillant Ecomax Ii Sliding Sleeve(PVA303915)

    £49.35 (£41.13 exc. VAT)
  • Vaillant Flue Support Clips (5)

    Vaillant Flue Support Clips (5)(PVA303821)

    £41.13 (£34.27 exc. VAT)
  • Vaillant Eco Adj Flue Clip (3)

    Vaillant Eco Adj Flue Clip (3)(PVA303935)

    £55.23 (£46.02 exc. VAT)
  • Vaillant Eco Black Term Kit For StandarDegree Flue

    Vaillant Eco Black Term Kit For StandarDegree Flue(PVA303934)

    £34.08 (£28.40 exc. VAT)
125mm Diameter Flue Accessories
  • Vaillant Ecomax 1 Meter Standard Degree Flue Kit 125mm

    Vaillant Ecomax 1 Meter Standard Degree Flue Kit 125mm(PVA303209)

    £126.90 (£105.75 exc. VAT)
  • Vaillant Eco 125mm Flue Adapter

    Vaillant Eco 125mm Flue Adapter(PVA303926)

    £52.88 (£44.06 exc. VAT)
  • Vaillant Ecomax Vertical Air/Flue Duct 125mm

    Vaillant Ecomax Vertical Air/Flue Duct 125mm(PVA303200)

    £180.96 (£150.80 exc. VAT)
  • Vaillant 87 Degree Elbow 125mm Hgh Efficient

    Vaillant 87 Degree Elbow 125mm Hgh Efficient(PVA303210)

    £55.81 (£46.51 exc. VAT)
  • Vaillant Ecomax 45 Degree Bends (Pair) 125mm

    Vaillant Ecomax 45 Degree Bends (Pair) 125mm(PVA303211)

    £122.20 (£101.84 exc. VAT)
  • Vaillant Ecomax 470mm Flue Extension Kit 125mm

    Vaillant Ecomax 470mm Flue Extension Kit 125mm(PVA303202)

    £45.83 (£38.19 exc. VAT)
  • Vaillant Ecomax 970mm Flue Extension Kit 125mm

    Vaillant Ecomax 970mm Flue Extension Kit 125mm(PVA303203)

    £72.85 (£60.71 exc. VAT)
  • Vaillant Ecomax 1970mm Flue Ex Kit 125mm

    Vaillant Ecomax 1970mm Flue Ex Kit 125mm(PVA303205)

    £129.25 (£107.71 exc. VAT)
  • Vaillant Ecomax Sliding Sleeve 125mm

    Vaillant Ecomax Sliding Sleeve 125mm(PVA303215)

    £49.35 (£41.13 exc. VAT)
Variable Termination Kits
  • Vaillant Eco Vari Term Basic Set Black

    Vaillant Eco Vari Term Basic Set Black(PVA303942)

    £85.78 (£71.48 exc. VAT)
  • Vaillant Eco Vari Term Basic Set White

    Vaillant Eco Vari Term Basic Set White(PVA303946)

    £85.78 (£71.48 exc. VAT)
Programmers And Timers
  • Vaillant VRT360F Wireless Progammer Room Thermostat

    Vaillant VRT360F Wireless Progammer Room Thermostat(127959)

    £160.98 (£134.15 exc. VAT)
  • Vaillant VRC400 WeatHEr Compensator

    Vaillant VRC400 WeatHEr Compensator(127892)

    £154.71 (£128.93 exc. VAT)
  • Vaillant Ecotec Switch 140 2Channel Progammer

    Vaillant Ecotec Switch 140 2Channel Progammer(PVA306760)

    £83.43 (£69.52 exc. VAT)
Flashing Kits
High Temperature Silicone
Smoke Alarms & Carbon Monoxide Alarms
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