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ecoTEC plus 825, 832, 835, 838 and 938

ecoTEC plus combination boilers

  • Step by step full text installation wizard
  • Dedicated models available for LPG
  • ErP 'A' rated
  • 5-year guarantee as standard, with 7 years available when you book a Vaillant Advance installer or 10 years when fitted with a Boiler Protection Kit by a Vaillant Advance installer*


*10 year guarantee only available on boilers with an output of up to 45kWs

The ecoTEC plus range of high efficiency boilers combine fantastic efficiency levels and high performance with great usability. Thanks to continuous modulation and real combustion control by a multi-sensor system, they achieve high efficiency at the lowest emissions.

ecoTEC plus 938

The ecoTEC plus 938 is a 38kW high efficiency storage combination boiler which has been

designed especially for larger homes which have a higher hot water demand. The ecoTEC plus 938

also features an innovative integrated hot water storage device at the back of the boiler. This special

feature means the product is capable of delivering up to 20 litres of hot water per minute.

Features and benefits:

  • Available in 25, 32, 35 and 38kW outputs
  • Highly efficient and economical to run – With up to an 89.4% efficiency rating (SAP 2009)
  • Instant hot water delivery in just 5 seconds - Meaning no need for storage tank or cylinder
  • Wide modulation range of up to 1:6 – Ensuring low energy consumption and maximum efficiency
  • Flame lift detection system – Enabling more efficient and quieter combustion
  • Dedicated models available for LPG – Giving a solution for off-gas areas
  • Stylish contoured case design with down flap – Making this a boiler that fits with the décor of any home
  • Built-in-two-stage frost protection – Ensuring optimal performance all year round
  • An innovative solution for large homes – With a higher hot water demand, without needing to install a cylinder or hot water tank (ecoTEC plus 937 only)
  • Extended guarantees available when installed by a Vaillant Advance partner – For total peace of mind
  • Quiet Mark accreditation – Thanks to being ultra quiet whilst in operation
  • Step by step wizard – For quicker ‘first time right’ set up and installation
  • Compatible with aroTHERM air to water heat pump hybrid system – Making the perfect entry into renewable systems
  • Standard 5 year warranty, can be upgraded to a free 7 year warranty when registered through Vaillant Advance
  • Option to purchase extended warranty up to 10 years when registered through Vaillant Advance

Download your ErP label here

ecoTEC plus 825 ErP label (82 kB)

ecoTEC plus 832 ErP label (81 kB)

ecoTEC plus 832 LPG ErP label (81 kB)

ecoTEC plus 835 ErP label (84 kB)

ecoTEC plus 838 ErP (82 kB)

ecoTEC plus 938 ErP label (82 kB)



Technical dataUnit ecoTEC plus 825ecoTEC plus 832 ecoTEC plus 832 LPGecoTEC plus 835ecoTEC plus 838ecoTEC plus 938
Boiler type combicombicombicombicombicombi
Signature model output 25kW32kW32kW35kW38kW38kW

Article number
001002183230010021824 0010021825001002182200100218260010021827

Gas Council number
Boiler dimensions (HxWxD)mm720 x 440 x 338720 x 440 x 338720 x 440 x 338720 x 440 x 372720 x 440 x 406720 x 440 x 600
Nominal heat output range at 50/30˚C (Condensing mode)kW4.2 - 20.45.7 - 25.76.7 - 25.76.4 - 32.27.1 - 30.17.1 - 30.1
Nominal heat output range at 80/60˚C (Non condensing mode)kW3.8 - 19.35.2 - 24.46 - 24.45.8 - 30.46.5 - 28.66.4 - 28.6
Maximum flow temperature˚C858585858585
Flow temperature range˚C30 - 8530 - 8530 - 8530 - 8530 - 8530 - 85
Flow temperature factory setting˚C757575757575
Approximate condensate volume at 50/30˚Clitres/hr22.
Modulation (max/min)1 : X1:6.71:6.11:5.31:61:61:6
Domestic Hot Water
Maximum heat output for water generationkW25.431.831.83538.738.7
Lowest water pressure to operate boilerbar0.350.350.350.350.350.35
Lowest water flow for operationl/min2.
Lowest water pressure for maximum flow ratebar0.
Domestic hot water flow rate (at DT = Δ35K) *l/min10.5131314.315.915.9
Hot water output temperature range˚C35 - 6535 - 6535 - 6535 - 6535 - 6535 - 65
Expansion vessel sizelitres101010101010
Gas inlet connection (pipe size)mm151515151515
Heating flow and return connections (pipe size)mm222222222222
Hot and cold water connections (pipe size)mm151515151515
Heat exchanger materialStainless/AluminiumStainless steelStainless steelStainless steelStainless steelStainless steelStainless steel
Boiler lift weight (Dry boiler)kg363737384360 (43+17)
NOx class 555555
NOx (En 15502-2-1)mg/kWh323555342934
ErP efficiency%949494949494
ErPdecibel rating (sound power)dBa474747454645
Fluing options
Maximum horizontal flue length 60/100m125.
Maximum vertical flue length 60/100m168-888
Maximum horizontal flue length 80/125m3932-323232
Maximum vertical flue length 80/125m4134-343434


Alternative products

Alternative products

aroTHERM hybrid air source heat pump

  • The perfect entry into renewable systems
  • Four models in the range 5kW, 8kW, 11kW and 15kW
  • Unique triVAI® intelligent control system
  • Compatible with all boiler systems Gas, oil and LPG
  • Total system solution Available in an easy to order pack