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ecoTEC plus 412, 415, 418, 424, 430 and 435

ecoTEC plus open vent boiler range

  • Rear flue option
  • Compact dimensions
  • Large backlit plain text display
  • Removable side panels
  • 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

Extremely reliable and displaying all the in-built quality you’ve come to expect from Vaillant, the ecoTEC plus is clearly one of the best open vent solutions available today – Where homes utilize a traditional open-vented system to provide their heating and hot water, the ecoTEC plus open vent boiler is the ideal way to deliver exceptional energy efficient performance.

Available in six different outputs 12, 15, 18, 24, 30 and 35kW – ecoTEC plus open vent boilers are the most compact boilers ever developed by Vaillant. This kitchen-friendly design, along with excellent siting versatility and low lift weight ensure a quick and straightforward installation.

Features and benefits

  • Highly efficient and economical to run – With up to an 89.2% efficiency rating (SAP 2009)
  • Compact and light weight – (600mm x 375mm x 340mm) Small footprint for excellent siting, flexibility and ease of installation including possibility of fitting into a kitchen cupboard
  • Push button programming – Makes usage straight forward and easy to use
  • Built-in-two-stage frost protection – To ensure optimal performance all year round
  • Push fit flue system – For greater installation flexibility
  • Compatible with all Vaillant controls - Flexible controls options which offer energy efficient solutions and the possibility of smart phone control, giving a total system solution, all available from one manufacturer
  • Wide modulation range of up to 1:6 – Ensuring low energy consumption and maximum efficiency
  • Rear flue option - Provides flexibility enabling installation of the boiler in virtually any situation
  • Large backlit plain text display - Delivers clear visibility in poor light conditions and easy reading of current boiler operation and status
  • Removable side panels - For increased accessibility during installation, routine maintenance and repair work
  • Impressive 5 year guarantee which is extended to 7 years for all Vaillant Advance Installers - For total peace of mind



Technical dataUnit of measureecoTEC plus 412ecoTEC plus 415ecoTEC plus 418ecoTEC plus 424ecoTEC plus 424 LPGecoTEC plus 430ecoTEC plus 435
Boiler type open ventopen ventopen ventopen ventopen ventopen ventopen vent
Signature model output 12kW15kW18kW24kW24kW30kW35kW
Article number  0010021220001002122100100212220010021223002023135500100212240010015674
Gas Council number 






Boiler dimensions (HxWxD)mm
602 x 375 x 320

602 x 375 x 320

602 x 375 x 320

602 x 375 x 320

602 x 375 x 320

602 x 375 x 320

602 x 375 x 320
Nominal heat output range at 50/30˚C (Condensing mode)kW4.7 - 12.84.7 - 15.95.2 - 19.16.3 - 25.78 - 25.77.5 - 31.87.5 - 37.1
Nominal heat output range at 80/60˚C (Non condensing mode)kwW4.5 - 12.34.5 - 15.25 - 18.36.1 - 24.67.6 - 24.37.2 - 30.57.1 - 35.1
Maximum flow temperature˚C80808080808080
Flow temperature range˚C10 - 8010 - 8010 - 8010 - 8010 - 8010 - 8010 - 80
Flow temperature factory setting˚C75757575757575
Approximate condensate volume at 50/30˚Clitres/hr1.231.531.842.472.473.063.57
Modulation (max/min)1 : X1:41:41:51:4.91:3.91:4.91:4.9
Domestic Hot Water
Maximum heat output for water generationkW181825.230303535.1
Lowest water pressure to operate boilerbar-------
Lowest water flow for operationl/min-------
Lowest water pressure for maximum flow ratebar-------
Domestic hot water flow rate (at DT = Δ35K) *l/min-------
Hot water output temperature range˚C-------
NOx class 6666666
NOx (En 15502-2-1)mg/kWh32333939354032
ErP efficiency%94949494949494
ErP decibel rating (sound power)dBa45485152495553
Fluing options
Maximum horizontal flue length 60/100m101010100.71010
Maximum vertial flue lengthm10101010-1010
Maximum horizontal flue length 80/125m25252525-2525
Maximum vertical flue length 80/125m25252525-2525

*flow restrictor fitted to achieve a Δ42K rise

Related Products

Related Products

Domestic boiler cylinders

  • Slim line, pre plumbed and standard cylinders in the range
  • 2 year guarantee on parts and labour plus 25 year guarantee for the cylinder shell, giving you total peace of mind.
  • Can be retrofitted onto older systems meaning you can upgrade your cylinder without the hassle of the entire system.
  • Improved insulation meaning heat loss is minimised and lower running costs
  • Adjustable feet meaning the cylinder can be installed on uneven ground.

timeSWITCH 160

  • Compatible with all Vaillant system and heat only appliances
  • Two channel digital timer
  • Mounts directly into boiler fascia
  • Controls heating and domestic hot water timed programmes
  • Holiday function


Alternative products

Alternative products

ecoFIT pure open vent boiler

  • Compact, cupboard fit solution
  • Top and rear flue options
  • Automotive grade aluminium heat exchanger
  • Easy installation and maintenance
  • Standard 2 year warranty. Free 7 year warranty when registered by a Vaillant Advance partner (promotion until 31/12/18)