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ecoFIT pure open vent boiler

412, 415, 418, 425, 430 and 435 outputs

  • Compact, cupboard fit solution
  • Top and rear flue options
  • Automotive grade aluminium heat exchanger
  • 2 year warranty available with options up to 7 years when registered by an Advance installer


Introducing the boiler that opens more doors: The new ecoFIT pure

As one of Europe’s leading heating technology manufacturers, ‘thinking ahead’ is a culture which is embraced throughout our business. Our products feature high energy efficiency ratings and low emissions, and come with an enviable reputation for performance, quality and reliability. This comes from proven German engineering combined with award winning UK manufacturing.

Ultra-quiet operation, small footprint and total flexibility of siting (with top and rear flue options) mean that the ecoFIT pure range fits in with your customers’ needs. The automatic purging assistance and high spec, aluminium heat exchanger makes for a lightweight installation.High quality and high efficiency, together with the complete availability of spare parts and the easy accessibility of the unit layout mean the ecoFIT pure is easy to maintain too.

Features & benefits:

  • Available open vent outputs: 12kW, 15kW, 18kW, 25kW, 30kW and 35kW
  • Top and rear flue options on all boiler models - Allows flexible siting options and installs in various property types
  • Compact, cupboard fit solution - small boiler footprint, offering flexibility of siting, including a cupboard-fit
  • Clear LED display - offers visibility in dimly lit areas for easier installation and use
  • Easy installation and maintenance - accessible layout that allows all components to be replaced from the boiler front
  • Recognisable Vaillant fault codes - making it easy to diagnose faults
  • High-specification aluminium heat exchanger- designed to last longer, maintain easily, and reduce energy bills
  • High-quality components - offering peace of mind for the lifetime of the product
  • Industry-leading flue lengths - 10m flue length across all ecoFIT pure boiler outputs
  • 4-sided cooling and water agitation of the heat exchanger - reducing stress on the heat exchanger for longer life reliability and reduced maintenance costs
  • Compatible with Vaillant’s intelligent range of controls - for the most convenient and energy efficient system, saving on energy bills
  • Standard 2 year warranty, can be upgraded to a 7 year warranty when installed by a Vaillant Advance installer
  • Option to purchase extended warranty up to 10 years when registered by an Advance installer



ecoFIT pure open vent boilers
Technical data12kW open vent15kW open vent18kW open vent25kW open vent30kW open vent35kW open vent
Article Number001002040000100204010010020402001002040300100204040010020405
Boiler dimensions (HxWxD) (mm)600 x 375 x 295600 x 375 x 295600 x 375 x 295600 x 375 x 295600 x 375 x 295600 x 375 x 295
Rear flue optionYesYesYesYesYesYes
Boiler lift weight (kg)222222232323
Nominal heat output range at 50/30˚C (kW)4.7 - 12.84.7 - 15.95.2 - 19.16.4 - 26.57.5 - 31.87.5 - 37.1
Nominal heat output range at 80/60˚C (kW)4.5 - 12.24.5 - 15.15.0 - 18.2 6.0 - 25.27.1 - 30.37.1 - 35.1
Maximum flow temperature (˚C)808080808080
Flow temperature range (˚C)10-8010-8010-8010-8010-8010-80
Flow temperature factory setting (˚C)757575757575
Approximate condensate volume at 50/30¢ªC (l/hr)1.231.551.842.553.063.57
Maximum horizontal flue length 60/100 (m)101010101010
PCDB seasonal efficiency (%)89.389.1898989.387.9
ErP rating (heating/hot water)AAAAAA

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