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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
  • Easy installation and maintenance
  • Standard 2 year warranty. Free 7 year warranty when registered by a Vaillant Advance partner (promotion until 31/12/18)


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 Vaillant. 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 (Quiet Mark approved), 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 specification, 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 in 12, 15, 18, 25, 30 and 35kW outputs
  • 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 free 7 year warranty when registered through Vaillant Advance. For homeowner piece of mind
  • Option to purchase extended warranty up to 10 years when registered through Vaillant Advance



ecoFIT pure open vent boilers
Technical dataUnit12kW15kW18kW25kW30kW35kW
Article number 001002040000100204010010020402001002040300100204040010020405
Boiler dimensions (HxWxD)mm600 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 option YesYesYesYesYesYes
Boiler lift weightkg222222232323
Nominal heat output range at 50/30˚C kW4.7 - 12.84.7 - 15.95.2 - 19.16.4 - 26.57.5 - 31.87.5 - 37.1
Nominal heat output range at 80/60˚CkW4.5 - 12.24.5 - 15.15.0 - 18.2 6.0 - 25.27.1 - 30.37.1 - 35.1
Maximum flow temperature°C808080808080
Flow temperature range°C10 - 8010 - 8010 - 8010 - 8010 - 8010 - 80
Flow temperature factory setting°C757575757575
Approximate condensate volume at 50/30¢ªCl/hr1.231.551.842.553.063.57
Maximum horizontal flue length 60/100m101010101010
PCDB seasonal efficiency%89.389.1898989.387.9
ErP rating (heating/hot water) AAAAAA

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