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Passive flue gas heat recovery device

  • A simple and cost effective product to provide improved efficiency
  • Easy to install
  • Helps to meet the requirements of higher levels of the code for sustainable homes
  • Improves the efficiency of hot water production
  • Can easily be linked to weather compensation control technology


You can be sure that when it comes to creating the ideal environment. Vaillant has it all under control. Vaillant’s ecoTEC product range offers exceptionally high efficiency and is also highly economical in operation. Now, our Passive Flue Gas Heat Recovery Device, recoFLUE, can be used with our ecoTEC pro and plus domestic combination boiler ranges* to create an even more efficient cost-effective system.

*compatible with ecoTEC pro 24 pro 28 LPG, ecoTEC plus 824, plus 831, plus 831 LPG, plus 837

Alternative products

Alternative products

ecoTEC plus 825, 832, 838 and 938

ecoTEC plus combination boilers

  • Wide modulation range of up to 1:6
  • Built-in-Two-Stage frost protection
  • Step by Step full text installation wizard
  • Dedicated models available for LPG

ecoTEC pro 24, 28 and 30kW

Combination boiler range

  • Removable side panels and push-fit flue system
  • Fully modulating low NOx burner and fan
  • Increased speed of hot water delivery
  • Dedicated models available for LPG