Boilers: Compare features & prices Vaillant ecoTEC plus 637 review

The Vaillant EcoTEC plus 637 is the most powerful system boiler version in the range. It is a condensing gas boilers that uses a separate cylinder (usually fitted into an airing cupboard) to store the hot water supply. Often called 'sealed system boilers' Vaillant claims they are lightweight and easy to install, as there's no need for a water tank in the loft. Read our full review to find out whether the EcoTEC plus 637 is the right boiler for your home, and more importantly, whether Vaillant combi boilers benefit from good brand reliability.
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Vaillant ecoTEC plus 637

  • Launch date: May 2012
  • Type: Gas or LPG
  • Which? score: Subscribe
Typical price
£1,240.00
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Specification
Type of boiler System
Heat output band (kW) 37.0
Fuel type Gas or LPG
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