The 37 kw ecoTEC is Vaillant’s most powerful system boiler in their range, as such it is suited to houses with large heat loads.

Despite its power the 637 is one of the most economical boilers on the market with a very impressive 89.4% heating efficiency as tested by SAP.

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Electric Immersion Heater Included
A-rated Boiler Could Mean £200 + Gas Bill Savings
Installed By Local Hassle Free Boilers Engineers
5 Year Standard Warranty
2 Stage Frost Protection System
Push-Button Intuitive Programming

See Also:

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