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2018 Boiler Ratings by Brand

Updated: May 2, 2018

Homeowners can compare residential boilers by two different types of ratings: consumer satisfaction ratings and efficiency ratings. This page ranks different brands of boilers by both sets of ratings. has collected thousands of reviews from homeowners since 2006. Each reviewer assigns a rating from 1 ("Very Unsatisfied") to 5 ("Very Satisfied") that describes their impression of their boiler. This list ranks boilers from best to worst, based on the average of those consumer satisfaction ratings.

  1. Bosch
  2. Slant-fin
  3. Westinghouse
  4. Lennox
  5. Crown
  6. Weil-mclain
  7. Lochinvar
  8. Viessmann
  9. Triangle Tube
  10. Williamson-thermoflo
  11. Htp
  12. Ny Thermal
  13. Buderus
  14. Biasi
  15. Utica
  16. Burnham
  17. Peerless
  18. Laars
  19. Navien
  20. Dunkirk
  21. Baxi

While we have collected reviews on more than 70 different brands of boilers, we have not included all those brands in the list above. For most of those brands we only have a handful of reviews, and that raises the risk that a single reviewer could bias the average rating too far in one direction. For that reason, we have only included the average rating for brands that at least 10 consumers have reviewed. However, you are welcome to read all of our boiler reviews.

A residential boiler's efficiency rating is typically measured by its AFUE (Annual Fuel Utilization Efficiency). Commercial boiler efficiency is often measured by combustion efficiency rather than AFUE. The "fleet efficiency" of a particular brand is the average efficiency of all of the models sold under that brand name.

Brands with the Highest Fleet Efficiency

Gas, Oil, LPG and Combination Boilers (Brands with more than 20 models)

  1. Trianco-Heatmaker
  2. Axeman-Anderson
  3. Viessmann
  4. Weil-McLain
  5. Laars

Gas, Oil, LPG and Combination Boilers (Brands with 20 or fewer models)

  1. Heat Transfer Products (tied for first place)
  2. Hamilton Engineering (tied for first place)
  3. Glowcore
  4. Thermal Solutions
  5. Newmac

Notes on Boiler Ratings

The "fleet efficiency" or "boiler rating" of a particular boiler brand indicates nothing about boiler quality or boiler durability. In addition, although the fleet efficiency of one brand might exceed that of another, this does not necessarily indicate that any particular model of boiler marketed under the first brand out-performs any particular model of boiler marketed under the second. To determine whether one model outperforms another, simply compare the AFUE of the two models.

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