Boiler Ratings by Brand

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A residential boiler's boiler rating or 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 brandname.

Brands with the Highest Fleet Efficiency

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

1. TRIANCO-HEATMAKER
2. AXEMAN-ANDERSON CO
3. VIESSMANN MANUFACTURING
4. WEIL-MCLAIN
5. LAARS

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

1. MUNCHKIN (tied for first place)
2. HAMILTON ENGINEERING (tied for first place)
3. GLOWCORE
4. THERMAL SOLUTIONS
5. NEWMAC MFG.

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.