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5 Best Boilers of 2015

Updated: Sep 11, 2015

FurnaceCompare tracks more than 450 series of boilers. Of those sold in 2015, which are most highly rated by homeowners?

The list below represents the top-rated boilers available for sale in the US and Canada. These furnaces vary in efficiency from 82.2% to 95% efficient, as measured by the Annual Fuel Utilization Efficiency or AFUE. They also vary in features and price.

Rank Brand and Series Consumer Rating Efficiency (AFUE) Average Pricing
5. Burnham Alpine 3.6 out of 5 95% $4,088.95
The Burnham Alpine boiler is a gas-fired, stainless steel, condensing unit available in six sizes. It is available as a wall-hung or floor-mounted unit and is equipped with the Sage2.1 Control System, which includes an LCD diagnostic touchscreen and allows linking of up to eight Alpine boilers.
4. Peerless MI 3.75 out of 5 up to 82.2% $2,269.95
The Peerless Series MI gas-fired, cast iron boiler is designed for natural draft use with a conventional chimney. It is available with spark ignition and has a low-profile design, allowing installation in areas with low clearance. Other features include easily accessible controls, an electrically operated vent damper, and a boiler reset control with low water cut-off.
3. Slant/Fin Sentry 4.5 out of 5 up to 84.4% $1,850.94
Slant-Fin's Sentry is a gas-fired cast iron boiler available in five sizes. It features front-mounted controls for easy installation and maintenance, and an advanced natural draft design provides efficient operation and reliability.The Sentry's lower profile design makes it easy to install in sites with limited space or low chimney connections.
2. Lennox GWM-IE 4.9 out of 5 up to 95% not available
The Lennox GWM-IE is a gas modulating condensing boiler which the manufacturer states provides up to 40% greater efficiency than conventional boilers. Its modulating burner is designed to operate on a low setting most of the time, reducing sound levels and fuel costs while maintaining a precise temperature.
1. Bosch Greenstar 5 out of 5 95% $2,995.00
The Bosch Greenstar gas boiler uses a combustion process which achieves up to 95% efficiency and reduces nitrous oxide emissions. It is available as a heat-only or combination boiler and can be installed as a floor-standing or wall-mounted unit.


Consumers and homeowners have submitted thousands of reviews to this site. In addition to reviewing a particular model of equipment, the reviewer also assigns a rating from 1 ("Very Unsatisfied") to 5 ("Very Satisfied"). The following list ranks the top 5 boiler series from worst to best, based on the average of those consumer satisfaction ratings.

FurnaceCompare.com has collected reviews on more than 80 different brands and 250 different series of boilers. However, we have only included a series on this list if we have at least 5 reviews of that series, and if the series is available in 2015. If we only have a few reviews, there is a risk that a single homeowner will skew the average rating too far in one direction or another.


The prices displayed are the average prices that we found on the websites of internet retailers that sell this particular series of boiler.

Note that prices -- even when they are published online -- can vary substantially based on the capacity of the unit in question: 24,000 BTU units are typically cheaper than 60,000 BTU units of the same brand and series.

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