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Best Commercial Boiler Brands for 2026
Boilers heat most multifamily, mixed-use, and older commercial buildings in New York. We ranked the commercial boiler brands we install and service, with a focus on condensing efficiency and LL97 compliance.
How we ranked these brands
- Efficiency — published part-load ratings for commercial boilers, not marketing peaks
- Reliability — what we see in the field across NYC and Long Island buildings
- Parts & service network — how fast parts and qualified techs reach a NY metro job
- Controls & LL97 fit — building automation integration and an electrification path
Ratings, efficiency, and warranty terms vary by model and change often. Confirm current manufacturer specifications for your exact model before specifying.
The Top 7 Commercial Boiler Brands — Ranked
Lochinvar
A. O. Smith
Strengths
- Excellent condensing efficiency
- Strong NY metro parts supply
- Easy cascade setups
Watch out: Needs proper water treatment to reach full life.
Viessmann
Carrier Global
Strengths
- Stainless steel heat exchangers
- Very high efficiency
- Advanced controls
Watch out: Premium pricing and specialized service.
Cleaver-Brooks
Cleaver-Brooks Inc.
Strengths
- Proven large-capacity steam and hot water
- Robust construction
- Strong engineering support
Watch out: Overkill for small buildings.
Weil-McLain
SPX / Marley-Wylain
Strengths
- Familiar to NYC techs
- Cast iron and condensing options
- Good parts access
Watch out: Cast iron models are less efficient than condensing.
Burnham Commercial
Burnham Holdings
Strengths
- Strong steam boiler lineup
- Made in USA
- Durable cast iron sections
Watch out: Condensing lineup narrower than leaders.
Raypak
Rheem Manufacturing
Strengths
- Compact designs
- Good for hot water loads
- Competitive pricing
Watch out: Less common for space heating in large buildings.
Bosch Commercial
Bosch Thermotechnology
Strengths
- Solid European engineering
- Good efficiency
- Compact wall-hung options
Watch out: Smaller local parts network.
Planning a boiler replacement?
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