Best Condensing Boilers of 2027
Quick answer: For most homes in 2027, the best condensing boiler brands are Viessmann (Vitodens series) and Bosch (Greenstar) for premium build quality, and Navien and Lochinvar for strong value and wide service networks. Condensing boilers only deliver their rated efficiency when the system runs at low return-water temperatures — sizing and piping design matter as much as the brand.
What Matters in a Condensing Boiler
Condensing boilers capture heat that conventional boilers vent away. Here's what separates a good install from an expensive disappointment.
Real-World Efficiency
The 94-98% AFUE rating only happens when return water stays below ~130°F. Oversized radiators or radiant floors condense well; undersized baseboard may not.
Heat Exchanger Material
Stainless steel exchangers resist corrosion better than aluminum in most water conditions. Check what the brand uses and what the warranty actually covers.
Annual Service Is Mandatory
Condensing boilers need yearly combustion analysis and condensate trap cleaning. Skip it and efficiency — and the heat exchanger — degrade fast.
Warranty Registration
Most brands require registration within 60-90 days of install for full heat-exchanger coverage. Miss the window and coverage drops sharply.
Condensing Boiler Brands, Ranked
Every condensing model family we track, grouped by brand. Discontinued lines are excluded so you're only choosing from equipment that's still supported.
6 condensing model families
Vitodens 200-W, Vitodens 100-W, Vitocrossal 200 CI2 +3 more
Max AFUE
98%
5 condensing model families
Ultra Series 3, Evergreen Pro, GV90+ +2 more
Max AFUE
95%
4 condensing model families
Trinity TFT60-399, TRX085-199, FTVN085-199 +1 more
Max AFUE
95%
4 condensing model families
VSL II, Bobcat B-120A/200A, CHS-85-399 +1 more
Max AFUE
95%
4 condensing model families
Bimini BWC, Phantom II, Velocity Phantom Combi +1 more
Max AFUE
95%
2 condensing model families
SSB (Buderus SSB85/120/160), Greenstar (wall heating-only)
Max AFUE
96%
Every Condensing Boiler Model Family We Track
| Brand | Model family | Type | AFUE | Size range |
|---|---|---|---|---|
| Takagi | TK-540X3 | Condensing | 95% | 60k–199k |
| Buderus | GB142 | Condensing | 95% | 50k–199k |
| Lochinvar | Knight WHN | Condensing | 96% | 55k–399k |
| U.S. Boiler Company | Alta | Condensing | 95% | 14k–200k |
| Dunkirk | Q95M | Condensing | 95% | 80k–200k |
| IBC Technologies | VFC 15-175 | Condensing | 96% | 15k–175k |
| ECR International | EV90+ Evolution | Condensing | 95% | 60k–199k |
| Weil-McLain | Ultra Series 3 | Condensing | 95% | 80k–399k |
| Viessmann | Vitodens 200-W | Condensing | 96% | 20k–199k |
| Laars | Mascot FT | Condensing | 95% | 80k–250k |
| HTP | UFT-100W | Condensing | 96% | 60k–199k |
| Burnham | Alpine ALP150 | Condensing | 95% | 80k–150k |
| Rinnai | E-Series | Condensing | 95% | 60k–199k |
| Viessmann | Vitodens 100-W | Condensing | 96% | 20k–120k |
| Navien | NFB-H | Condensing | 95% | 13k–200k |
| Lochinvar | Noble NKC | Condensing | 95% | 55k–285k |
| IBC Technologies | DC Series | Condensing | 95% | 40k–199k |
| Laars | NeoTherm | Condensing | 96% | 80k–500k |
| ECR International | Benchmark | Condensing | 92% | 75k–250k |
| IBC Technologies | SL Series | Condensing | 95% | 30k–125k |
| Takagi | T-H3S | Condensing | 95% | 50k–160k |
| Lochinvar | Crest | Condensing | 95% | 55k–199k |
| HTP | Endurance | Condensing | 95% | 80k–399k |
| Noritz | NCB-H | Condensing | 95% | 60k–199k |
| Bosch | SSB (Buderus SSB85/120/160) | Condensing | 96% | 17k–160k |
| Navien | NHB | Condensing | 95% | — |
| Rinnai | M-Series | Condensing | 95% | 60k–175k |
| Buderus | G234X | Condensing | 95% | 100k–285k |
| U.S. Boiler Company | Aspen | Condensing | 96% | 9k–399k |
| Peerless | Purefire PF-50-210 | Condensing | 95% | 16k–210k |
| Peerless | Purefire PF-399-850 | Condensing | Not verified | 80k–1500k |
| NTI Boilers | Trinity TFT60-399 | Condensing | 95% | 15k–399k |
| Slant/Fin | VSL II | Condensing | 92% | 90k–250k |
| Dunkirk | Royal HE | Condensing | 95.2% | 80k–200k |
| Viessmann | Vitocrossal 200 CI2 | Condensing | 98% | 399k–2000k |
| Utica | Oneida HE | Condensing | 95.2% | 80k–200k |
| Weil-McLain | Evergreen Pro | Condensing | 95% | 110k–399k |
| Weil-McLain | GV90+ | Condensing | 91.9% | 70k–175k |
| Burnham | Alpine | Condensing | 95% | — |
| Weil-McLain | ECO Tec | Condensing | 95% | 80k–199k |
| Weil-McLain | Ultra Gas Series 4 | Condensing | 94.1% | 80k–399k |
| Crown Boiler | Bimini BWC | Condensing | 95% | 30k–300k |
| Navien | NFB-C | Condensing | 97.5% | — |
| Viessmann | Vitocrossal 200 CM2 | Condensing | 95% | 131k–2245k |
| New Yorker Boiler | GHE-II heating | Condensing | 95% | 8k–180k |
| Viessmann | Vitocrossal 300 CU3A | Condensing | 98% | 19k–199k |
| Crown Boiler | Phantom II | Condensing | 95% | 8k–180k |
| Crown Boiler | Velocity Phantom Combi | Condensing | 95% | 16k–199k |
| Bosch | Greenstar (wall heating-only) | Condensing | 95% | 13k–152k |
| Viessmann | Vitocrossal 300 CA3B | Condensing | 96.1% | 2500k–6000k |
| Slant/Fin | Bobcat B-120A/200A | Condensing | 93% | 30k–200k |
| Slant/Fin | CHS-85-399 | Condensing | 95% | 17k–399k |
| NTI Boilers | TRX085-199 | Condensing | 95% | 20k–199k |
| NTI Boilers | FTVN085-199 | Condensing | 95% | 20k–199k |
| Navien | NHB-H | Condensing | 95% | 8k–150k |
| NTI Boilers | Trinity Lx150-800 | Condensing | 95% | 30k–800k |
| Slant/Fin | Jaguar J-390C | Condensing | 90.2% | 390k |
| Lochinvar | Knight XL | Condensing | 96.2% | 80k–800k |
| Lochinvar | Knight Fire Tube | Condensing | 95% | 11k–285k |
| Crown Boiler | Velocity Phantom-X | Condensing | 95% | 8k–210k |
| U.S. Boiler Company | K2 | Condensing | 95% | 80k–180k |
Condensing Boiler Brand Matchups
Head-to-head comparisons between brands that both make condensing boilers.
Burnham vs Crown Boiler
2 vs 4 condensing models tracked
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Weil-McLain vs Slant/Fin
5 vs 4 condensing models tracked
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Weil-McLain vs Burnham
5 vs 2 condensing models tracked
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Navien vs Bosch
4 vs 2 condensing models tracked
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Navien vs Lochinvar
4 vs 5 condensing models tracked
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Viessmann vs Navien
6 vs 4 condensing models tracked
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Navien vs Rinnai
4 vs 2 condensing models tracked
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Buderus vs Viessmann
2 vs 6 condensing models tracked
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Lochinvar vs Weil-McLain
5 vs 5 condensing models tracked
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Peerless vs Crown Boiler
2 vs 4 condensing models tracked
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Peerless vs Dunkirk
2 vs 2 condensing models tracked
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Utica vs U.S. Boiler Company
1 vs 3 condensing models tracked
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Condensing Boiler FAQs
What's the best condensing boiler brand?
Viessmann's Vitodens series is the benchmark for build quality and controls, with Bosch Greenstar close behind. Navien and Lochinvar offer strong efficiency at lower price points with large service networks. The best pick depends on your installer — a brand your contractor services regularly beats a premium badge installed by someone learning on your job.
How much does a condensing boiler cost installed?
Condensing boiler installation typically runs $9,000-$16,000 depending on size, venting, condensate handling and piping modifications. Combi versions that also make domestic hot water run higher. Always get an in-home assessment with a heat-loss calculation.
Do condensing boilers really save money?
Yes, when the system is designed for them. Expect roughly 10-15% lower fuel use versus an 82% AFUE cast iron boiler — but only if return-water temperatures stay low enough to condense. Homes with radiant floors or generous baseboard see the best savings; homes with minimal baseboard may see little benefit.
How long does a condensing boiler last?
A well-maintained condensing boiler typically lasts 12-18 years — shorter than cast iron's 25-30. Annual service, proper water treatment and correct sizing are what separate the units that reach 18 from the ones that fail at 8.
Considering a Condensing Boiler?
We'll check whether your radiation and piping will actually let a condensing boiler condense — and tell you honestly if cast iron is the smarter buy.
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