U.S. Boiler Alta
Model Number: ALTA
Burnham-quality condensing boiler at more accessible pricing.
Technical Specifications
Source: manufacturer spec sheet · checked Sep 27, 2026
Prices depend on sizing, venting and piping in your home, so we quote every installation.
Sizing: the right size comes from a room-by-room heat-loss calculation, not the size of the old boiler or a rule of thumb. Oversized boilers short-cycle and waste fuel; steam systems are sized to the connected radiation instead. See how we approach boiler installation.
Home-Specific Operating Cost Review
No guaranteed annual savings or payback period
Historical Use
Fuel consumption and weather
Current Rates
Utility and delivered-fuel prices
System Design
Load, piping, controls, and temperatures
Full Specifications
- Model Number
- ALTA
- Efficiency (AFUE)
- 95%
- Boiler Type
- Condensing Boiler
- Fuel
- natural gas/propane
- Venting
- direct vent
- BTU Input Range
- 14k - 200k BTU
- Domestic Hot Water
- combi and heat-only
- In Production
- Yes
- Parts Warranty
- 5-year
- Heat Exchanger Warranty
- lifetime limited
Specifications sourced from the manufacturer spec sheet, checked Sep 27, 2026.
Ideal For
Budget-conscious homes wanting Burnham quality
Expert Review: U.S. Boiler Alta
Burnham-quality condensing boiler at more accessible pricing.
Stainless steel heat exchanger Same quality as Burnham Modulating operation Outdoor reset American manufacturing Listed input range: 14–200 MBH input. Rated efficiency on file: 95% (confirm the rating method for the exact size on the spec sheet). Venting on file: direct vent. Warranty on file: heat exchanger lifetime limited; parts 5-year.
It is best suited to budget-conscious homes wanting Burnham quality. Before ordering, a contractor should complete a room-by-room heat-loss calculation, check the distribution system's water temperatures and confirm venting and clearances against the installation manual.
Pros: Condensing design captures heat from flue gases when return water is cool enough. Modulating burners can match output more closely to mild-weather loads. Multiple sizes (14–200 MBH input) allow sizing to a calculated heat loss. Considerations: Brand may confuse buyers Less marketing than Burnham Some models special order Condensing efficiency depends on low return-water temperatures; high-temperature radiation may limit real-world savings.
Specifications on this page come from the manufacturer documents linked below; always confirm figures for the exact size being installed.
Key Features & Technology
Stainless steel heat exchanger
Same quality as Burnham
Modulating operation
Outdoor reset
American manufacturing
Listed input range: 14–200 MBH input.
Rated efficiency on file: 95% (confirm the rating method for the exact size on the spec sheet).
Venting on file: direct vent.
Warranty on file: heat exchanger lifetime limited; parts 5-year.
Advantages
- Condensing design captures heat from flue gases when return water is cool enough.
- Modulating burners can match output more closely to mild-weather loads.
- Multiple sizes (14–200 MBH input) allow sizing to a calculated heat loss.
Considerations
- Brand may confuse buyers
- Less marketing than Burnham
- Some models special order
- Condensing efficiency depends on low return-water temperatures; high-temperature radiation may limit real-world savings.
Sizing & Installation Notes
Condensing boilers like the Alta reach their rated efficiency only when return water runs cool enough to condense flue gases. We check your radiation and design water temperatures so the unit actually condenses in your home, not just on the spec sheet.
Every U.S. Boiler Company installation starts with a free in-home assessment covering the heat-loss calculation, venting and chimney condition, gas or oil supply sizing, and permit requirements for your town. Learn more about our boiler installation process, or see current rebate and incentive programs that may apply.
Warranty & Protection
Parts Warranty
5-year
Heat Exchanger
lifetime limited
Our Guarantee
100% Satisfaction
All U.S. Boiler Company boiler installations by Home+ Air & Heat include our 1-year workmanship warranty, covering labor and any installation-related issues.
Compare the U.S. Boiler Company Lineup
| Model | Efficiency | BTU Range | Fuel | Heat Exchanger Warranty |
|---|---|---|---|---|
| Alta (this model) | 95% AFUE | 14k - 200k BTU | natural gas/propane | lifetime limited |
| ES2 | 85% AFUE | 70k - 280k BTU | natural gas | Lifetime limited |
| K2 | 95% AFUE | 80k - 180k BTU | natural gas/propane | lifetime limited |
| Ambient electric | Not verified | Various sizes available | electric | — |
| Aspen | 96% AFUE | 9k - 399k BTU | natural gas/propane | lifetime limited |
| Ambient HP | Not verified | Various sizes available | electric | — |
See the full U.S. Boiler Company brand page for lineup context, or browse the Best Condensing Boilers guide to compare across brands.
Frequently Asked Questions
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