HTP Endurance
Model Number: END
High-capacity American condensing boiler for demanding applications.
Technical Specifications
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
- END
- Efficiency (AFUE)
- 95%
- Boiler Type
- Condensing Boiler
- BTU Input Range
- 80k - 399k BTU
- In Production
- Yes
- Parts Warranty
- 5 years
- Heat Exchanger Warranty
- 12 years
Specification source not yet linked — figures are being verified against manufacturer data.
Ideal For
Larger homes or light commercial heating
Expert Review: HTP Endurance
The HTP Endurance is the high-capacity fire-tube option for demanding applications. At 96% AFUE, this condensing boiler handles larger Nassau County homes and light commercial heating. The commercial DNA provides exceptional reliability.
American manufacturing in Massachusetts ensures quality. Parts availability through the HTP network supports local service.
Our recommendation: The Endurance is ideal for larger homes or light commercial applications where fire-tube reliability is essential.
Key Features & Technology
High-capacity condensing
Fire-tube design
Commercial-residential crossover
American manufacturing
Cascade capable
Advantages
- Handles larger heating loads
- Commercial DNA
- American manufacturing
- Good warranty backing
Considerations
- Higher price point
- May be overkill for smaller homes
- Fewer local distributors
Sizing & Installation Notes
Condensing boilers like the Endurance 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 HTP installation starts with a free in-home assessment covering the heat-loss calculation, venting and chimney condition, and gas or oil supply sizing. Learn more about our boiler installation process, or see current rebate and incentive programs that may apply.
Warranty & Protection
Parts Warranty
5 years
Heat Exchanger
12 years
Our Guarantee
100% Satisfaction
All HTP boiler installations by Home+ Air & Heat include our 1-year workmanship warranty, covering labor and any installation-related issues.
Compare the HTP Lineup
| Model | Efficiency | BTU Range | Fuel | Heat Exchanger Warranty |
|---|---|---|---|---|
| Endurance (this model) | 95% AFUE | 80k - 399k BTU | — | 12 years |
| UFT-100W | 96% AFUE | 60k - 199k BTU | — | 12 years |
| Crossover | 95% AFUE | 60k - 150k BTU | — | 12 years |
See the full HTP brand page for lineup context, or browse the Best Condensing Boilers guide to compare across brands.
Frequently Asked Questions
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