HTP's space heating boilers provide ultimate comfort and the best overall efficiency ratings while keeping maintenance and operating costs to a minimum. With a HTP high efficiency boiler you can achieve the heat your family or business needs while also saving money and energy.
Not sure which type of space heater is right for you? Learn more by viewing our space heating selection guide
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HTP has several water heating options for your needs: tank type water heaters, tankless water heaters, our Crossover series water heaters, or supply boilers. HTP also has models for both your residential or commercial needs.
Not sure which type of water heater is right for you? Learn more by viewing our water heating selection guide
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HTP's Indirect Water Heaters can be a part of your combination heating system whether you need indirect tanks or storage tanks for your residential or commercial needs.
Not sure which type of indirect water heating option is right for you? Learn more by viewing our indirect water heating selection guide.
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Combination appliances save homeowners money on operating expenses, reduces overall installation costs, and takes up less space than traditional space heating and hot water appliances.




| PRODUCT | Elite FT - 399,000 BTU model | EnduroTI - 399,000 BTU model | Mod Con | Mod Con Double Stack | |
|---|---|---|---|---|---|
| Summary | Best-in-class high efficiency,medium-mass boiler | Best-in-class high efficiency,high-mass boiler | High-capacity commercial heating boiler | High-capacity commercial heating boiler | |
| Efficiency | 93.2% Thermal Efficiency | Up to 93% Thermal Efficiency | 94% Thermal Efficiency | 94% Thermal Efficiency | |
| Turndown Ratio | 5:1 | Up to 10:1 | 5:1 | 10:1 | |
| Range | One commercial model at 399,000 BTUs (Plus six residential models) | Two commercial models at 750,000 and 1,000,000 BTUs | Two models from 500,000 to 850,000 BTUs | Two models: 1 Million and 1.7 Million BTUs |
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| Serviceability | Removable front cover for easy access to components | Removable front cover for easy access to component, plus a swing out door for easy access to heat exchanger | Removable front cover for easy access to components | Removable front cover a with easy access to components |
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| Design | Top and bottom connections for installation flexibility | Small footprint (750 model); will fit through a standard door opening. Caster wheels on bottom for mobility | Compact and lightweight; robust cabinet allows units to be double-stacked without additional racks | Compact and lightweight, units are double stacked for higher BTU outputs and greater turndown | |
| Construction | Quality 316L stainless steel heat exchanger | Manufactured out of AISI 316 Ti, an extremely durable stainless steel and titanium blend | All stainless steel construction resulting in a lightweight, durable package | Stainless steel construction for excellent heat transfer properties | |
| Venting | PVC; up to 200 feet total equivalent length | PVC, CPVC, or Stainless Steel Venting; up to 140 feet total | PVC, CPVC, or stainless steel; up to 200 feet total equivalent length | PVC, CPVC, or stainless steel; up to 200 feet total equivalent length | |
| Control Features | Two-line 20-character LCD control panel; capable of cascading up to 8 boilers; includes outdoor reset capability and indirect water heater integration | 928 Intelligent Control System; capable of cascading up to 8 boilers; includes freeze protection, outdoor reset capability | USB port for connection to a computer; capable of cascading up to 8 boilers; includes outdoor reset capability | USB port for connection to a computer; capable of cascading up to 8 boilers; includes outdoor reset capability | |
| Tax Credit Eligibility | Rebates vary by state:
Check- dsireusa.org for state & utility eligibility |
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| Warranty | 12 year limited warranty |
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10 year limited warranty | 10 year limited warranty | |
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