The U.S. Boiler (Burnham) Alta ALTA-120 is a 120,000 BTU/h input, wall-hung, high-efficiency condensing gas boiler for heat-only hydronic systems, rated for altitudes from 0 to 10,000 ft. It has a stainless steel heat exchanger and U.S. Boiler's OneTouch control.
Key features
- OneTouch control: about a 5-minute commissioning, sets combustion automatically and converts to LP without extra kits
- Modulates by firing rate without an outdoor reset sensor (outdoor sensor not required)
- 10:1 turndown
- High-altitude operation with zero or minimal derate
- Works at low gas pressure: 2.5 in. w.c. natural gas, 8.0 in. w.c. LP
- Wall-hung, with three-side service access; floor stand available
Specifications
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Brand: U.S. Boiler Company (Burnham)
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Manufacturer part number: ALTA-120-1G00
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Input: 120,000 BTU/h maximum
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Efficiency: 95% (ENERGY STAR rated, AHRI certified)
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Fuel: Natural gas or propane
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Elevation: 0-10,000 ft
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Heat exchanger: Stainless steel
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Circulator: Grundfos boiler pump included
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Gas inlet: 1/2"
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Heating supply / return: 1-1/4" / 1-1/4"
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Venting: 2" vent; CPVC, polypropylene or PVC per the venting instructions
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Safety: Boiler flow safety switch (UL 353)
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Manufacturer's warranty: 5-year parts, 12-year limited on the heat exchanger
Optional accessories (sold separately)
- Floor stand
- Heat-only primary/secondary manifold kit
- DHW accessory kit
- CPVC starter and PVC vent kit, OneVent system
Gas piping, venting, condensate disposal and electrical connections must be made by a licensed installer, to the U.S. Boiler manual and local code.