- 70 – 245 MBH (Induced draft, 6 sizes)
- Power vented using indoor combustion air, optional direct vent kit using outdoor sealed combustion air
- Perfect for installations with unusable chimneys
- Includes supply line manifold with relief valve and T/P gauge connections
- Advanced controls, accessible inside boiler jacket
- Integrated boiler control with diagnostics
- FREE additional pump relay
- Integral LWCO included, requires no piping! (IDL-1200)
- American-made cast iron heat exchanger
- Designed to promote turbulent water flow within the section for efficient heat transfer
- Lifetime limited warranty
- Made in Lancaster, PA, USA
Series 2
Legendary Reliability and Value, Improved for Even Higher Performance
For decades, the Series 2 has been the industry benchmark for cast iron gas-fired boilers. Its time proven design blends a long lasting cast iron heat exchanger with a heavy-duty steel base and high quality boiler controls to provide exceptional value for the homeowner. Heating professionals across the country have relied on the Series 2 to provide their customers years of comfortable, low maintenance operation making it an exceptional value in your home.
Product Features
- 84% AFUE efficiency upgrade
- Meets DOE-2021 government requirements
- 8 sizes available, 38-276 MBH
- Chimney vented
- Standard tapping locations and intuitive electronic controls reduce installation costs
- Direct replacement for thousands of existing boiler installations
- Concealed, protected controls and components
- Lifetime limited warranty
Control Highlights
- INCLUDES pre-installed IDL-1200 low water cut off
- Easy-to-use three button operation and optional adjustments
- Two pump relays for an additional heating zone or indirect water heater
Control Features for Homeowner Comfort and Savings
- Energy-saving “thermal purge” circulates residual heating water before burning fuel
- Domestic hot water priority feature ensures uninterrupted supply of hot water for indirect water heaters
Alliance LT
The Alliance LT works in conjunction with the boiler to provide practically limitless domestic hot water. It has a faster recovery rate than competing tank type electric, gas or oil-fired hot water heaters, insuring plenty of hot water when you need it for your active lifestyle. The Alliance LT is a long-life, corrosion resistant tank, featuring a thermoplastic-lining, making it the perfect choice for any application particularly when water quality, hardness, softness, and chlorides are an issue.
Thermoplastic Lining
The greatest enemies of any water heater are corrosion and rust. The best defense against those enemies is to avoid tank materials that can rust or corrode. By utilizing a proprietary double-bonded thermoplastic tank liner, the Alliance LT can handle even the most aggressive water conditions by continuously replenishing and rebalancing antioxidant levels throughout the storage vessel. This means that the tank won’t rust, and the thermoplastic construction will keep the tank performing over its long service life.
The Alliance LT is a long-life, corrosion resistant tank, featuring thermoplastic-lining:
- Impervious to water quality variations
- Minimal maintenance required
- No anode rod required
- Advanced TPI thermostat control
- 10-year residential warranty and optional lifetime warranty available!
Easy, low cost installation:
- Top connections, flexible alignment
- Bolted topside coil access – no tank draining
- Offers lower weight, ease of transport
K2 Combi
The NEW high efficiency K2 Combi condensing boiler provides more options for home heating and hot water solutions! Designed and built in the USA at U.S. Boiler’s manufacturing facility in Lancaster, PA, the K2 Combi offers the same kind of efficient, reliable performance that you come to expect from U.S. Boiler Company.
Value-priced with Premium Features
- 95% AFUE with 10:1 turndown
- Reliable, proven stainless steel heat exchanger technology
- Flat plate heat exchanger provides superb domestic hot water performance
- Factory pre-set Sage2.3 Control System, providing out-of-the-box high performance
- Touch screen diagnostic display with plain-language guidance
- FREE 5-year parts warranty included
- Low NOx (meets requirements of South Coast Rule 1146.2)
Extra Built-in Features
- Universal boiler vent connections for polypropylene, CPVC/PVC, and flexible stainless steel
- Outdoor reset and sensor
- Pre-installed safety relief valve piping
Optional K2 Combi Condensing Boiler Accessory:
Sage Zone Control Circulator Panel or Valve Panel – Precisely calculates heating demand from different zones and “re-sizes” the boiler for optimum efficiency and whole home comfort.
K2
Contractors told us exactly what they wanted.
A value-priced, high efficiency condensing boiler that is simple enough to install quickly AND offers valuable extras not found on competitive models. U.S. Boiler Company has delivered. The K2 offers a comprehensive feature list, unequalled ease of setup, maintenance, and operation in a package that costs far less than you’d expect for the impressive value that’s built in. And best of all, it’s built and tested with pride in Lancaster, Pennsylvania by U.S. Boiler Company.
Furthermore, with the advanced Sage2.3™ Control System, the K2 condensing boiler now offers 10:1 turndown and impressive gains in efficiency. The K2 is 95% AFUE for all sizes!
The K2 condensing boiler’s simplified design includes a hinged inner door that isolates electronics and controls from combustion and waterside components, making for fast, clutter-free service access. Venting the K2 is simple as well, regardless of whether one pipe, two pipe, horizontal or vertical configurations are needed.
Value-priced with Premium Features
- 95% AFUE with 10:1 turndown
- Five wall hung models; 80, 100, 120, 150, 180 MBH
- Reliable, stainless steel heat exchanger technology
- Factory pre-set Sage2.3 Control System, providing out-of-the-box high performance
- Touch screen diagnostic display with plain-language guidance
- High altitude – Minimal de-ratings, reduces the costs of oversizing, field adjustable
- FREE 5-year parts warranty included
- Low NOx•
•Meets requirements of South Coast Rule 1146.2
Extra Built-in Features
- High capacity pre-installed boiler loop circulator
- Split-voltage junction box
- Universal boiler vent connections for polypropylene, CPVC/PVC, and stainless steel
- Outdoor reset and sensor
Optional K2 Condensing Boiler Accessories:
Sage Zone Control Circulator Panel or Valve Panel – Precisely calculates heating demand from different zones and “re-sizes” the boiler for optimum efficiency and whole home comfort.
Fastpipe – Make K2 connections simple with the ready-made primary/secondary piping solution that saves installation time and cost.
K2 Condensing Boiler by U.S. Boiler Company
K2 Heat Exchanger
K2 Cold Burner Door Video
Aspen Light Com
Do you find yourself wishing that the Aspen line included larger sizes so you could have a light commercial boiler with a reliable, field-proven, stainless steel firetube heat exchanger? Wish no more!
The Aspen line now includes a 320 and 399 MBH model so you can efficiently heat larger applications. Impressively, this boiler can be wall or floor mounted due to a pre-installed wall bracket and adjustable feet. Also unique to this boiler is the ability to swap the touch screen display and boiler logo badge for optimal ergonomics!
Sizes:
- Two light commercial models; 320 & 399 MBH
Premium Features:
- Up to 95% Thermal efficiency with 10:1 turndown
- High efficiency and low emissions!
- Field-proven, stainless steel fire tube heat exchanger with low pressure drop
- Advanced Sage2.3™ boiler control provides “out-of-the-box” high performance and easy setup
- Touch screen display simplifies installation, operation, and diagnostics
- Easily connects to optional Sage Zone Controls for additional energy savings, system optimization, and “short cycle” prevention
- Configured for lead/lag operation
- High altitude – zero or minimal de-rating reduces the costs of oversizing, field adjustable
- Low NOx•
•Meets requirements of South Coast Rule 1146.2
Valuable Extras:
- Universal vent connection for CPVC/PVC, polypropylene, and stainless steel flex
- Split-voltage junction box, fused easy-connect terminals
- Outdoor reset and sensor
Aspen
The high efficiency boiler designed for efficiency, performance, and versatility.
On the outside of the Aspen high efficiency condensing boiler is sleek, smart, ergonomically optimized styling – an elegant design so striking that it has actually been adopted by others in the industry. But that’s where the comparison ends. On the inside you’ll find a proven stainless steel firetube heat exchanger and an advanced combustion system, designed to set new standards for reliability, efficiency, ease of installation, and operation.
Sizes:
- Six wall hung models; 85, 110, 155, 205, 270 MBH
- Optional floor stand available – NEW!
- Two light commercial models; 320 & 399 MB
- 155 MBH combi model available!
- Best-in-class DHW performance
Premium Features:
- Up to 96% AFUE with 10:1 turndown – High efficiency AND low emissions!
- Field-proven, stainless steel fire tube heat exchanger
- Advanced Sage2.3™ boiler control provides “out-of-the-box” high performance and easy setup
- Easily connects to optional Sage Zone Controls for additional energy savings, system optimization, and “short cycle” prevention
- High altitude – zero or minimal de-rating reduces the costs of oversizing, field adjustable
- Easy access side service panel
Valuable Extras:
- Versatile top and bottom connections for supply & return (heating-only models)
- Universal vent connection for CPVC/PVC, polypropylene, and stainless steel flex
- Split-voltage junction box, fused easy-connect terminals
- Outdoor reset and sensor (wired)
- Piped and wired for low water cutoff installation
- 5-year parts warranty
Sage Zone Control
The keys to making a condensing boiler actually condense
Our fuel saving Sage Zone Control is available for circulators OR zone valves! Whatever your preference, the Sage Zone Control is designed to optimize U.S. Boiler’s extensive line of high efficiency condensing boilers!
In most heating systems, standalone condensing boilers don’t condense all the time. They operate at higher firing rates than necessary, cycle too often, and use more fuel than they need to. The Sage Zone Control is an innovative product that increases boiler efficiency by heating the home using lower firing rates and less boiler cycles.
- Includes HeatMatch software to continuously calculate zone heat demand, measure supply water, and automatically adjusts maximum firing rates to match actual home heat demand without over-firing
- Reduces boiler “short cycling” to extend the life of the heating system
- Three-temperature versatility is perfect for buildings with a mix of high and low heat radiation and/or an indirect water heater
-
Offers three-temperature versatility to better match buildings with a mix of high and low heat radiation and/or an indirect water heater
- Fast Installation – Plug & Play, snap- in RJ45 cable eliminates labor for boiler wiring
- Easy Setup! No high voltage (120V) wire prep is needed for domestic hot water priority
-
The touch screen (on the boiler) allows settings adjustment and monitors individual zone BTUs and cycle history
- Provides your customers with significant fuel savings!
Series X-2
A solid, reliable, full-featured boiler at a value price!
- 70 – 280 MBH (7 sizes)
- All controls concealed inside boiler jacket
- Integrated boiler control with diagnostics
- FREE additional pump relay
- Integral LWCO option requires no piping! (IDL-1200)
- Industry standard tapping locations, allows easy, direct replacement for thousands of existing boiler installations
- American-made cast iron heat exchanger
- Designed to promote turbulent water flow within the section for efficient heat transfer
- Lifetime limited warranty
Alpine Commercial
Do you find yourself wishing that the Alpine line included larger sizes so you could heat shopping malls, high schools, and hospitals with it? Wish no more! The Alpine line now includes 399, 500, 600, 700, and 800 MBH models so you can efficiently heat just about any structure. The new models feature the ease of service and installation you’ve come to expect from the Alpine.
In a commercial setting, the big Alpine sizes have a lot to offer where other boilers might fall short. The Alpine’s small footprint allows even the largest models to pass through a standard doorway, and you can stack them two high in small mechanical rooms where lots of capacity may be needed. For simple lead-lag operation, use an RG-45 phone cord to link Alpine units together.
- Up to 97% thermal efficiency
- 399 – 800 MBH (5 sizes)
- Equipped with Sage2.3™ Boiler Control System, includes built-in sequencer for internal staging of up to eight Alpine boilers.
- For use with natural or LP gas
- Unique, patented polypropylene condensate trap with internal cutoff switch prevents damage to heat exchanger from condensate backup
- Less than 20ppm NOx
- Stackable
Alpine
The high efficiency Alpine condensing boiler by U.S. Boiler Company is one of the most efficient, energy-saving boilers on the market today. Every Alpine boiler is equipped with a number of advanced technologies to constantly monitor boiler performance and match fuel consumption directly to heating demand. The Alpine incorporates outside temperature sensing technology that automatically adjusts the firing rate of the boiler based on the outside air temperature. It also continuously monitors system safety parameters to ensure years of comfortable, safe, reliable operation. Today’s Alpine is the peak of performance!
- High efficiency, condensing boiler – 95% AFUE
- 80 – 399 MBH (6 sizes) 80 – 210 sizes are floor mount or wall hung
- Compact, space-saving modern design
- Industry leading Sage2.3™ Boiler Control System
- Touch screen display for easy user interface to view all system functions
- Available for use with natural or LP gas
- ENERGY STAR Certified – Efficiency tax credits/rebates may apply
- 5-year part replacement warranty (for residential boilers under 300 MBH)
Accessories for the Alpine boiler include:
Sage Zone Control Circulator Panel or Valve Panel – Precisely calculates heating demand from different zones and “re-sizes” the boiler for optimum efficiency and whole home comfort.
Slenderized
Designed for versatility, durability and optimized heat output, the Slenderized radiator is the perfect choice for hot water or steam heat delivery. Offering a sectional design which provides lengths of 7″ to 84″, Slenderized radiators are adaptable to virtually every installation requirement. Made of durable cast iron, these radiators not only provide warm and soothing heat, they also retain heat and provide extended warmth when the boiler is not running. Cast iron construction also virtually eliminates the expansion and contraction sounds associated with other types of radiators, making your home both quiet and comfortable.
- Slim design, durable cast iron construction
- Sectional design, 4 to 48 sections
- Superior heat retention, even heat distribution
- Quiet operation
Radiant
Designed to fit into wall recesses and other enclosures, Radiant Radiators provide unique advantages over other radiator products. The unitized construction of the Radiant Radiator permits the free passage of air through built-in air channels. Cooler air is drawn into the bottom of the radiator, heated, then pushed out the top. The result is a radiator that provides not only radiant heat, but convected (hot air) heat as well! These radiators are designed to be recessed into walls or other enclosures, which enables them to provide heat without taking up floor space. Featuring rugged cast iron construction, Radiant Radiators also have the benefits of other U.S. Boiler cast iron radiators, including smooth and even heat distribution, superb heat retention, and very quiet operation.
- Designed for recesses or enclosures
- Sectional design 4 to 44 sections
- Durable cast iron construction
- Provides radiant and convected heat
- Superior heat retention, even heat distribution
- Quiet operation
Classic
For the ultimate replacement radiator for vintage homes, look no further than Classic Radiators from U.S. Boiler Company. These beautiful cast iron radiators offer the same type of ornate surface detail commonly found on radiators of a bygone era, making them an ideal choice for restoration/renovation projects. Brass valves are also available to complete the elegant look of the Classic Radiator.
Similar to the other radiators in U.S. Boiler’s line, the Classic Radiator is made of durable, cast iron. Offering superb heat retention properties, cast iron radiators provide warm, soothing heating comfort and even distribution of heat in the room. Cast iron construction also provides very quiet heat, as the expansion noises typically associated with other forms of heat distribution are virtually eliminated.
- Available in sizes from 3 to 9 sections
- Can be used in hot water or steam home heating systems
- Superb heat retention
- Rugged construction
- Quiet operation
Baseray
Baseray baseboard radiators put the warm, comfortable and quiet heating of a cast iron radiator in a low profile package. Offering up to 5 times the amount of radiant heat provided by similar metal finned baseboard designs, the rugged and reliable cast iron Baseray baseboard also offers the additional benefit of quiet operation. Cast iron is far less susceptible to the sounds associated with the expansion and contraction of other baseboard radiators, providing both a warm and quiet room. In addition, Baseray baseboards can be painted to coordinate with your room’s color scheme.
- Low profile, durable cast iron construction
- Even heat distribution
- Durable design
- Quiet operation
- Works with all boilers made by U.S. Boiler Company.
Alliance SL
High Efficiency Indirect-Fired Water Heater
The Alliance SL works in conjunction with the boiler to provide practically limitless domestic hot water. It has a higher recovery rate than competing tank type electric, gas or oil-fired hot water heaters, insuring plenty of hot water when you need it for your active lifestyle. The Alliance SL is manufactured with an extremely durable Hydrastone lining, making it the perfect choice for any application particularly when water quality, hardness, softness, and chlorides are an issue. When coupled with the IQ and Sage2.3 Control Systems found on select boilers from U.S. Boiler Company, the Alliance SL can be configured to take priority over space heating if necessary, and can automatically raise the boilers supply temperature to the tank to accelerate the speed at which the Alliance can recover after a significant hot water draw. This key feature is perfect for homes with multiple bathrooms, jacuzzi style tubs and multi-head showers. To further ensure long lasting comfort and performance, the Alliance SL is available with an optional limited lifetime warranty.
- Up to 30% savings over conventional water heaters
- Large layer of high-density R-16 insulation
- Less than 1 degree of temperature loss per hour
- 5 sizes available
- Corrosion resistant Hyrdrastone lining
- High capacity heating coil
- 10/2/1 Limited Manufacturers Warranty
- Optional Limited Lifetime Warranty
V8H
For years, the V8H has been an industry benchmark for cast iron oil-fired boilers. Its time proven design blends a long lasting cast iron heat exchanger with high quality components to provide exceptional value for the homeowner. The V8H is a reliable drop-in replacement for thousands of homes, simplifying and lowering installation costs. Additionally, it is available with a tankless hot water heating coil for those homes that do not have room for a stand-alone water heater. Heating professionals across the country have relied on the V8H to provide their customers years of comfortable, low maintenance operation, making it an exceptional value in your home.
- 85% AFUE or ENERGY STAR certified 87% AFUE available with upgrade kit
- Water or steam applications
- Optional tankless water heater
- Multiple oil burner options for water boilers (Beckett, Carlin, Riello) includes burner cover for quiet operation
- Durable push-nipple connections between boiler sections – will not deteriorate when exposed to petroleum-based antifreeze
- Easy to clean and service – side and stop clean outs provide complete access to flueways
- Full swing-away burner door
- Lifetime limited warranty
MegaSteam
The Most Efficient Cast-Iron Steam Boiler in the World!
The MegaSteam is a U.S. Boiler exclusive. Designed specifically as a residential oil-fired steam boiler, the MegaSteam achieves 86% AFUE efficiency with a 3-pass cast iron heat exchanger – the only one of its kind in the world. Its unique design makes it highly corrosion resistant, a fact that U.S. Boiler Company backs up by giving the MegaSteam the best warranty in its class. Not only does the MegaSteam have a 10-year warranty on the heat exchanger, it has the industry’s ONLY 5-year warranty on water side corrosion. The MegaSteam is available fully packaged with 3 inches of insulation, a deluxe powder-coated steel jacket and brand name components from industry leading companies. Unmatched in the industry!
- Oil-fired boiler
- Unique 3-pass heat exchanger for exceptional efficiency and steam quality
- Unsurpassed 5-year Warranty against water side corrosion
- Tankless coils are available
- Near boiler piping kit available
- 10-year Limited Warranty on the heat exchanger
- Optional 5 or 10-year parts & limited labor warranty
- Extended Boiler Warranty Plans are administered by CornerStone United, Inc.
MPO-IQ
Award Winning High Efficiency Oil Boiler Loaded with Energy Saving Features!
The MPO-IQ blends unmatched performance with long lasting durability and exclusive energy saving features. Designed as an optimal replacement boiler for millions of homes with existing chimneys, the MPO-IQ has the highest average efficiency in its class. Its rating as high as 87% AFUE, easily exceeds ENERGY STAR levels for efficiency and may qualify for tax credits and/or utility rebates (check for availability in your area). At the heart of the MPO-IQ is an advanced 3-pass cast iron heat exchanger, combined with a well-insulated powder-coated steel jacket. Even the MPO-IQs Control System is best in class. The IQ Control System allows the MPO-IQ to be easily equipped with an optional energy saving control package that can achieve up to a 15-20% reduction in fuel consumption according to most studies.
- 87% AFUE
- ENERGY STAR Certified – efficiency tax credits/rebates may apply
- 3-pass cast iron sectional design
- Easy, intelligent IQ Control System
- Outdoor reset available – increases efficiency by 15-20%
- Available direct vent option when a chimney is not available
- Easy installation and servicing
- Reversible sing away burner door, no target wall/blanket, removable rear plates provide direct access to flue passages
- Limited Lifetime Manufacturers Warranty
- Optional 5 or 10-year parts & limited labor warranty
- Extended Boiler Warranty Plans are administered CornerStone United, Inc.
- Extended Boiler Warranty Plans are administered CornerStone United, Inc.
Independence
For Residential Steam Applications
The Independence is a residential, gas-fired boiler for steam systems. It is available for either natural or LP gas and has AFUE ratings of up to 82%. Its large water volume and durable cast iron sections make it an ideal replacement for even the most challenging steam heating system. Standard equipment on the Independence includes cast iron push nipples that provide a permanent, watertight seal between sections, Honeywell operating controls, vent damper, and a rugged steel base assembly. A deluxe, insulated, powder-coated steel jacket completely encloses gas valves and burners, and reduces boiler heat loss. The exclusive Independence PV models have been specifically configured to operate as direct vented products for installation in homes with a damaged or irreparable chimney.
- Natural or LP gas
- Rugged cast iron heat exchanger
- Stainless steel burners
- 10 sizes to meet your specific needs
- Optimum venting flexibility
- A limited 10-year heat exchanger warranty, plus a one-year manufacturer’s parts warranty
- Optional 5 or 10-year parts & limited labor warranty
- Extended Boiler Warranty Plans are administered by CornerStone United, Inc.
Series 3
Advanced Energy Saving Features Integrated with a Modern Design
The Series 3 shares many of its features with the award winning ES2, including the durable cast iron heat exchanger, rugged heavy gauge steel base, and the innovative IQ Control System. The IQ Control System allows the Series 3 to be easily equipped with an optional energy saving control package that, according to many studies, can deliver up to a 15-20% reduction in fuel consumption. In addition, the Series 3 provides even more flexible chimney venting options making it the right choice for millions of homes.
- Natural or LP gas
- Optional LCD touch screen for system monitoring
- Time proven cast iron design for durability and reliability
- Optimum venting flexibility for homes with existing chimneys
- Lifetime limited warranty
- Optional 5 or 10-year parts & limited labor warranty
- Extended Boiler Warranty Plans are administered by CornerStone United, Inc.
ES2
The ES2 blends unmatched performance with long lasting durability and exclusive energy saving features. Designed as an optimal replacement boiler for millions of homes with existing chimneys, the ES2 achieves an 85% AFUE. At the heart of the ES2 is one of the most advanced cast iron heat exchangers in the industry, and a well-insulated heavy-duty steel base for longevity. Even the ES2’s control system is class leading. The IQ Boiler Control System allows the ES2 to be easily equipped with an optional energy saving control package that can achieve up to a 15-20% reduction in fuel consumption according to most studies.
- Natural or LP gas
- Exclusive IQ Control System platform
- Optional LCD touch screen for system monitoring
- Reliable, American-made cast iron heat exchanger
- Designed for homes with existing chimneys
- Industry standard tapping locations fit thousands of existing boiler installations
- Lifetime limited warranty
- Optional 5 or 10-year parts & limited labor warranty
- Extended Boiler Warranty Plans are administered by CornerStone United, Inc.