High Efficiency / Low Emissions Boiler Systems
Accardi Companies utilizes the most trusted names in the boiler industry.
Patterson Kelley
When it comes to efficient, economical, state-of-the-art solutions to a myriad of heat transfer challenges, those in the know trust Patterson Kelley. PK has been pioneering and providing forward-looking heat transfer products since 1880. With over 125 years of industry experience, you can be sure PK knows how to build rugged, dependable, uncomplicated boilers and water heaters that will save you money and perform reliably over the long haul. Patterson Kelley’s commitments to quality and thoughtful, innovative solutions for today’s and tomorrow’s heat transfer challenges have earned PK a solid reputation.
Patterson-Kelley is an internationally recognized market leader and major producer of heat transfer equipment, including hot water boilers and water heaters for institutional and commercial building applications such as schools, office and apartment buildings, dormitories, hospitals and hotels. The PK line of precision equipment for batch and continuous powder blending, batch drying, granulation and laboratory powder mixers and blenders also make our company a leading process solutions provider to the pharmaceutical, chemical and food-processing industries.
With over 125 years' experience and an innovative R&D pipeline, PK is highly regarded for bringing value-added solutions to the marketplace. PK hot water boilers, the mainstay of our company, are sold in the NAFTA market. PK’s heat transfer equipment is consistently specified by knowledgeable architects, engineers and contractors for a wide range of installations – from high profile projects like the White House and the Mayo Clinic to small users. They know our cutting edge technology is backed by sound engineering to produce rugged, dependable, highly efficient boilers and water heaters.
PK’s manufacturing plant, Customer Service Lab and company headquarters are in East Stroudsburg, PA. We also maintain a fully functional heat transfer training lab, providing hands-on training on actual equipment, for over 5,000 technicians and service contractors over the past ten years. Our process equipment group operates a Research and Development/Customer Test Lab supervised by a Ph.D. and professional engineer assisted by trained technicians. Our test results are guaranteed.
AJAX Boiler
Ajax Boiler, Inc. designs and manufactures a comprehensive line of boiler and commercial water heating products. With over eight decades of experience, the company offers high quality, heavy duty products with reputations for reliability, serviceability, and cost effective operation.
The administrative offices and manufacturing facility of Ajax Boiler, Inc. are located in Santa Ana, California. All products are designed and engineered by our in-house engineering department. Their experience and expertise combine the disciplines of combustion and heat transfer technology, pressure vessel design, control and systems engineering, and computer aided drafting. Our on-site R&D facility has the capacity to test fire boilers up to 21,000,000 BTU/hour under load conditions with calibrated test equipment that meet all UL certification testing requirements. All of the company’s products are manufactured in a 120,000 square foot, high bay, heavy crane way facility.
The company currently offers three distinct product lines; the Ajax Series for the commercial boiler market, the Ace Series for the water heating market, and the Atlas Series for the high-efficiency, condensing boiler and water heating markets.
Miura Boiler
Miura Boiler was founded in Japan in 1927 and has grown to be one of the largest boiler manufacturers in the world. Miura is known worldwide for our commitment to protecting the environment and our innovative and efficient boiler designs. Our LOW NOx steam and hot water boilers meet and exceed current and proposed regulations for nitrous oxide emissions levels, as low as 20ppm NOx at 3%, corrected O2 Miura Company, Ltd. began North American activities in 1988 when they established the manufacturing plant in Brantford, Ontario. Their engineering department developed procedures to meet ASME codes and listing approval from IRI/FM, UL, and recently a pre-approval for the SCAQMD (Southern California Air Quality Management District). The United States corporate sales office, Miura Boiler USA, Inc., was established and it has established relationships with national, state and city inspectors and agencies.
The boiler system features a compact unit with a low-water content, and is often installed in a multiple boiler network. Miura Boilers and the MI Panel allow appropriate horsepower to be brought on and off line quickly to meet sophisticated production needs with maximum economy. The 35-year, field proven "Miura Advantage" is the ability to reach full output steam from cold start in less than five minutes using the least amount of energy and having the lowest environmental impact.
In 1989, Miura introduced its revolutionary Low NOx design, which exceeds any current or proposed SCAQMD environmental regulations. This is a true Low NOx design (20 ppm, lower NOx available for SCAQMD-please call for details), which does not rely on cumbersome flue gas re-circulation methods. Additionally, a completely packaged 200HP, Low NOx steam generator can be moved through a standard 3' x 7' doorway. The Miura Boiler is designed to run with a minimum amount of maintenance and simple, push-button controls. Operation is quiet, radiant heat losses are minimal, and steam quality is second to none. The high efficiency Miura Boiler has won numerous awards from Engineering Societies and Gas Associations for its compact, safe, cost-effective design.
Non Condensing Hot Water
For old or new systems, buildings with existing steel or masonry chimneys or systems that require higher temperature water for most or all operating hours, Accardi offers the industry’s most innovative non-condensing boilers. All boilers in this category are built with time-tested heat exchanger and carry our industry-leading warranties.
Products by Patterson Kelley:
PK Thermific® Boilers
When it comes to small size, big output, PK’s Thermific® Gas-Fired Hot Water Boiler is hard to beat. So compact that even the largest models can be moved through a 30” doorway; the Thermific also delivers one of the highest thermal efficiency level that a non-condensing, gas-fired boiler can achieve.
PK Modu-Fire® FD Boiler
If your new construction, replacement or retro-fit project calls for a non-condensing boiler, PK has the solution plus a quick return on your investment. Our reliable, full-modulation Modu-Fire® FD boiler is the ultimate non-condensing boiler with high efficiencies and high heat transfer ratios leading to lower operating costs and lower fuel bills.
PK Gemini® Selectable Propane/Natural Gas Hot Water Boiler
PK was the first copper boiler manufacturer to offer combined propane/natural gas technology. PK’s Gemini® dual-fuel boiler with computerized fuel changeover capabilities lets you take advantage of interruptible gas service discounts where offered by local gas companies, so you save on fuel costs and receive a fast return on your investment.
PK Weathermaster® Outdoor Boiler
PK’s Weathermaster® outdoor boilers stand up to the toughest of outdoor conditions, operating in ambient temperatures as low as minus 20° F. If space is at a premium in your facility, you can install these boilers outside and avoid the expense and trouble of constructing any additional mechanical room space.
Products by AJAX Boiler:
WRN & WRF Inclined Water Tube Boilers
The AJAX WRN atmospheric and WRF forced draft hot water boilers feature capacities up to 21,000 MBTU/hr. Units are ASME Boiler and Pressure Vessel Code Section IV stamped for 125 psig maximum allowable working pressure (MAWP). Both units are built with a floating head design that eliminates thermal shock and give full access to the combustion chamber and water sections.
Near Condensing Boilers “WC” Series
The Ajax WC series - near condensing steel boilers- deliver a powerful performance with consistent <9 ppm emissions for NO, NOx, and CO. The units can be delivered with the Ajax Managment System (AMS), which has the Smart Boiler Control System™ built into it, ready for remote monitoring and analysis.
These units give you the rugged “bullet-proof” quality Ajax has built its reputation on, while delivering up to 86% Thermal Efficiency with a 6:1 turndown ratio.
Products by Miura Boiler:
LXW Miura Gas/Low N0x Hot Water Boiler 50 hp to 175 hp Modules
Miura's Low NOx Hot-Water Boiler utilizes a flat shaped burner and rectangular shaped boiler vessel uniquely designed for the LXW.
- - Typically only one-third the footprint of conventional firetube boilers
- - Low NOx gas burner with “Quenched flame”
- - Up to 200HP per boiler
EXW Miura Gas/Oil Hot Water Boiler 100 hp to 300 hp Modules
Miura's Gas/Oil hot-water boiler is a low water content, water tube design, which provides full output within 5 minutes.
- - Gas/Oil dual fuel burner
- - Up to 300 BHP per boiler
Condensing Hot Water
Accardi offers the industry’s most innovative condensing hydronic boilers. All boilers in this category are built with time-tested heat exchangers and burners and carry our industry-leading warranties. For older or new systems, that can support condensing technology, hydronic systems that achieve the highest efficiency in the industry.
Products by Patterson Kelley:

PK MACH® Boilers
Demand for green building solutions is greater than ever as building owners look to minimize their building’s carbon footprint and optimize energy use to decrease costs. At Harsco Industrial Patterson-Kelley, we are committed to providing green technology and innovation that help you, our customer, meet your sustainable development goals. That is why we continue to develop advanced heating solutions like the new MACH® C3000 condensing boiler.
Equipped with an aluminum heat exchanger and the exclusive ENVI® control, the MACH® C3000 condensing boiler produces 3 million BTU input at 95% CSA certified efficiency. With a thermal efficiency up to 99%, Harsco customers save 25% or more on fuel costs with the MACH® C3000 boiler. In addition to cost savings, the MACH® C3000 helps accumulate LEED® points in Energy Atmosphere by decreasing your energy usage compared to the energy baseline of your existing boiler plant. Take advantage of federal, state and utility rebates where applicable to recover a portion of your initial investment cost.
Low greenhouse gas emissions are a standard feature on all Harsco MACH® boilers, and the MACH® C3000 condensing boiler is no exception. Achieve 10ppm NOx emissions or less across all firing rates of the boiler.
Ideal for both retrofit and new construction, the MACH® C3000 condensing boiler has a relatively small footprint and lightweight design to reduce installation costs. A 32 inch width allows the MACH® C3000 boiler to fit through most doorways.
Products by Ajax Boiler:

Atlas Series: High Efficiency Condensing Boilers
Over the past several years, the Atlas product team has developed the flagship Atlas Series condensing boiler. Throughout the process, they have studied the marketplace, listened to the needs of end users, and sought valuable input from representatives. The results are impressive!
The Atlas Series boiler combines solid engineering and innovative design with the highest quality components in the industry. With a thermal efficiency of 98%, fully modulated up to 7.5:1 turndown, and a sealed combustion chamber, the Atlas Series boilers offer feature rich, high performance, low NOx operation.
The Atlas Series condensing boiler is now available in 7 models with a variety of options and upgrades. Please contact The Accardi Companies for complete product specifications, product literature, and technical documentation.
FEATURES:
- - 98% thermal efficiency
- - Up to 7.5 to 1 turndown
- - Fully modulating PID controller
- - Zero-clearance installation sides & top
- - Brushed aluminum steel & enameled jacket
- - Clip-on panels for easy access
- - Front removable coil assembly for easy serviceability
- - Single pass coil construction allows for complete deliming
- - Sealed combustion chamber for increased efficiency and reduce emissions
- - ETL listed to UL 795 and CAN1-3.1
- - CSD-1 compliant (IRI and FM optional)
Steam Boilers
Accardi offers the industry’s most innovative non-condensing steam boilers. All boilers in this category are built with time-tested heat exchangers and burners and carry our industry-leading warranties. For older or new systems, buildings that have large thermal risers and cannot support hydronic heat or have existing steel or masonry chimneys, systems that require steam for most or all operating hours. Low pressure or high pressure steam configurations are available.
Products by Ajax Boiler:
H” series and “S” series Steam Boilers
Inclined tubes provide uniform heat transfer, resulting in high fuel economy and long boiler life. 2″ O.D. tubes (steel or copper) are rolled into large headers on both ends producing excellent boiler circulation. 2″ O.D. tubes are less restrictive than smaller O.D. tubes. Our non-proprietary tubes are less costly for tube replacement. Ajax’s straight tube design allows for easy inspection of tube conditions. Full access to water sections, steam drum and combustion chamber, all models are ETL listed for natural gas or propane. ETL listed outdoor models available for non-freezing applications.
| Product Type |
Combustion System |
Max. Allowable Working Pressure PSIG |
ASME Code Section |
Drum |
Model Series |
Size Range Input (BHP) |
| Low Pressure Steam |
Atmospheric |
15 |
IV |
Yes |
HRN |
6-300 |
| Forced Draft |
15 |
IV |
Yes |
HRN |
6-300 |
| High Pressure Steam |
Atmospheric |
150 |
I |
Yes |
SRN |
6-300 |
| Forced Draft |
150 |
I |
Yes |
SRN |
6-300 |
Products by Miura Boiler:

LX Gas/Low N0x Series Low pressure steam and high pressure steam boiler system.
The MIURA Super LX Series deign consists of rows of vertical tubes sandwiched between two rectangular headers. Both headers are encased in a castable refractory with only the tubes exposed to flame and/or combustion gases. The upper header is attached to the lower header only by the tubes; as the tubes expand and contract, the headers float up and down accordingly. This “floating header” concept greatly reduces stress and eliminates the “leaky tube” problems associated with firetube and bent watertube designs. This design is the cornerstone of boiler fuel savings with full steam output within five minutes from a cold start. Turning boilers on and off as needed – only when needed – results in the highest in-service efficiency for industrial steam use and is magnified with multiple installations. MIURA truly sets new standards in Boiler Technology. FULL STEAM OUTPUT WITHIN FIVE MINUTES!
Packaged Systems/Accessories
Accardi Companies provides powerful and innovative tools. Our hybrid boiler systems and boiler-room in a box program utilize both condensing and non-condensing boilers in the same boiler room depending on the most effective configuration for your application. The system can be designed with domestic capabilities, electrical power generation capabilities, absorption cooling, secondary piping and pumping, custom enclosures, zone control and state of the art automation sensors and control for your needs. Our customers often save 50% or more on fuel and 30% or more on installation costs. Hybrid systems make saving energy and “going green” practical and affordable. Now you can buy not just a boiler, but the entire “boiler system in a box.” All of the system components – from pumps to controls to chimneys – are engineered to work together, and are factory skid mounted to produce superior performance in the field. These factory packaged system skids offer economy, control over quality of installation, and single source responsibility.