High Efficiency Commercial Heating for Plumbing Professionals

Engineered solutions for heating, hot water, and gas systems—designed to streamline your job and exceed code.

🔥 Condensing Water Heating Systems

Condensing systems from Accardi offer unmatched thermal efficiency and compact performance for domestic hot water and comfort heating needs in commercial and institutional buildings. 

Hospitals

Schools

Commercial Buildings

Apartment Buildings

Patterson-Kelley

MACH n’ ROLL

300–1050 MBH | 95% Efficiency

  • Compact DHW/comfort heating system 
  • Ideal for tight spaces and retrofits 
  • Wall-mount capable 
  • Built-in reliability and low NOx emissions 

Patterson-Kelley

HiDRA

800–1000 MBH | Up to 99% Efficiency

  • Integrated 128-gallon domestic hot water storage 
  • High-recovery, ultra-efficient hybrid system 
  • Plug-and-play configuration for fast install 
  • Top-tier energy savings 
P-K Solis® commercial condensing boiler with compact vertical firetube design

Patterson-Kelley

SOLIS

650–3000 MBH | 96% Efficiency

  • High-output condensing boiler 
  • Flexible for scalable plant room designs 
  • Low maintenance with easy service access 
  • Smart controls for optimized energy management 

Patterson-Kelley

SONIC

650–3000 MBH | 94% Efficiency

  • Ultra-quiet performance 
  • Compact footprint for design-constrained mechanical rooms 
  • Integrated controls and diagnostics 
  • ASME-rated for commercial compliance 

We Engineer It. You Approve It.

From heat load calculations to complete system design, we handle the heavy lifting—so your team can move faster. Accardi delivers submittal-ready packages that engineers can sign off on with confidence. 

Non-Condensing Boilers

Designed for durability and ease of service, our non-condensing boilers are trusted across legacy buildings and commercial heating upgrades where rugged simplicity is key.

Boiler REPLACEMENTS

SIMPLE HOT WATER LOOPS

HIGH DEMAND MECHANICAL ROOMS

Patterson-Kelley

MODU FIRE

750–2000 MBH | 85.8% Efficiency

  • Modular firing for precise load tracking 
  • Flexible design with redundant burner arrays 
  • Simplifies staging in multi-unit installations 
  • Proven reliability for over 20 years 

Patterson-Kelley

VELOX

750–2000 MBH | 85.8% Efficiency

  • Efficient atmospheric design 
  • Minimal electrical and control complexity 
  • Ideal for cost-sensitive upgrades 
  • Trusted for its long lifespan and stability 

💧 Water Heaters

Gas-Fired Commercial Systems

Accardi’s commercial water heaters offer reliable hot water for high-occupancy and high-consumption environments with consistent delivery and thermal stability.

Use Cases: 
Multifamily, hotels, dormitories, rec centers, dining and foodservice 

Benefits: 

  • Gas-fired durability with fast recovery rates 
  • Configurable to match recirculation systems 
  • Minimal maintenance needs 
  • Built for long-term uptime in high-use environments 

️ ♨ Heat Exchangers

We offer compact, high-performance heat exchangers for indirect domestic water heating and process integration. Ideal for steam-to-water and water-to-water applications.

Mechanical rooms

DHW storage loops

steam plant conversions

radiant systems

Patterson-Kelley

DURATION

Braze Plate, Water-to-Water | Up to 85 GPM

  • Space-saving design 
  • Corrosion-resistant construction 
  • Efficient DHW production 
  • Excellent for apartments and modular buildings 

Patterson-Kelley

COMPACT

Steam-to-Water & Water-to-Water | Up to 420 GPM

  • Built for high-volume buildings 
  • Available with skid-mount packages 
  • Excellent energy transfer efficiency 
  • Ideal for schools, hospitals, and labs 

We Handle the Details.
You Focus on the Job

Avoid rework and RFIs. Accardi provides commercial water heating and boiler systems that arrive fully coordinated with your site requirements and install sequence.

Gas Systems

Accardi Integrated Components

From pressure stability to emergency shutoff, Accardi’s gas systems ensure safety, control, and uninterrupted fuel delivery to mechanical systems. 

Use Cases: 
New gas infrastructure, pressure drops, energy plant upgrades, LL-152 compliance

Systems Include: 

  • Gas Boosters – Maintain pressure under peak load 
  • Gas Regulators – Keep downstream pressure stable and code compliant 
  • Gas Shut-off Valves – Fail-safe control for emergency response 
  • Safety Monitoring Systems – Real-time alerts, control integration 

️Heat Trace & Freeze Protection

Thermon

Protect exposed piping and maintain thermal consistency in critical applications. Our heat trace systems prevent damage and ensure code compliance even in extreme conditions. 

Use Cases: 
Roof drains, mechanical risers, outdoor valves, hydrants, and garage ramps 

Benefits: 

  • Pipe freeze protection for exposed or buried lines 
  • Hot water temperature maintenance for long runs 
  • Automated snow melt systems for ramps and entrances 
  • Remote monitoring for preventative control 

Aftermarket Services / Support

Maximize system uptime and keep your installation compliant with local law and energy codes. Our expert team provides full-service support across all installed systems. 

Services Include: 

  • Routine Preventative Maintenance 
  • Local Law Compliance (LL-97 / LL-152) 
  • Boiler System Retrofits & Efficiency Upgrades 
  • Diagnostic Testing & Emergency Repair 

Customers Testimonials

The Velox-Retrofit™ allowed us to upgrade our heating system without the need for extensive venting modifications. It saved us time and money.
Mark D.
Building Owner
Installation was smooth, and the performance boost is noticeable. A smart choice for retrofits.
Susan P.
Retrofit Contractor
Compliance was a major concern, but the Velox-Retrofit™ met all requirements effortlessly.
Kevin L.
Compliance Officer

Let’s Build the Right Plumbing System for Your Facility

Get a tailored solution, fast turnaround, and decades of commercial plumbing experience behind your project.