High Efficiency Commercial Heating for Plumbing Professionals
Engineered solutions for heating, hot water, and gas systems—designed to streamline your job and exceed code.
Commercial Plumbing Solutions:
🔥 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

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
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.