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Patterson-Kelley non-condensing commercial boiler installation by ICA Heating
Patterson-Kelley Authorized Dealer

Commercial Non-Condensing
Boilers

Patterson-Kelley's non-condensing boilers deliver proven reliability with time-tested copper heat exchangers — the right choice when system design calls for high return water temperatures, steam output, or cost-effective replacement of existing equipment.

3,000MBH Max Input
88%Thermal Efficiency
CopperHeat Exchanger
24/7Emergency Service
Request a QuoteCall (800) 994-6164
When Non-Condensing Is the Right Choice

Not Every Building Needs
a Condensing Boiler

Condensing boilers dominate the conversation — but they're not always the right answer. When system return water temperatures run above 130°F, condensing boilers can't reach their dew point and lose their efficiency advantage. In these applications, a well-engineered non-condensing boiler delivers the same reliable heating at lower first cost and reduced complexity.

Patterson-Kelley's non-condensing line is built around their time-tested copper finned-tube heat exchanger — proven across thousands of commercial installations over decades. The MODU-FIRE FD and THERMIFIC VELOX cover 750–3,000 MBH with options for hot water, steam, and sealed combustion.

ICA's engineers don't default to condensing when non-condensing is the right fit. We evaluate your system, return temperatures, and budget to recommend the most cost-effective solution — and then support it with factory-authorized installation and 24/7 lifecycle service.

High-Temp Systems
Optimized for return water above 130°F — cast iron radiators, baseboard systems, and steam applications where condensing can't deliver its efficiency premium.
Proven Copper Construction
P-K's copper finned-tube heat exchangers offer excellent thermal conductivity, field-proven durability, and straightforward service access.
Lower Total Cost
20–35% lower first cost than condensing, no condensate neutralization, and simplified venting — reducing both installation and operating complexity.
P-K Non-Condensing Boiler Line

Two Models. Proven
Performance.

The MODU-FIRE FD and THERMIFIC VELOX cover the full range of non-condensing commercial applications — from standard mechanical rooms to challenging negative-pressure environments.

Patterson-Kelley
P-K MODU-FIRE FD
Compact Modular Workhorse

The MODU-FIRE FD is Patterson-Kelley's flagship non-condensing boiler — a compact, modular design built around P-K's time-tested copper heat exchanger. Its forced-draft design eliminates short-cycling in high variable-speed pumping systems, making it ideal for multi-boiler plants where precise load matching is critical.

  • Capacity: 750–3,000 MBH input
  • Efficiency: Up to 88% thermal efficiency
  • Heat Exchanger: Time-tested copper finned-tube construction
  • Design: Forced-draft, modular — eliminates short-cycling
  • Configuration: Hot water or steam, multiple modules per unit
  • Controls: NURO touch-screen with BAS integration
Natural Gas / Liquid Propane
Patterson-Kelley
P-K THERMIFIC VELOX
Sealed Combustion for Challenging Spaces

The THERMIFIC VELOX features a sealed combustion design that eliminates the need for large combustion air louvers — permitting installation in negative-pressure environments where conventional boilers can't operate safely. Its copper heat exchanger delivers reliable, high-output performance for facilities with challenging mechanical room conditions.

  • Capacity: 750–2,000 MBH input
  • Efficiency: Up to 85% thermal efficiency
  • Heat Exchanger: Copper finned-tube with proven durability
  • Combustion: Sealed design — no combustion air louvers required
  • Installation: Suitable for negative-pressure mechanical rooms
  • Controls: NURO touch-screen with remote monitoring
Natural Gas / Liquid Propane
Need help selecting the right boiler?Our engineers will evaluate your facility and recommend the best fit.
Get a RecommendationCall (800) 994-6164
Condensing vs. Non-Condensing

The Right Boiler for
the Right Application

Non-Condensing
Best When
Return water temps above 130°F, existing non-condensing systems, steam applications, budget-sensitive projects, or mechanical rooms without condensate drains.
Condensing
Best When
Return water temps below 130°F, new construction with low-temp design, maximum efficiency is the priority, or green building certifications require it.
ICA Recommends
The Right Boiler for the Job
We don't push condensing when non-condensing is the right fit. Our engineers evaluate your system design, return temps, and budget to recommend the most cost-effective solution.
Non-Condensing Advantages

When Simplicity & Reliability
Are the Priority

Non-condensing boilers offer distinct advantages in the right applications — from lower cost and simpler installation to steam capability and retrofit compatibility.

High Return Water Temps
Non-condensing boilers are the right choice when system return water temperatures consistently run above 130°F — conditions where condensing boilers can't achieve their efficiency premium.
Proven Simplicity
Fewer components, no condensate neutralization, and no stainless steel corrosion concerns. Copper heat exchangers are field-proven, easy to inspect, and straightforward to service.
Lower First Cost
Non-condensing boilers typically cost 20–35% less than equivalent condensing units — making them the cost-effective choice when system design doesn't support condensing return temps.
No Condensate Drain Required
Unlike condensing boilers, non-condensing units don't produce acidic condensate — eliminating the need for condensate neutralization tanks, floor drains, and associated piping.
Retrofit Friendly
Drop-in replacements for existing non-condensing boilers with matching connections, similar footprints, and conventional venting — minimizing mechanical room modifications.
Steam & Hot Water
The MODU-FIRE FD can be configured for either hot water or steam applications — providing flexibility for facilities that need process steam or dual-purpose heating plants.
Applications

Trusted Across Every
Building Type

Non-condensing boilers remain the standard in thousands of commercial and institutional facilities — especially those with high-temperature distribution systems.

Office Buildings
High-temp perimeter heating
Hospitals & Healthcare
Steam & hot water systems
Schools & Universities
Existing radiator systems
Industrial Facilities
Process steam & space heat
Government Buildings
Budget-conscious replacements
Multi-Family Residential
Baseboard & radiator heat
Water Treatment Plants
High-reliability heating
Arenas & Convention Centers
High-output central plants
Frequently Asked Questions

Common Questions About
Non-Condensing Boilers

When should I choose a non-condensing boiler over a condensing boiler?
Non-condensing boilers are the right choice when your system return water temperature consistently stays above 130°F — which is common in older buildings with cast iron radiators, baseboard heating, or steam systems. In these applications, condensing boilers can't reach their advertised efficiency because the flue gases never cool below the dew point. A non-condensing boiler delivers reliable performance at lower first cost without the complexity of condensate management.
What makes the copper heat exchanger better for non-condensing applications?
Patterson-Kelley's copper finned-tube heat exchangers are time-tested across thousands of commercial installations. Copper offers excellent thermal conductivity for fast heat transfer, proven durability in non-condensing temperature ranges, and easy field inspection and repair. Unlike stainless steel (which is designed for condensing temperatures), copper performs optimally in the higher operating temperatures of non-condensing systems.
Can the THERMIFIC VELOX really be installed in a negative-pressure room?
Yes. The THERMIFIC VELOX features a fully sealed combustion system that draws combustion air through a dedicated intake — independent of the mechanical room environment. This eliminates the need for large combustion air louvers and allows safe installation in negative-pressure environments like underground mechanical rooms, retrofit spaces, or buildings with aggressive exhaust systems.
What capacity range do Patterson-Kelley non-condensing boilers cover?
The MODU-FIRE FD covers 750–3,000 MBH input and the THERMIFIC VELOX covers 750–2,000 MBH input. Both can be installed in multi-boiler configurations for larger plants. For capacities beyond 3,000 MBH, ICA can engineer solutions combining multiple P-K units or recommend alternative equipment from our other manufacturer partners.
Does ICA provide installation and service for non-condensing boilers?
Yes. ICA provides the complete lifecycle — from engineering and equipment selection through delivery, rigging coordination, startup, commissioning, and ongoing preventive maintenance. Our technicians are factory-trained on every current Patterson-Kelley model and carry OEM parts for fast service response.
Can ICA help me decide between condensing and non-condensing for my project?
Absolutely. Our engineers evaluate your system design, return water temperatures, building type, energy code requirements, and budget to recommend the most cost-effective solution. We don't default to condensing when non-condensing is the right fit — we match the equipment to the application.
Patterson-Kelley Non-Condensing Boilers
Need Help Selecting
the Right Boiler?
Request a QuoteCall (800) 994-6164