Models: W750, W1000, W1500, W2000

P-K MODU-FIRE® FD Direct Water Heating system adds a new dimension of versatility to gas water heating for commercial, industrial, and institutional buildings.

The new W-Series Water Heaters are built in compliance with ASME Section IV stamp and ANSI Z21.10.3-2013/CSA 4.3-2013 standards.

The P-K MODU-FIRE® FD W Series’ proven design combines full modulation control and forced draft advances with time-tested scale-resistant construction. This direct water heater is the most reliable choice for your supply of hot water. Engineered for numerous years of efficient and dependable operation, its scale-resistant components include industry preferred glass-lined heads and nickel-plated tube sheets.

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NURO® Touch-Screen Control System

Turndown energy usage

MODU-FIRE® FD W-Series commercial water heaters are equipped with the most intuitive interface in the industry, the NURO® Touch-Screen Control. Designed to maximize efficiency, the NURO® Control System monitors and modulates the combustion and ignition of the boiler to maintain the desired outlet temperature.


  • Small, modular configuration
  • Changes both fuel and air at a constant ratio to match boiler output to actual heat demand
  • Smooth 5:1 turndown can track varying loads down to 20% of rated capacity
  • Dynamic air density compensation
  • Eliminates short cycling in high T variable speed pumping systems
  • Accurate firing rate feedback analog output signal proportional to firing rate
  • Small diameter Category IV venting
  • Easy service construction
  • Fire tested before shipment


  • Simplified, low-cost installation
  • Clean, efficient combustion across entire firing range of the boiler
  • Maximum small load efficiencies
  • Captures up to $0.85 of every fuel dollar
  • Perfect part-load performer
  • Easy to inspect and maintain; can be disassembled and reassembled in minutes

Contact us to learn more about the Patterson-Kelley difference.

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