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’s proven design combines full modulation control and forced draft advances with time-tested scale resistant construction. This Direct Water Heater is the 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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