Hot Water Boilers

HOT WATER BOILERS

Precision hot water boilers deliver the performance and reliability that system design engineers and facility owners demand. Our standard models are designed and fabricated to strict industry standards with a complete trim package to meet a wide variety of requirements and range of applications. For unique installations, Precision offers unique solutions including more sophisticated control options and special trim components to provide a distinct customized solution. Precision offers both electric (PCW and HW series) and fuel-fired (FTH and FPH series) boiler designs. Our hot water boilers are commonly used for hydronic heating in the following applications: K-12 school buildings, college and university buildings, dorms, hospitals, office buildings, government buildings, etc.

Commercial | HVAC/R | Health Care

PCW Compact Hot Water Boiler

Capacities: 50 MBH to 1,500 MBH (1.5 BHP to 44 BHP) @ 99.5% efficiency
Standard Model: ASME Section IV “H” Stamp (160 PSI & 250oF)
Compliances: UL Subject 834, NEC/NFPA Article 424-G, ASME Safety Code CSD-1

Developed specifically to fit through a 30” door, the standard PCW’s compact footprint can fit where a fuel-fired boiler cannot. When extra options require a larger cabinet, Precision can customize the assembly to supply the boiler in a ‘knock-down’ condition to preserve the design advantages that make the PCW ideal for retrofits, or where venting a fuel fired boiler is not an option.

The PCW can be configured to communicate with any building management system. Adding an SCR to the control package provides near infinite modulation. Other options include an integral main power disconnect to meet NEC code for resistance heating equipment, and construction under ASME Section I/VIII for high temperature
hot water applications.

  • All standard models fit through a 30-inch doorway with ease
  • Each heating element is fitted with its own 2-1/2” square mounting flange, installed in the head of the vessel to simplify maintenance and reduce downtime
  • Step Circuit Enable/Disable switches make it easy to limit boiler’s maximum firing rate when other higher priority electric loads are peaking
  • Optional SCR added to the boiler control package delivers 100:1 turndown to precisely follow heating load while minimizing energy usage
  • Requires no vent stack, breeching, or combustion air louvers—reducing total installation costs and speeding up completion
  • Available with BACnet and MODbus communications for remote control and monitoring

O&M Manual  | Spec Material

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HW Hot Water Boiler

Capacities: 1,638 MBH to 8,735 MBH (48 BHP to 260 BHP) @ 99.5% efficiency
Standard Model: ASME Section IV “H” Stamp (160 PSI & 250oF)
Compliances: UL Subject 834, NEC/NFPA Article 424-G, ASME Safety Code CSD-1

Nearly identical in design and operation to the PCW, but in a larger footprint to deliver higher heating capacity utilizing a horizontal vessel configuration. Like the PCW, standard models can be customized to meet unique installation and control requirements. It can be installed where venting a fuel-fired boiler is not an option. The HW can be configured to communicate with any building management system.

All standard models can be supplied with optional trim and controls to enhance performance. For example, an SCR will deliver near infinite modulation for precise load following. Other options include an integral main power disconnect to meet NEC code for resistance heating equipment, and construction under ASME Section I/VIII for high temperature hot water applications.

  • Fits even where access is limited—custom models can be supplied in a ‘knock-down’ condition
  • Each heating element is fitted with its own 2-1/2” square mounting flange, installed in the head of the vessel to simplify maintenance and reduce downtime
  • Step Circuit Enable/Disable switches make it easy to limit boiler’s maximum firing rate when other higher priority electric loads are peaking
  • Optional SCR added to the boiler control package delivers 100:1 turndown to  precisely follow heating load while minimizing energy usage and near infinite modulation
  • Requires no vent stack, breeching, or combustion air louvers—reducing total installation costs and speeding up completion
  • Available with BACnet and MODbus communications for remote control and monitoring

O&M Manual Spec Material

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FPH Vertical Firetube Hot Water Boiler

Capacities: 330 MBH to 4,100 MBH (9.5 BHP to 120 BHP) @ up to 86% efficiency
Standard Model: ASME Section IV “H” Stamp (160 PSI & 250oF)
Compliances: UL Subject 795/726/2096, ASME Safety Code CSD-1

Traditional vertically configured fire-tube design with better overall efficiency due to under-fired power burner. In addition to the simplicity of the 4-piece design, the FPH includes many advantages over other vertical configured boilers. For example, its larger water volume results in both a low pressure drop thru the unit and reduced cycling, to improve overall efficiency.

The FPH fits even where access is limited and offers easy installation and servicing. It can be configured to communicate with any building management system. Other available options include construction under ASME Section I/VIII for high temperature
hot water applications.

  • Single Pass heat transfer area sized at 4 sq. ft. per BHP
  • Simple 4-piece design (combustion chamber, pressure vessel, combustion gas collector with flue, and cabinet) can be supplied in a ‘knock-down’ condition to fit
    where access is limited
  • Available in low NOx configurations as low as sub-9ppm

O&M Manual | Spec Material

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FTH Flexible Water Tube Hot Water Boiler

Capacities: 860 MBH to 17,220 MBH (25 BHP to 500 BHP) up to 86% efficiency
Standard Model: ASME Section IV “H” Stamp (160 PSI & 250oF)
Compliances: UL Subject 795/726/2096, ASME Safety Code CSD-1

Flex-tube forced draft design offers high fuel-to-output efficiency in a compact, maintenance-friendly design that harnesses natural heat convection to ensure consistent internal heat distribution and complete internal water circulation. Noted for their small footprint compared to a horizontal fire-tube, the FTH accommodates up to 150oF temperature differences from the supply and return, and offers virtually instantaneous hot water. The FTH can be configured to communicate with any building management system. Other available options include construction under ASME Section I/VIII for high temperature hot water applications.

  • Individual carbon steel tubes bent into a serpentine configuration connect the lower return water vessel to the upper supply water vessel to form a five-pass heat transfer space that provides approx. 5 sq. ft. of heating surface per BHP
  • A single down-comer connects the upper and lower vessels outside the boiler cabinet to optimize natural internal convection and ensure positive water circulation through the heating tubes, resulting in a pressure vessel that accommodates up to 150oF temperature rise between supply and return to deliver hot water almost instantaneously without the risk of thermal shock
  • FTH-1/2/3 Series boilers are configured with tangent water walls on three sides of the combustion chamber requiring tube removal clearance on only one side of the boiler
  • FTH-4/5/6 series boilers are configured with tangent water walls on four sides of the combustion chamber requiring tube removal clearance on both sides of the boiler
  • All models can be supplied in a ‘knock-down’ condition to fit where access is limited, then reassembled with NO on-site code welding required
  • Available in low NOx configurations as low as sub-9ppm
  • 25-year warranty protecting the vessel against thermal shock

O&M Manual | Spec Material

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