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ASME Heater
Product Description

Hayward Commercial Pool's Universal H-Series ASME gas heaters are designed and certified for commercial use. The flagship of our H-Series line encompasses high-end features and construction materials as standard. They combine industry-leading hydraulics, exceptional performance, energy efficiency and reliability, with planet-friendly low-NOx emmissions. Flexible connection options make them ideal for new or existing applications. Choose from 250,000 and 400,000 BTU natural gas or propane models.

  • Patented Cupro Nickle Finn Plate™ heat exchanger with bronze header as standard
  • Independent left or right side electric, water and gas connections
  • 2in x 2 1/2in CPVC flanged connections
  • ASME pressure relief valve included as standard
  • Electronic lock-out feature prevents unauthorized access to configuration settings
  • Easy installation and service via access of single front panel
  • Easy gas valve adjustment
  • Easy dual voltage conversion with fuse-protected circuit boards
  • Texas Heater Kits Available
  • New Warranty - 3 Years Parts and Labor

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Technical Specifications and Performance Data

Model BTU Description Pipe Size Max. Allowed Working Pressure Dimensions (L x W x H)
H250FDNASME 250,000 Natural Gas 2" x 2.5" 50 PSI 28" x 29.5" x 24"
H250FDPASME 250,000 Propane 2" x 2.5" 50 PSI 28" x 29.5" x 24"
H400FDNASME 400,000 Natural Gas 2" x 2.5" 50 PSI 36.5" x 29.5" x 24"
H400FDPASME 400,000 Propane 2" x 2.5" 50 PSI 36.5" x 29.5" x 24"




  • Can be used on all commercial pools and spas



THK - Kit-Temp / Pressure and Flow Switch
THK - Flow Switch Only

Item #UHXFSW1930