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Ultra S4 Gas Boiler

  • Cast aluminum coated heat exchanger
  • Up to 94% DOE AFUE efficiency
  • Designed to operate in low temperature condensing applications
  • Outdoor reset and domestic hot water priority
  • Modulates with 5:1 turn-down ratio
  • High grade stainless steel burner features quiet operation
  • U-Control gives you the power for easy set-up and maintenance:
    • Multiple set-up and zone options
    • System sensing recognizes system and outdoor temperatures
    • Temperature management for up to three different set-points
    • Control multiple boilers from a single control panel
    • Standard screen messages provide service alerts and maintenance reminders

Technical Data

Model AFUE (%) CSA Input (MBH) Net (MBH) DOE Heating Cap. (MBH) Vent Size (in.)
UG- 80 93.5 80 62 71 2" or 3"
UG-105 94 105 82 94 2" or 3"
UG-155 94 155 121 139 3"
UG-230 94.1 230 180 207 3" or 4"
UG-299 92.5 299 235 270 4"
UG-399 91.7* 399 317 364* 4"