Hi Delta® Hydronic Boilers, 302C-902C

Full Input in BTUH
Flue Dia.
 H3-302C  300,000 5"
 H3-402C  399,000  6"
 H3-502C  500,000  6"
 H3-652C  650,000  8"
 H3-752C  750,000  8"
 H3-902C  900,000  8"

  • All models Indoor/Outdoor certified.
  • 84% Efficiency.
  • CAT I vertical venting, CAT III sidewall venting. No extractor required for sidewall applications up to 70ft on room air.
  • 2-Stage operation.
  • Patented burner "security blanket" enhances staged combustion, minimizes installation, start-up issues, and protects burners from metal fatigue.
  • 105ºF minimum inlet water temperature.
  • Cast-iron headers with copper finned tube heat exchanger.  Brass headers and cupro-nickel tubes available as options.  AB 1953 compliant.
  • Sidewall venting capable. No extractor needed for most applications.
  • Ducted combustion air ready. TruSeal® CSA-Certified direct-vent available.
  • VERSA IC® Control Package with LCD Display.
  • Status Display Lights. 
  • Cascade control of up to 4 units, no external sequencer required. 
  • Diagnostics Center with History, English, no codes. 
  • Modbus RTU BMS port (RS485). 
  • 0-10 VDC BMS Interface (Setpoint or Direct Drive).
  • Certified under SCAQMD Rule 1146.2. Meets all Low NOx regulations.
  • Available for natural gas or propane.