Weil-McLain Ultra Series 4 399,000 BTU Condensing Gas Boiler

Weil-McLain SKU: W383500738

Ready to Ship - Average Delivery Time of 1.85 Days

Weil-McLain Ultra Series 4 399,000 BTU Condensing Gas Boiler

  • 2.1 Gallon Boiler Water Volume
  • 91.7% AFUE
  • 4" Vent Size
  • AHRI Certified

Save $2,505.49

Retail price:Wholesale price:
Wholesale price$11,167.49 Sale price$8,662.00

As low as $214.38 per month


Weil-McLain is a leading North American Brand of hydronic comfort heating systems for residential, commercial and institutional buildings, since 1881. Contractors, engineers, architects, homeowners, and facility managers alike rely on Weil-McLain boilers for their comfort heating needs. Installed in homes, offices, schools, restaurants, hotels, and other facilities throughout North America, the Weil-McLain brand is among the most trusted and often used in the building industry.


  • Cast aluminum coated heat exchanger
  • 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 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


In residential installations, this unit comes with a 12-year heat exchanger and 5-year parts limited manufacturer's warranty when the boiler is registered with Weil McLain. For commercial installations, this unit comes with a 10-year heat exchanger and 1-year parts limited manufactuer's warranty.


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