Ultra 155 - 123,000 BTU Output High Efficiency Boiler (Nat Gas or LP) Zoom

Ultra 155 - 123,000 BTU Output High Efficiency Boiler (Nat Gas or LP)


Brand: Weil Mclain

Weil Mclain
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In Stock! Ships in 24-48 Hours
(6 Available)


Fuel Type: Propane
Natural Gas
System Type: Hydronic (Water)
Features: Direct Vent
EI/Spark Ignition
Vent Size: 3"
Water Connection: 1"
Gas Connection: 1/2"
BTU Input: 155000
DOE Rating:
IBR Rating:
Warranty: Limited 15 Year Warranty on Heat Exchanger/ 1-year on parts
Depth (Inches): 19-15/16"
Height (Inches): 43-1/16"
Width (Inches): 22-13/16"
Vent Type: Direct Vent
Boiler Type: High Efficiency

Description for Weil Mclain 383-500-723

Series 3 Ultra CT Boilers

Note: Product Title reflects this boiler's IBR Net Output Rating

Key Features

  • Gas fired water boiler with cast aluminum heat exchanger
  • Venturi mixing body mixes air and gas providing higher efficiency
  • Designed to operate in low temperature condensing applications
  • Outdoor reset and domestic hot water priority standard
  • Negative regulated gas valve precisely delivers gas to the boiler
  • Electronic control module automatically adjusts blower speed and gas flow rate in response to environment
  • Modulates with 5 to 1 turndown ratio
  • Variable speed motor matches combustion output to heating needs
  • High grade stainless steel burner features quiet operation, high efficiency, and cleaner combustion for low NOx applications.
  • Propane Conversion Orifice included for LP Gas Applications

We carry two manifold options that can speed up installation of the primary/secondary piping required on Ultra boilers. Webstone's Ultra Component kit works with a Hydro-Core manifold and minimizes height added to the boiler. Weil-McLain's Easy-Up manifold kit is designed by the boiler manufacturer and provides the added feature of optional indirect water heater connections.

Easy-up Manifold Installation Options:

Hydro-Core Near Boiler Installation Options::
  • FT-2R45 1" Ultra Component Kit

    PLEASE NOTE: The product weighs 234 lbs. and may require the use of a
    lift gate.
    If you do require a lift gate at your delivery, you'll have the option to add this FREE of charge when you checkout.

Ultra 155 - 123,000 BTU Output High Efficiency Boiler (Nat Gas or LP)

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