Weil Mclain 383500702

383-500-702 Ultra 105 Natural Gas Ultra Efficient Condensing Gas Boiler

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Weil Mclain 383500702

Weil Mclain 383-500-702 Ultra 105 Natural Gas Ultra Efficient Condensing Gas Boiler
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Quick Specs:
Brand: Weil Mclain
SKU: 383500702
UPC: 672619185937
Stock Id: SID229518
Fuel Type: Natural Gas
Width: 22-5/8"
Height: 41-1/8"
Depth: 19"
Energy Star: No
Technical Details
Application: Heating
System Type: Hydronic (water)
Brand: Weil Mclain
BTU Output: 81000.0
BTU Input: 105000
Vent Size: 3"
Water Connection: 1"
Gas Connection: 1/2"
Boiler Type: High Efficiency

Weil McLain Ultra UG-105-S3-UE, Natural Gas Series 3 High Efficiency Condensing Hot Water Residential boilers feature AFUE efficiency up to 95.3% . These are some of the highest efficiencies in the industry, however, Ultra Series boilers, when used in common low temperature applications have annual efficiencies of 98.0%. Besides being Ultra High Efficient, the Ultra boiler is environmentally friendly.


Weil Mclain Ultra 105 Natural Gas Ultra Efficient Condensing Gas Boiler 383-500-702 with Taco Pump 007.


  • Series 3 Ultra Boiler
  • 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.


  • Fuel Type: Natural Gas
  • System Type: Hydronic (Water)
  • Features: EI/Spark Ignition/Direct Vent/Condensing
  • Vent Size: 3"
  • Water Connection: 1"
  • Gas Connection: 1/2"
  • BTU Input: 105000
  • BTU Output: 81000.0
  • Warranty: Limited 15 Year Warranty on Heat Exchanger/ 1-year on parts
  • Boiler Type: High Efficiency
  • Width: 22-5/8"
  • Height: 41-1/8"
  • Application: Heating
  • Depth: 19"
  • Vent Type: ABS

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From: Brooklyn, NY

Overall Rating: 4.0

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Verified Owner
Pros: Save on fuel costs, high satisfaction, minimal upkeep.
"Weil Mclain Gas Boilers were well reviewed online. The consensus seems to be that its quiet, very efficient, and does a great job heating even older houses. " Will Recommend: Yes
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