Weil-McLain 383500736
Weil-McLain 383500736
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Weil-McLain Ultra 230 - 207K BTU - 94.1% AFUE - Hot Water Gas Boiler - Direct Vent



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*This product qualifies for Free Shipping anywhere in the contiguous US. Accessories may ship separately. Items over 100lbs shipped via semi-truck, be sure to select "Lift Gate" to lower the product to the ground curbside. Remote area surcharges may apply, see our full shipping policy for more details.
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Weil-McLain Ultra 230 - 207K BTU - 94.1% AFUE - Hot Water Gas Boiler - Direct Vent
Weil-McLain Ultra 230 - 207K BTU - 94.1% AFUE - Hot Water Gas Boiler - Direct Vent
Model: 383500736
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Expert Recommended Accessories Selected by Ken, our Expert
Required Accessories 9
These accessories are required to properly setup/install this product.
Optional Accessories 10


    Over the last 130 years, Weil-McLain has built a reputation of designing some of the most reliable boilers in the marketplace. Their dedication to producing long-lasting heating solutions is seen in every boiler they make. Weil-McLain's Ultra hot water boiler is highly efficient, simple to install, and remarkably durable. The Ultra is a brilliant addition to any hydronic heating system, and the low profile means that it is easy to fit into even the smallest of spaces. Using condensing technology, the Ultra will reuse heat that escapes from conventional boilers, providing greater efficiency. Equipped with Weil-McLain's proprietary U-Control system, the Ultra is a very user-friendly boiler. Clear display screens relay information about operations, temperatures, and even the maintenance schedule and your contractor's contact information. With U-Control and a 94.1% AFUE, the Ultra 230 makes comfort and efficiency more accessible than ever before.
  • Nano-Coated Heat Exchanger
  • With a nano-coated heat exchanger, the Ultra boilers won't need cleaning for 5 years after installation. When it comes time to clean, simply rinse the exchanger with water and replace.
  • Outdoor Reset Control
  • An outdoor reset sensor is included with every Ultra boiler. This sensor, when paired with the U-Control system, allows your boiler temperature to be adjusted relative to the temperature outside, eliminating excess energy use and guaranteeing comfort.
  • Clean, Efficient Burner
  • The Ultra 230 has a stainless steel, modulating burner. Modulating burners scale heat production to your boiler's demand, further improving energy efficiency. A venturi mixing body combines gas and air prior to ignition for low NOx operations.
  • U-Control
  • Weil-McLain's U-Control makes it simple to set up even the most complex applications. Preset system configurations may be used right out of the box or customized to your liking. Multiple boilers can be staged together through the U-Control as well.
  • Advanced Condensate Management
  • The Ultra 230 incorporates polypropylene piping and nanotechnology coating, preventing condensate build-up and damage caused by acidic condensate penetration.
  • Easy Installation
  • Weil-McLain has included piping at the top and base of the unit to provide flexibility in how you install the Ultra. All electrical components come pre-wired, color-coded, and connected to the U-Control.
  • 5-Year Protection Plan*
  • This free protection plan covers parts and labor for any defective electronic or mechanical part furnished by Weil-McLain for up to five years from the installation date of your Ultra boiler.
  • Product Includes:
  • (1) Weil-McLain Ultra 230 Hot Water Boiler
  • (1) Taco 0014 Circulator
  • (1) Outdoor Temperature Sensor
  • (1) Natural Gas to Liquid Propane Conversion Kit
  • Product Note
    * To qualify for the 5-Year Protection Plan, registration must be completed within 30 days of your boiler installation. Please visit Weil-McLain's website at https://www.weil-mclain.com/product-registration for more details.
California residents see
WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov.
For more information go to: www.p65Warnings.ca.gov


specs product image PID-79378
Product Category
General Information
Product Line
Product Category
Medium Learn More
Medium refers to the substance that carries heat through the heating system. Systems are either designed to use either Hot Water or Steam as a medium, and components are usually specific to one or the other.
Hot Water
Fuel Type Learn More
Fuel Type
To create heat, some form of fuel is required. Fuel Type specifies what the product uses as an input to create heat.
Natural Gas
Combustion Type Learn More
Combustion Type
Condensing appliances use leftover thermal energy from combustion gases to heat water in a secondary heat exchanger, resulting in higher efficiency and lower exhaust temperature.
Vent Type Learn More
Vent Type
Products that use combustion (burning) of fuel to create heat also create potentially dangerous gasses that need to be exhausted (AKA "Vented"). Depending on the product, venting can be done via a chimney, through a side wall, or use a second vent to provide fresh air to the appliance.
Direct Vent
DHW Production Learn More
DHW Production
DHW (Domestic Hot Water) is potable water for uses other than space heat. Some boilers are able to provide DHW "out of the box", while others can do so with the purchase of optional accessories.
Modulating/Staging Learn More
Stages are unique speeds or levels that equipment can operate at. More stages allow for better fine-tuned control of output, which improves comfort and efficiency. Modulating equipment can operate across a range of levels, giving the highest level of fine-tuned control. Learn More
Mount Type
Minimum Altitude
0 Feet
Maximum Altitude
5500 Feet
Includes Pump
Assembly Type
Gas Conversion Kit
AFUE Learn More
AFUE (Annual Fuel Utilization Efficiency) measures the efficiency of combustion equipment over the entire heating season, and is calculated by dividing the amount of energy that is actually heating your home by the total energy contained in the fuel used by the boiler/furnace. Learn More
94 %
Maximum Input Capacity Learn More
Maximum Input Capacity
The Maximum Input Capacity describes how quickly the appliance will use fuel when delivering it's maximum capacity. The units may change depending on the fuel being used.
230000 BTU
Minimum Input Capacity
46000 BTU
DOE Heating Capacity Learn More
DOE Heating Capacity
Also referred to as Gross Output, this is the output of a boiler after accounting for combustion efficiency. We recommend sizing hot water boilers based on the DOE Heating Capacity.
207000 BTU
Net I=B=R Capacity Learn More
Net I=B=R Capacity
I=B=R, also referred to as Net Output or AHRI Capacity, is the rated heat output of a boiler after accounting for combustion efficiency, piping loss, and an extra pickup factor. We recommend sizing steam boilers based on the I=B=R rating.
180000 BTU
Ultra Low NOx Emissions Learn More
Ultra Low NOx Emissions
NOx is a byproduct of the combustion process, and it's output is regulated in some jurisdictions. Many regulators mirror SCAQMD rules, which regulate air quality for some parts of Southern California. Ultra Low NOx appliances emit less than 10-14 ng/J (nanogram per Joule) of NOx. Learn More
Electrical Data
60 Hz
Secondary Vent Pipe Diameter
4 Inches
Gas Connection Size
1/2 Inch
Flue Connection Size
3 Inches
Supply Connection
1 Inch
Return Connection
1 Inch
Product Height
43 1/16 Inches
Product Width
22 13/16 Inches
Product Depth
19 15/16 Inches
Product Weight
246 Pounds
Shipping Weight
246 Pounds
Energy Star Listed
CSA Listed
ASME Certified
AHRI Certified
AHRI Reference Number
Warranty Information
Parts Warranty Learn More
Parts Warranty
A warranty is a safeguard from defects in manufacturing and can vary in length and terms. Some manufacturers require registration for extended warranty benefits, be sure to check out features and the warranty document. To see the manufacturer's warranty statement, click on the Manuals tab. Learn More
2 Years
Heat Exchanger Warranty
12 Years


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Weil-McLain Ultra 230 - 207K BTU - 94.1% AFUE - Hot Water Gas Boiler - Direct Vent
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