Weil-McLain Ultra Series 3-UE Gas Boiler Characteristics

Follow us


Weil-McLain is among the top-of-the-line boiler systems manufacturers. It’s a leading designer and marketer of oil- and gas-fired steam and hot water boilers that are used to heat space in commercial, residential and institutional buildings.

Weil-McLain gas boilers are created for long-lasting performance and improved fuel economy with AFUE up to 96.4%. They are constructed of extremely durable components and deliver quiet, consistent warmth. To meet your specific commercial and residential heating needs, a wide range of models is available.

ultra series 3-ue gas boiler

Weil-McLain Ultra Series 3-UE Gas Boiler

The best plumbing & heating experts choose Ultra gas boilers due to their reliability, fuel efficiency, easy maintenance and low NOx emissions.

Ultra Series 3-UE gas boiler delivers instant payback in energy savings, unmatched comfort and peace of mind. It comes in six models/sizes: UG-80 (MBH), UG-105 (MBH), UG-155 (MBH), UG-230 (MBH), UG-299 (MBH), and UG-399 (MBH). All boilers are characterized by AFUE in the range of 95.2% – 96.4%. When used in low temperature applications such as radiant heating, they can achieve efficiencies up to 98.0%. That is why the boilers are Energy Star rated.

Besides, the Ultra Series 3-UE gas boiler is environmentally friendly and provides low NOx applications with cleaner combustion, thus reducing green house gases.

The Ultra boiler requires minimal floor space and, furthermore, it can be used both in floor standing and wall hung applications. It is also quite lightweight in comparison with a conventional boiler. Entering and receiving information is very easy due to simple programming buttons and the backlit LCD display. The latter allows checking outdoor and water temperatures, view current boiler status, review boiler maintenance schedule or view contact information of your installing contractor.

Standard Equipment

  • Сast aluminum heat exchanger
  • Venturi mixing body which mixes gas and air providing higher efficiency
  • Stainless steel burner
  • 30 PSI ASME relief valve
  • Direct spark ignition
  • Negative regulated gas valve
  • Variable speed blower assembly
  • 50 VA transformer
  • Ignition control
  • Air/gas ratio Venturi with air silencer
  • Return water temperature sensor
  • Outlet water temperature sensor
  • Combination T&P gauge
  • Outdoor temperature sensor
  • Flue gas temperature sensor
  • Low water protection
  • Two pump controls DHW& heating
  • DHW priority
  • Control module with data port & digital display
  • Modulating & high limit temp control
  • Complete jacket assembly
  • Outdoor reset
  • Four adjustable boiler legs
  • Air termination kit/sidewall vent
  • Pre-wired terminal strips
  • Line & low voltage
  • On/off power switch
  • Condensate trap (with drain tee assembly)
  • U-Control that enables easy set-up and maintenance
  • Line voltage service receptacle
  • Limited 15-year warranty on heat exchanger and 5-year warranty on parts and labor. Extended service warranty is available.