Weil-McLain Ultra Series 3
Model Number: UL3
Weil-McLain flagship condensing boiler with 95% AFUE efficiency and modulating technology for maximum comfort.
Technical Specifications
Prices depend on sizing, venting and piping in your home, so we quote every installation.
Sizing: the right size comes from a room-by-room heat-loss calculation, not the size of the old boiler or a rule of thumb. Oversized boilers short-cycle and waste fuel; steam systems are sized to the connected radiation instead. See how we approach boiler installation.
Home-Specific Operating Cost Review
No guaranteed annual savings or payback period
Historical Use
Fuel consumption and weather
Current Rates
Utility and delivered-fuel prices
System Design
Load, piping, controls, and temperatures
Full Specifications
- Model Number
- UL3
- Efficiency (AFUE)
- 95%
- Boiler Type
- Condensing Boiler
- BTU Input Range
- 80k - 399k BTU
- In Production
- Yes
- Parts Warranty
- 5 years
- Heat Exchanger Warranty
- 15 years
Specification source not yet linked — figures are being verified against manufacturer data.
Ideal For
Modern hot water systems in energy-conscious homes
Expert Review: Weil-McLain Ultra Series 3
The Weil-McLain Ultra Series 3 is our top-selling condensing boiler for Long Island hot water systems. At 95% AFUE, it captures heat that older cast iron boilers send up the chimney, reducing annual heating costs by 20-30% compared to standard-efficiency models.
Why Nassau County Contractors Choose the Ultra 3
The Ultra Series 3 features a stainless steel fire tube heat exchanger that resists thermal stress and corrosion. Unlike some competitors, the heat exchanger is field-serviceable—cleaning and inspection don't require unit replacement. The modulating burner adjusts from 20% to 100% capacity, eliminating the short-cycling that wastes fuel in oversized systems.
Best Applications
The Ultra 3 excels in multi-zone hot water systems with 3-6 thermostats. Common installations include Levittown split-levels, Massapequa ranches, and Garden City Colonials with baseboard or radiant floor heating. Output ranges from 50,000 to 299,000 BTU depending on model, covering homes from 1,500 to 4,000 square feet.
PSEG Long Island Rebates
At 95% AFUE, the Ultra Series 3 qualifies for PSEG rebates up to $750. We handle all rebate paperwork as part of our installation service. Combined with annual fuel savings, most homeowners recoup the efficiency premium within 4-5 years.
Installation Notes for Long Island
The Ultra 3 requires PVC or CPVC venting—no masonry chimney needed. This simplifies installation in homes where the old chimney is deteriorating. Direct vent through a sidewall is common in Hicksville and Bethpage basements. The unit requires a condensate neutralizer to protect your drain lines from acidic condensate.
Key Features & Technology
Stainless steel heat exchanger
Modulating burner technology
Built-in outdoor reset
Ultra-quiet operation under 45 dB
ENERGY STAR certified
Advantages
- 95% AFUE qualifies for PSEG rebates up to $750
- Modulating burner prevents short-cycling
- Stainless steel heat exchanger with 12-year warranty
- Field-serviceable components reduce repair costs
- PVC venting eliminates masonry chimney requirements
- Quiet operation under 45 dB
Considerations
- Higher upfront cost than cast iron alternatives
- Requires annual maintenance for optimal performance
- Condensate neutralizer adds to installation cost
Sizing & Installation Notes
Condensing boilers like the Ultra Series 3 reach their rated efficiency only when return water runs cool enough to condense flue gases. We check your radiation and design water temperatures so the unit actually condenses in your home, not just on the spec sheet.
Every Weil-McLain installation starts with a free in-home assessment covering the heat-loss calculation, venting and chimney condition, and gas or oil supply sizing. Learn more about our boiler installation process, or see current rebate and incentive programs that may apply.
Warranty & Protection
Parts Warranty
5 years
Heat Exchanger
15 years
Our Guarantee
100% Satisfaction
All Weil-McLain boiler installations by Home+ Air & Heat include our 1-year workmanship warranty, covering labor and any installation-related issues.
Compare the Weil-McLain Lineup
| Model | Efficiency | BTU Range | Fuel | Heat Exchanger Warranty |
|---|---|---|---|---|
| Ultra Series 3 (this model) | 95% AFUE | 80k - 399k BTU | — | 15 years |
| CGi Series 4 | 84% AFUE | 75k - 175k BTU | — | Lifetime |
| EG-45 | 82% AFUE | 105k - 175k BTU | — | Lifetime |
| EG Series 6/7 | 84% AFUE | 75k - 282k BTU | natural gas/propane | 10-year (EG/PEG steam) or 20-year (EG water) |
| Evergreen Pro | 95% AFUE | 110k - 399k BTU | natural gas/propane | lifetime limited |
| GV90+ | 91.9% AFUE | 70k - 175k BTU | natural gas/propane | primary (cast iron) 20-year, secondary (stainless) 5-year |
| Simplicity | 95% AFUE | 110k - 199k BTU | natural gas/propane | lifetime limited |
| Ultra Oil | 87% AFUE | 112k - 196k BTU | oil | 20-year |
| WGO/WTGO Series 4 | 87% AFUE | 98k - 357k BTU | oil | 20-year |
| AquaBalance Series 2 | 95% AFUE | 80k - 155k BTU | natural gas/propane | 10-year limited residential / 5-year limited commercial |
| CGi Series 5 | 84% AFUE | 48k - 222k BTU | natural gas/propane | 20-year residential / 10-year commercial limited transferable (CGi Series 5 sales flyer) |
| ECO Tec | 95% AFUE | 80k - 199k BTU | natural gas/propane | 12-year residential / 10-year commercial primary heat exchanger (brochure) |
| Ultra Gas Series 4 | 94.1% AFUE | 80k - 399k BTU | natural gas/propane | 12-year residential / 10-year commercial (Ultra Series 4 brochure) |
| SGO Series 4 | 85% AFUE | 133k - 357k BTU | oil | 10-year |
| CGa Series 4 | 84% AFUE | 38k - 233k BTU | natural gas/propane | 20-year |
See the full Weil-McLain brand page for lineup context, or browse the Best Condensing Boilers guide to compare across brands.
Frequently Asked Questions
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