Weil-McLain EG-45
Model Number: EG-45
The workhorse cast iron steam boiler trusted in Long Island pre-war homes for generations.
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
- EG-45
- Efficiency (AFUE)
- 82%
- Boiler Type
- Steam Boiler
- BTU Input Range
- 105k - 175k BTU
- In Production
- Yes
- Parts Warranty
- 2 years
- Heat Exchanger Warranty
- Lifetime
Specification source not yet linked — figures are being verified against manufacturer data.
Ideal For
Pre-war steam radiator homes in Garden City, Hempstead, and Freeport
Expert Review: Weil-McLain EG-45
The Weil-McLain EG-45 is the gold standard for residential steam boilers on Long Island. In pre-war homes from Freeport to Garden City, the EG series has been keeping steam radiators warm for generations. When your 1920s steam boiler finally dies, the EG-45 is almost certainly what should replace it.
Why Steam Specialists Choose the EG Series
The EG-45 features heavy-gauge cast iron sections specifically designed for the thermal stress of steam operation. Steam boilers cycle on and off repeatedly throughout heating season, expanding and contracting with each cycle. Lesser cast iron cracks under this stress—the EG handles it for decades.
Best Applications for Nassau County Steam Systems
The EG-45 fits homes with 4-6 steam radiators—typical of Levittown and Massapequa 3-bedroom homes. Larger pre-war homes in Hempstead, Freeport, and Rockville Centre may require the EG-55 or EG-65 with additional sections. We size steam boilers based on the connected radiation (EDR), not square footage.
Lifetime Warranty
The EG series carries Weil-McLain's lifetime limited warranty on the cast iron heat exchanger when installed by a licensed contractor. This warranty has actual value: cast iron steam boilers truly can last 40+ years. We service EG boilers installed in the 1980s still running strong.
Steam System Expertise Required
Steam boiler installation requires specialized knowledge. Proper piping, near-boiler piping, and Hartford Loop connections are critical for safety and efficiency. The EG-45 price includes professional installation by our steam-certified technicians who understand the nuances of these systems.
Key Features & Technology
Heavy-gauge cast iron sections
Natural draft venting
Steam or hot water compatible
50+ year service life
Proven in pre-war Long Island homes
Advantages
- Gold standard for residential steam systems
- Lifetime cast iron heat exchanger warranty
- Heavy-gauge sections handle thermal cycling
- Perfect for pre-war Long Island homes
- Excellent parts availability at F.W. Webb
- 40+ year proven lifespan
Considerations
- 82% AFUE - lower than condensing alternatives
- Steam-only - not suitable for hot water conversion
- Requires specialized installation expertise
- Higher fuel costs than modern hot water systems
Sizing & Installation Notes
Steam boilers like the EG-45 are sized to the connected radiation — we measure every radiator's EDR rating and match the boiler's steam output to that total, plus piping pickup allowance. Square footage rules of thumb don't apply to steam.
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 and steam boiler installation, or see current rebate and incentive programs that may apply.
Warranty & Protection
Parts Warranty
2 years
Heat Exchanger
Lifetime
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 |
|---|---|---|---|---|
| EG-45 (this model) | 82% AFUE | 105k - 175k BTU | — | Lifetime |
| Ultra Series 3 | 95% AFUE | 80k - 399k BTU | — | 15 years |
| CGi Series 4 | 84% AFUE | 75k - 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 Steam Boilers 2027 guide to compare across brands.
Frequently Asked Questions
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