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Quick answer: The Weil-McLain Evergreen Pro is a high-efficiency condensing gas boiler for hydronic (hot water) heating. Weil-McLain publishes DOE AFUE of 95.0% on the EVG-110 through EVG-299 and 96.5% on the EVG-399, with CSA inputs from 110 to 399 MBH, so it covers large homes and small commercial buildings. Airmax installs and services it and is CT licensed HTG.0414617-D1.
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| Type | Condensing gas boiler for hydronic heating (baseboard, radiators, radiant) |
|---|---|
| Published DOE AFUE | 95.0% (EVG-110, 155, 220, 299); 96.5% on the EVG-399 |
| Model range | EVG-110 / 155 / 220 / 299 / 399 — CSA input 110 to 399 MBH |
| Net AHRI capacity | 88 to 333 MBH across the range (manufacturer-published) |
| Fuel | Natural gas or propane, per model configuration |
Source: Weil-McLain Evergreen Pro published brochure and ratings table. Figures are the manufacturer's published values and vary by model; confirm the exact model on your quote. Airmax installs and services this equipment.
Fairfield County has a lot of hot-water heating — cast-iron radiators, baseboard, and radiant floors in newer builds. A condensing boiler recovers heat from the flue gases that an older atmospheric boiler sends up the chimney, so it earns its keep in houses that run long heating seasons. The efficiency is only realized if the system is piped and controlled to return water cool enough to condense, which is a design decision, not a box swap.
Most existing boilers in older homes are dramatically oversized, because they were sized to the previous boiler rather than to the building. A heat-loss calculation usually points to a smaller unit, which then short-cycles less and lasts longer. The EVG range from 110 to 399 MBH exists so the boiler can be matched to the actual load instead of rounded up.
Heat-loss calculation, boiler selection and near-boiler piping, condensing-appropriate venting, a condensate drain and neutralizer where required, circulator and control strategy including outdoor reset, and commissioning. Local permitting applies. Airmax handles permitting as part of the job.
Weil-McLain publishes DOE AFUE of 95.0% for the EVG-110, EVG-155, EVG-220 and EVG-299, and 96.5% for the EVG-399.
EVG-110, EVG-155, EVG-220, EVG-299 and EVG-399, with CSA inputs of 110 to 399 MBH and net AHRI capacities of 88 to 333 MBH.
It depends on the emitters and the piping. Condensing efficiency requires cool return water, so systems with generous radiators or radiant floors benefit most. High-temperature baseboard can still work, but the design has to be right, which is assessed on site.
It is a heating boiler. Domestic hot water is handled with an indirect tank or a separate water heater. If combining heat and hot water in one unit is the goal, a combi boiler is the product category to look at instead.
Condensing boilers vent differently from older atmospheric boilers, so the venting is part of the replacement scope, along with a condensate drain path.
Airmax Heating & A/C installs and services Weil-McLain boilers across Fairfield County, CT and Westchester County, NY. CT license HTG.0414617-D1, 24/7 service, free estimates. Call (866) 203-0469.
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Airmax Heating & A/C — CT license HTG.0414617-D1, fully insured, 24/7 service. Serving Stamford, Greenwich, Darien, New Canaan, Norwalk, Westport and Fairfield in Fairfield County, CT, and Rye, Port Chester, Mamaroneck and New Rochelle in Westchester County, NY. Free estimates on installations.