Boilers

Weil-McLain Evergreen Condensing Boiler

Name: Weil-McLain Evergreen Condensing Boiler
Brand: Weil-McLain

Weil-McLain EvergreenWholesale contractor 67% data complete

$5,000 – $5,000

equipment only · rough estimate, no seller data yet

Installed price on hydronic work varies more by market, existing-system condition and contractor than by brand. Several products in this catalog explicitly recommend getting at least two contractor quotes for this reason.

Stainless condensing boiler from the most established US residential boiler brand.

Our take

Weil-McLain's advantage is institutional: nearly every hydronic contractor in the country has worked on one, and parts are available in any supply house. The Evergreen's turndown is more modest than Navien's, which costs some real-world efficiency on shoulder-season days, but it is a straightforward, well-supported machine.

Best for

Straight boiler replacement where contractor familiarity and parts availability outweigh peak specification.

Watch out for

Lower turndown means more cycling on mild days. Proper outdoor reset control matters more here than on a high-turndown unit.

Compare against

Lochinvar Knight Fire Tube Condensing Boiler

Fire-tube condensing boiler with 10:1 turndown, built for the residential and light-commercial hydronic market.

Navien NFC-175 Condensing Combi Boiler

High-turndown condensing combi boiler providing both hydronic heat and domestic hot water from one wall-hung unit.

Viessmann Vitodens 100-W Condensing Boiler

German-engineered condensing boiler with a stainless Inox-Radial heat exchanger and a 10:1 turndown ratio in line with the rest of this catalog's condensing boilers.

Rheem Prestige RCBH199DVLN Condensing Combi Boiler

199,000 BTU/h condensing combi boiler, a real currently-stocked substitute for the now-defunct Triangle Tube Prestige line this catalog originally targeted.

Before you buy this

Ask about turndown ratio, not just efficiency — a boiler that can't modulate down to your house's actual heat loss on a mild day short-cycles, and short-cycling is what wears a boiler out early. Confirm whether your radiators or baseboard were sized for the supply temperature this boiler will actually deliver. And ask for a heat-loss calculation instead of matching the old unit's output.

Specifications

Efficiency

How efficiently it turns fuel into heat, under lab conditions?

95%% AFUE -- meets the ENERGY STAR bar for gas boilers (90%+), and matches nearly every other unit in this catalog

Manufacturer submittal and specification sheets · tier 3

95%

AFUE

Every boiler in this catalog condenses and sits within about a point and a half of every other one. This catalog's own buying guide puts it plainly: two boilers can share a 95% AFUE rating and behave completely differently on a 45F day, because AFUE says nothing about turndown -- see modulation_ratio for the number that actually separates them.

Sizing

How much heat it's rated to deliver?

Rated at 110,000 BTU/h BTU/h. This number only means something matched against an actual heat-loss calculation for your house -- see the fit model note on oversizing below before treating a bigger number as better

Manufacturer submittal and specification sheets · tier 3

110,000 BTU/h

Rated capacity

Sizing to the old boiler's nameplate instead of a real heat-loss calculation is this category's single most common and most consequential regret -- see the oversizing_short_cycling cluster in this dossier.

Design

How gently it can run on a mild day?

A 5:1:1 turndown -- the shallowest in this catalog. Proper outdoor-reset control matters more here than on a high-turndown unit, because this one has less room to just run low and quiet instead of cycling

Manufacturer submittal and specification sheets · tier 3

5:1

Turndown ratio

This is the number this catalog's own buying guide identifies as the real efficiency differentiator -- not AFUE, which barely varies across this catalog at all. It only pays off if the installer actually commissions outdoor reset; an uncommissioned high-turndown boiler delivers none of this advantage.

Space heating only, or space heating plus hot water in one box?

Combi -- makes both heat and domestic hot water from one wall-hung unit. Saves floor space and a second appliance, at the cost of a ceiling on simultaneous hot-water demand.

Manufacturer submittal and specification sheets · tier 3

Combi (heat + domestic hot water)

This catalog's own research and its own buying guide agree on where the line sits: roughly one or two bathrooms and a modest household is fine for a combi; three-plus bathrooms or a large family should look at a heat-only boiler with an indirect tank instead. No spec sheet discloses how gracefully a given combi's mixing valve handles a second shower opening mid-draw -- that's a real, undisclosed gap, not a solved problem.

Ownership

Cover on parts if something fails?

10 yr years of parts cover -- the top of this catalog

Manufacturer submittal and specification sheets · tier 3

10 yr

Parts warranty

Most makers require registration within a set window or the term drops to a shorter base warranty -- confirm the installer actually did it. And a warranty is only as good as the manufacturer's ability to honor it: this catalog's own P1 research found a real, current example (Triangle Tube/Ideal Heating NA) of a boiler manufacturer ceasing US operations entirely, which voids the meaning of any warranty term on units bought after the closure date.

Cost

What people typically pay, installed?

Quotes usually start around $6,500 installed

EnergySage equipment guides · tier 4 · unverified

$6,500

Typical installed cost (low)

Top of the typical range?

and run up to about $12,000 for a larger or more complex hydronic job

EnergySage equipment guides · tier 4 · unverified

$12,000

Typical installed cost (high)

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