Description

GSHA Services, LTD installs, services and repairs Weil-McLain boilers in McHenry County and Lake County, Illinois, the northern and western Chicago suburbs and southeastern Wisconsin. The LGB is a commercial boiler, so every LGB project is sized and quoted individually: installed price after a free on-site estimate.

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What the Weil-McLain LGB is

The LGB is Weil-McLain’s cast-iron commercial gas boiler, listed in two current series: LGB Series 2 (LGB-4 to LGB-23, 400 to 2,860 MBH input, 20 sizes) and the LGB High Efficiency Series 3 (LGB-4R to LGB-20, 350 to 2,470 MBH input, 14 sizes). MBH means thousand BTU per hour. Every size is rated for either steam or hot-water heating. In a hot-water system a pump circulates heated water through radiators, baseboard or unit heaters; in a steam system the boiler boils water and steam rises through the piping on its own. The two are not interchangeable, so the boiler is ordered for the system the building already has.

It is a heating-only boiler. Unlike a combi boiler, which heats the building and makes domestic hot water in one unit, the LGB makes no domestic hot water; hot water comes from an indirect water heater (a storage tank heated by the boiler) or a separate water heater. A tankless water heater makes hot water only and does not heat the building.

The LGB is a non-condensing boiler with cast-iron sections tested to 80 psi. Series 2 vents by natural draft through a draft hood into a chimney (flue outlet 10 to 20 inches depending on size); Series 3 adds a draft inducer and is rated Category I on steam and Category II on water. Because it is non-condensing, the LGB must vent into a sound chimney, often with a liner (a metal flue pipe run inside the masonry), rather than through a plastic sidewall vent like a condensing boiler, which is why chimney condition is checked on every project. Weil-McLain rates Series 2 at up to 85.1% thermal efficiency, model dependent, and Series 3 at 84% thermal efficiency on water and 81% on steam. No AFUE is published for this series: AFUE is the seasonal efficiency rating used for residential boilers, and commercial boilers are rated by thermal efficiency instead.

Series 2 runs on natural gas, with propane available through a conversion kit, and uses an intermittent electronic pilot. Controls include Weil-McLain’s WFFP control panels, a low-water cutoff, and CSD-1 and FM control options on both series; Series 3 adds a two-line LCD display. Series 2 shipping weights run from 1,185 to 6,625 lb. Cast-iron sections are the bolted-together iron chambers that hold the boiler water; they tolerate high water temperatures and give this type of boiler a long service life when the system water is kept clean.

Sizing and installed price

An LGB is sized from a heat-loss calculation of the building, not from the old boiler’s nameplate. Input (MBH) is the gas burned; the boiler’s net rating, the heat actually delivered to the system, is smaller, and the estimate sizes from the net rating against the building’s heat loss. There is no standard installation package for the LGB, so no starting price is shown: installed price after a free on-site estimate. The estimate covers the chimney and flue sizing (and a liner if needed), gas line capacity for a 350 MBH-and-up burner, steam or hot-water near-boiler piping, circulators or condensate-return equipment, expansion tank and air separation on hot-water systems, water-quality treatment, electrical work, controls (CSD-1 or FM where required), removal of the old boiler, permits and accessories, which are priced separately. Financing available with approved credit; see financing.

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Specifications

Item	Weil-McLain LGB
Series	LGB Series 2 (LGB-4 to LGB-23) and LGB High Efficiency Series 3 (LGB-4R to LGB-20); both current under Weil-McLain Commercial Boilers
Boiler type	Cast-iron commercial gas boiler; steam or hot water, every size; heating-only; non-condensing
Fuel	Natural gas; propane via conversion kit (Series 2)
Input range	Series 2: 400 to 2,860 MBH (20 sizes); Series 3: 350 to 2,470 MBH (14 sizes)
Efficiency	No AFUE published. Series 2: up to 85.1% thermal efficiency, model dependent. Series 3: 84% thermal (water), 81% thermal (steam)
Heat exchanger	Cast-iron sections, tested to 80 psi
Venting	Series 2: natural draft with draft hood, flue outlet 10 to 20 in. Series 3: draft inducer, Category I steam / Category II water
Ignition	Intermittent electronic pilot (Series 2)
Controls	Series 2: WFFP control panels, low-water cutoff, CSD-1 and FM options. Series 3: two-line LCD display, CSD-1 and FM options
Shipping weight	Series 2: 1,185 to 6,625 lb; height and width in the manufacturer’s product data
Installed price	Installed price after a free on-site estimate

Source: Weil-McLain LGB Series 2 and LGB High Efficiency Series 3 product pages, the Series 2 brochure and the Weil-McLain commercial warranty document. Vent material, Series 3 ignition and propane availability, and construction details are not stated on the current manufacturer pages and are left out.

Repair and service

If you already own an LGB, GSHA Services, LTD repairs and services existing Weil-McLain hot-water boilers, and the LGB is a current Weil-McLain model. Tell us whether your building runs on steam or hot water when you call so we can confirm service. Repairs are diagnosed on site. An annual tune-up matters on a chimney-vented cast-iron boiler: it checks combustion and draft, the low-water cutoff and the safety controls, and catches small problems before the heating season.

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Warranty

Manufacturer warranty (Weil-McLain commercial warranty 550-141-064): cast-iron sections 10 years; parts 1 year; labor not covered. The warranty is transferable and registration is not required.

GSHA’s Install-Right coverage is written into our residential installation packages. There is no LGB package, so GSHA’s installation warranty for a commercial boiler is stated in the written estimate; it is not a published package.

Frequently asked questions

Do you install and repair Weil-McLain boilers in my city?

Yes, if you are in McHenry County or Lake County, Illinois, the northern and western Chicago suburbs or southeastern Wisconsin. GSHA Services, LTD installs, services and repairs Weil-McLain boilers from Woodstock and Lake Bluff, Illinois; check our service area page for the city and ZIP list.

Can my existing or discontinued Weil-McLain boiler be repaired?

Yes, if it is a hot-water boiler. GSHA Services, LTD repairs and services existing Weil-McLain hot-water boilers, including the LGB, which is a current model, and discontinued models such as the ECO as long as parts are available. If your LGB is a steam boiler, tell us when you call so we can confirm service.

What is the difference between a combi boiler and a heating-only boiler?

A combi boiler heats the building and makes domestic hot water in one appliance; the LGB is heating-only, so hot water needs an indirect water heater fed by the boiler or a separate water heater. A tankless water heater makes hot water only and does not heat the building.

Is this boiler for steam or hot-water heating?

Both: every LGB size is rated for steam or hot water, and the boiler is ordered for the system the building has. A steam boiler boils water and sends steam to the radiators; a hot-water boiler pumps heated water through the system. The two are not interchangeable.

What does installation include and what can change the price?

The installed price is set by a free on-site estimate because there is no standard LGB package. The estimate covers the chimney and flue sizing and any liner, gas line capacity, steam or hot-water near-boiler piping, circulators or condensate-return equipment, expansion tank and air separation, water-quality treatment, electrical work, required controls, removal of the old boiler, permits and accessories, which are priced separately.

When does repair make more sense than replacement?

Repair usually makes sense when the cast-iron sections are sound and the problem is a control, ignition, low-water cutoff or circulator part. Replacement is considered when a section leaks, repairs keep recurring, parts become hard to get, or a safety problem with venting or combustion cannot be corrected.

What is the difference between LGB Series 2 and Series 3?

Series 2 is the natural-draft LGB with a draft hood, 20 sizes from 400 to 2,860 MBH and Weil-McLain’s WFFP control panels. The High Efficiency Series 3 adds a draft inducer and a two-line LCD display, covers 14 sizes from 350 to 2,470 MBH, and is rated 84% thermal efficiency on water and 81% on steam. Both are current commercial boilers.

Does the LGB provide domestic hot water?

No. It is a heating-only boiler. Domestic hot water needs an indirect water heater piped to the boiler as a zone, or a separate water heater.

Schedule service or an estimate

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See all Weil-McLain boilers, the Boiler Installation hub and our service area. Related Weil-McLain models: the EG Series 7 (residential, water or steam, up to 282,000 BTU/h) and the discontinued EGH Series 5 steam boiler.