Description

This Weil-McLain model has been discontinued, but GSHA Services continues to service and repair existing Weil-McLain boilers. If your boiler needs repair, contact us to schedule service. If you’re considering replacement, explore the current option below.

Schedule Boiler Repair See Current Alternative or call (224) 220-3660.

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. Weil-McLain equipment is purchased through local distributors.

About this model

The ECO was Weil-McLain’s residential wall-mount condensing boiler. It is a hot-water (hydronic) boiler only, in all three sizes. Hot-water boilers circulate heated water to radiators, baseboard or floor tubing; steam boilers boil water and send steam to older cast-iron radiators. The two are not interchangeable, so a hot-water boiler like the ECO can only replace another hot-water boiler.

The ECO is also a heating-only boiler: it heats the home, and it supplies domestic hot water only when it is piped to an indirect water heater. An indirect water heater is a storage tank heated by the boiler’s water, so the boiler also supplies your showers and taps; the ECO control runs that tank with priority. The ECO is not a combi boiler (one appliance that heats the home and makes domestic hot water) and not a tankless water heater (domestic hot water only).

As a condensing boiler it uses a stainless steel firetube heat exchanger and a modulating premix burner, and it vents through 3-inch plastic or stainless pipe out a sidewall or through the roof rather than up a masonry chimney; it also needs a condensate drain. By contrast, a non-condensing cast-iron boiler such as the Weil-McLain CGa sends hot flue gas up a chimney at about 84% AFUE. A condensing boiler like the ECO cools the flue gas so far that it can vent through plastic pipe out a sidewall, which is why it needs a condensate drain and can go almost anywhere a vent can reach.

It was made in three sizes. The figures below come from the manufacturer’s archived ECO Series 2 data (boiler manual 550-142-190/0120).

Specification	ECO 70	ECO 110	ECO 155
Input	70,000 BTU/h	110,000 BTU/h	155,000 BTU/h
DOE heating capacity	65,000 BTU/h	101,000 BTU/h	143,000 BTU/h
Net AHRI water rating	57,000 BTU/h	88,000 BTU/h	124,000 BTU/h
AFUE	95.2%	95.0%	95.1%
Operating weight	105 lb	94 lb	120 lb
Water content	2.54 gal	2.54 gal	3.22 gal
Boiler type	Hot-water (hydronic) only; heating-only, indirect domestic hot water with priority
Fuel	Natural gas, field-convertible to propane (orifice supplied)
Heat exchanger	Stainless steel firetube; premix modulating stainless burner (condensing, Category IV)
Venting	Direct vent required (direct exhaust permitted); 3 in PVC/CPVC/polypropylene/stainless (ECO 70 also 2 in); sidewall or vertical
Ignition	Direct spark
Controls	ECO control with electronic display (boiler- or remote-mounted), modulation, outdoor reset, DHW priority, multi-boiler
Manufacturer warranty (existing units)	Residential: 10 years heat exchanger, 1 year parts, labor not covered (Weil-McLain ECO residential warranty 550-141-075)

Source: Weil-McLain ECO Series 2 Boiler Manual and ECO residential warranty document (manufacturer’s archived data). Cabinet dimensions are not stated here; see the manufacturer’s product data.

Two terms worth knowing: input is the gas the boiler burns; the net AHRI rating is the heat actually delivered to your radiators after piping losses, and it is the number that should be matched to a heat-loss calculation for your home, not to the old boiler’s nameplate. AFUE is the share of that fuel turned into heat over a season – 95% means very little goes up the vent.

Repair and service for this model

A discontinued boiler does not have to be replaced. GSHA Services, LTD services and repairs existing Weil-McLain boilers, including the ECO. If your ECO is running well, a repair is often the sensible choice when the heat exchanger is sound.

Typical serviceable items on a condensing wall-mount boiler of this kind include:

• ignition and flame-sensing components;
• the gas valve and blower;
• water and flue temperature sensors;
• the condensate trap and drain;
• the circulator, expansion tank and relief valve;
• control settings such as outdoor reset.

An annual tune-up matters on a condensing boiler: cleaning the heat exchanger and condensate trap and checking combustion keeps it efficient and helps it last.

Repair pricing is diagnosed on site – there is no flat rate for a specific fault. To book a visit, use Schedule Boiler Repair. For the full Weil-McLain line-up see our Weil-McLain boilers page and our Boiler Installation hub.

Current alternative: Weil-McLain ECO Tec Series 2

Weil-McLain has not published a statement naming a successor to the ECO, so we do not call any model a direct replacement. The closest current alternative is the Weil-McLain ECO Tec Series 2 wall-hung condensing boiler: it is the same family – a residential wall-mount stainless steel firetube condensing boiler at 95% AFUE with PVC/CPVC/polypropylene/stainless direct venting on 3-inch vent connections (2- or 3-inch vent pipe per the manual).

What changed: the ECO Tec Series 2 comes as heat-only models (80-H, 110-H, 150-H, 199-H) and as combi models (110-C, 150-C, 199-C) that also make domestic hot water without a separate tank. It has a touchscreen control that adjusts the boiler to outdoor temperature for even heat. Its residential manufacturer warranty is 12 years on the heat exchanger (no registration needed) and 5 years on parts when registered within 90 days of installation, otherwise 2 years on parts; labor is not covered by the manufacturer.

By size, an ECO 70 roughly corresponds to an ECO Tec 80-H, an ECO 110 to a 110-H, and an ECO 155 to a 150-H or 199-H – but the right size comes from a heat-loss calculation, not the old nameplate.

Replacement selection always depends on your home’s heating system (hot water or steam – the ECO and ECO Tec are hot-water boilers only), the fuel, heat-loss sizing, venting and condensate arrangements, and installation requirements such as gas line capacity, piping, zoning and electrical. A free on-site estimate settles these. No installed price is published for the ECO Tec; the right replacement for your home is settled at a free on-site estimate. Financing available with approved credit – see financing.

Current Weil-McLain hot-water boilers we install include the GV90+ condensing boiler and the CGa cast-iron chimney-vented boiler; for a home with steam radiators, see the EG Series 7.

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 throughout that area from Woodstock and Lake Bluff, Illinois – check our service area page for the city and ZIP list.

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

Yes, in most cases. GSHA Services, LTD repairs existing Weil-McLain ECO boilers, and Weil-McLain still lists the ECO 70, 110 and 155 in its parts catalog; availability of a specific part is confirmed at the time of repair. Discontinued means the factory no longer builds new units, not that yours must be replaced – if the heat exchanger is sound and repairs are reasonable, keeping it running and maintaining it annually is usually the right call.

Is the ECO a steam or hot-water boiler?

Hot-water only, in all three sizes; it cannot serve steam radiators. If your home has steam radiators, a steam boiler such as the Weil-McLain EG Series 7 is the type to look at, and the ECO Tec would not apply.

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

A combi boiler heats the home and makes domestic hot water in one appliance. A heating-only boiler like the ECO heats the home and needs an indirect water heater or a separate water heater for hot water. A tankless water heater makes hot water only and does not heat the home.

What replaces the Weil-McLain ECO?

Weil-McLain has not named an official successor. The closest current alternative is the Weil-McLain ECO Tec Series 2, a wall-hung stainless steel condensing boiler in the same family, available heat-only or as a combi. We label it an alternative, not a direct replacement.

Will a new boiler fit my existing venting and piping?

Often, but not always. A condensing boiler like the ECO Tec uses similar plastic direct venting and a condensate drain, so an existing ECO installation is a good starting point, yet vent routing, gas line capacity, piping, circulators and the indirect water heater all have to be checked. The free on-site estimate confirms the venting, gas line and piping requirements before any price is given.

What does a replacement installation include and what can change the price?

There is no set price: a replacement boiler is quoted as an installed price after a free on-site estimate, because every boiler installation is custom. The venting route and condensate drainage, gas line capacity, piping and zoning changes, circulators and zone valves, the expansion tank and air separation, water-quality treatment, electrical work, removal of the old boiler, permits and accessories (priced separately) all differ from home to home and change the final price.

When does repair make more sense than replacement?

Repair usually makes sense when the boiler is not very old, the heat exchanger is sound, the fault is a single component, and parts are available. Replacement becomes the better choice when the heat exchanger leaks or is badly scaled, repairs are repeating, or a safety issue cannot be corrected. We give you the honest picture on site.

Need help with a Weil-McLain ECO boiler?

Schedule Boiler Repair Request a Boiler Installation Estimate or call (224) 220-3660. GSHA Services, LTD, Woodstock and Lake Bluff, Illinois – see our service area.