High efficiency, Weil-McLain quality
Whether you’re a homeowner, contractor or building engineer, there’s a Weil-McLain high-efficiency boiler that delivers the performance you need. The lineup is engineered to live up to our legendary standards and push hydronic heating forward at the same time.
"We have a long standing relationship with Weil-McLain, and we trust the quality of their boilers. The SVF boilers were the perfect match for the space."
- Eric Cameron, project manager, Nu-Mun Contracting. Read case study
Residential boilers
![Eco Tec High Efficiency Residential Boiler](/sites/default/files/EcoTec-FrontLeft-WallMount-Isolated-WM2003_logo_lowres.png)
ECO Tec
This premium heat-first combination boiler provides hot water when you need it and comfort where you want it with extreme efficiency.
![Evergreen Pro High Efficiency Residential Boiler](/sites/default/files/Evergreen_Residential_515x298_0.png)
Evergreen
Quiet, sleek and sustainable space heating that’s adaptable to any residential heating application.
![Ultra Series 4 High Efficiency Residential Boiler](/sites/default/files/ultra-s4-fullline_0.png)
Ultra Series 4
This corrosion-resistant boiler is designed to operate in low-temperature condensing applications.
![GV90+ High Efficiency Residential Boiler](/sites/default/files/GV90_frontleft_mediumres2.png)
GV90+
Our industry-leading, cast iron dependability meets high-efficiency performance with this boiler great for high-temperature systems.
Commercial boilers
![Evergreen High Efficiency Commercial Boiler](/sites/default/files/Evergreen_Commercial_515x298_0.png)
Evergreen
Larger Evergreen models are ideal for light-to-medium commercial and/or multi-unit residential installations.
![SlimFit High Efficiency Commercial Boiler](/sites/default/files/SlimFit_515x298_0.png)
SlimFit
The cast aluminum SlimFit is the fastest, easiest solutions for limited-space commercial retrofits.
![SVF High Efficiency Commercial Boiler](/sites/default/files/svf-frontleft-full-line.jpg)
SVF
This state-of-the-art boiler is ideal for schools and municipal buildings, hybrid applications or replacements.
Our high-efficiency boilers are tested and/or certified to the industry’s highest standards
![Department of Energy](/sites/default/files/350px-Seal_of_the_United_States_Department_of_Energy.png)
Department of Energy
![ENERGY STAR](/sites/default/files/Energy_Star_logo.png)
ENERGY STAR
![AHRI – Air-Conditioning, Heating, & Refrigeration Institute](/sites/default/files/ahri-logo-color-ns-1.png)
AHRI
Air-Conditioning, Heating, & Refrigeration Institute
![ASME – American Society of Mechanical Engineers](/sites/default/files/asme_logo_large.png)
ASME
American Society of Mechanical Engineers
![Department of Energy](/sites/default/files/csa-grouplogo.png)
CSA
Canadian Standards Association
![Department of Energy](/sites/default/files/UL_Mark.png)
UL
Underwriters Laboratories
![ANSI – American National Standards Institute](/sites/default/files/ANSI_logo.png)
ANSI
American National Standards Institute
![Intertek](/sites/default/files/Intertek.png)
Intertek
![NFPA – National Fire Protection Association](/sites/default/files/1200px-NFPA_logo.png)
NFPA
National Fire Protection Association
![SCAQMD – South Coast Air Quality Management District](/sites/default/files/AQMD_logo.png)
SCAQMD
South Coast Air Quality Management District
Let’s talk high-efficiency boilers
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Frequently asked questions
Which are Weil-McLain’s best residential and commercial boilers?
This is a very good question! The “best” answer is the boiler that fits your application the best. We have many choices for water systems and generally the higher efficiency boilers like our Evergreen Gas Boiler will be right for the application. Steam systems will require a boiler that meets the heating load plus a small pickup factor. Commercial boilers are designed for larger heating loads, but the same criteria we used for residential systems apply: Use the boiler that best fits the application with efficiency in the forefront of the design.
What is Weil-McLain’s most efficient boiler?
Weil-McLain’s lineup of high-efficiency boilers is second to none. For residential water applications, our Evergreen Gas boiler tops the list. If a combi application is needed, our Eco Tec Gas Boiler is best. Commercial water system efficiencies will be enhanced by using our SVF stainless steel condensing boiler.
How much does a high efficiency boiler save?
Generally, high-efficiency boilers will cut fuel costs between 10 and 20 percent, based on system design and operating temperatures.
How efficient is a combi boiler?
Today’s combi boilers are state-of-the-art and have standard efficiencies at 95 percent or above. You can learn more about efficiency ratings here.
What factors affect boiler efficiency?
There are many factors that affect boiler’s efficiency. First and foremost is water. Whether you have a steam or water system, the cleaner the water the higher your boiler efficiency will be. Another important factor is the tune of your combustion system. A properly tuned boiler will use less fuel, therefore increasing or sustaining the highest operational efficiency. You can learn more factors and tips for increasing energy efficiency here.