Jobs › Ecolab

Boiler Mechanic

Ecolab · Naperville, IL · Full time

Posted Sep 14, 2026 · We last checked this listing on Oct 6, 2026

Apply at Ecolab

Likely interview questions for this role

Written from this job description, not a generic list. Each one notes what the interviewer is really checking.

About your past

Tell me about your experience operating and maintaining high-pressure boilers.

What they are checking: Direct experience with the high-pressure boilers at the Naperville cogeneration plant.

Tell me about a time you diagnosed and repaired an equipment failure.

What they are checking: Troubleshooting skill on complex plant equipment.

The posting also mentions facilities maintenance. Tell me about other building systems you have worked on.

What they are checking: Range of skills beyond boilers for general facility upkeep.

What would you do

The boiler shows a low water alarm. What do you do?

What they are checking: Quick, correct response to an alarm that can cause a dangerous failure.

You are asked to do a repair that you think is unsafe. What do you do?

What they are checking: Willingness to stop unsafe work and raise concerns.

About the work

What licenses or certifications do you hold for boiler operation?

What they are checking: Whether they meet the legal requirements for operating high-pressure boilers.

Walk me through a preventive maintenance routine you would do on a steam turbine.

What they are checking: Practical knowledge of turbine maintenance in a cogeneration plant.

How do you work safely around high-voltage generators?

What they are checking: Electrical safety habits, including lockout/tagout, around high-voltage equipment.

How do you keep maintenance records so the next shift knows what you did?

What they are checking: Clear documentation in a plant that runs continuously.

What do you know about boiler water chemistry and why it matters?

What they are checking: Understanding of how water treatment protects boilers, especially at a water technology company.

Practice this interview out loud.

Offer builds a real interview for this exact role at Ecolab from your resume and this job description, asks the questions one at a time, and tells you what landed. The first one is free.

Practice this out loud

The full job description

As published by Ecolab.

Ecolab is seeking a Boiler and Facilities Mechanic to join our team in Naperville, IL. At Ecolab, we help industrial customers around the globe optimize operations and achieve business goals by providing digitally enabled, end-to-end water management and hygiene solutions. Our expertise and ongoing innovation ensure operational efficiency, safety, sustainability, and customer satisfaction. What’s in it For You • The opportunity to take on some of the world’s most meaningful challenges, helping customers achieve clean water, safe food, and healthy environments • The ability to make an impact and shape your career with a company that is passionate about growth • The support of an organization that believes it is vital to include and engage diverse people, perspectives and ideas to achieve our best • Comprehensive benefits package starting day one of employment including medical, dental, vision, matching 401k, company paid pension, stock purchase plan, tuition reimbursement and more! • Facility Amenities: On-site fitness center (free to employees) and daycare facility (competitive rates) Click Here to see our benefits What You Will Do • Operate and perform preventative maintenance and corrective maintenance/repair on high pressure boilers, turbines, high voltage generators, and auxiliary equipment at an on-site cogeneration plant that produces electricity • Other equipment maintenance includes coolers, steam chillers, air compressors, water softeners, fire pumps, distribution equipment and monitoring equipment, condenser water cooling towers • Troubleshoot equipment to find solutions; make repairs & modifications to equipment • Monitor control board and regulate equipment according to procedures and information obtained from recording and indicating instruments • Responsible for parts ordering and inventory • Other duties as assigned Position Details: • Location: Naperville, IL • Work hours: 4:00PM - 12:30AM, Sunday to Thursday • Compensation: $38 per hour to start increasing up to $42.50 in the first 2 years (increase every 6 months upon successful completion of training) • This shift has a $0.40 per hour shift differential. Minimum Qualifications: • High School Diploma/GED • 2 years of maintenance experience in an industrial or military environment OR a technical degree or diploma in a maintenance mechanical/electrical discipline ​ • Experience with pressure steam plant operations • Experience with absorption/steam chillers operations • Immigration sponsorship not available for this role Physical Demands: • Position requires climbing ladders • Position requires lifting 75lb • Position requires work in confined spaces, heat and at heights Preferred Qualifications: • Stationary Engineers License • Formal vocational training in plant maintenance activities with an emphasis on industrial applications or equivalent job experience in electricity, power distribution, industrial electrical wiring, mechanics, machine operations, general plumbing, heating ventilation, and air conditioning, boiler operations. • 1 year of experience with PLC based applications in an industrial environment • 1 year of plumbing, pipefitting, pump repair and rebuilding experience • Experience with pumps, welding, bearings, electrical safety, forklifts, gears, hydraulics, valves, and rigging. • Experience in a TPM or Lean Six Sigma environment • Refrigeration Certification • Welding experience • Snow Removal Experience Annual or Hourly Compensation Range: The starting pay rate is $38.00 per hour. Many factors are taken into consideration when determining compensation, such as experience, education, training, geography, etc. We comply with all minimum wage and overtime laws. Benefits Ecolab provides the following benefits: medical, dental, vision, life insurance, accident insurance, critical illness insurance, hospital indemnity insurance, auto insurance, home insurance, pet insurance, identity theft protection, short-term and long-term disability, 401k, pension plans, retirement health care benefits, short-term incentives, vacation (12 days), holidays, parental leave, employee stock purchase plans (Full-Time Associates), discount on day care services and caregiver services, adoption assistance, group legal services, employee assistance program, employee discount program, and education assistance program, on-Site childcare and fitness facilities may be available at select Ecolab locations. Click here  for additional benefits information.  If you are viewing this posting on a site other than our Ecolab Career website, view our benefits at jobs.ecolab.com/working-here . Potential Customer Requirements Notice To meet customer requirements and comply with local or state regulations, applicants for certain customer-facing roles may need to: - Undergo additional background screens and/or drug/alcohol testing for customer credentialing. Americans with Disabilities Act (ADA) Ecolab will provide reasonable accommodation (such as a qualified sign language interpreter or other personal assistance) with our application process upon request as required to comply with applicable laws. If you have a disability and require accommodation assistance in this application process, please visit the Recruiting Support link in the footer of each page of our career website.

Apply at Ecolab