Heating or plumbing emergency? We’ve got you covered!

Residential Boiler Repairs in Chicago, Illinois

A functioning boiler is essential when you need to stay warm during Chicago’s cold winter nights. If your boiler starts acting up, you might be tempted to double up on socks and blankets just to stay comfortable while you wait for repairs.

Don’t wait and suffer in the cold. Instead, you need to call a company that can provide efficient and reliable heating services in Chicago. With over a hundred years of HVAC experience, Deljo Heating, Cooling & Plumbing has been called one of the premier heating and cooling companies in the city. It is easy to see why anyone needing boiler repair in the Chicago area would want to choose Deljo.

Most boiler systems rely on a thermostat to signal when it’s time to begin heating the water to provide heat to the home. If your home is no longer producing heat properly, give us a call so that we can diagnose the issue. Our work speaks for itself. After a single visit, we’re confident that we’ll always be your first call for boiler repair in Chicago and the surrounding areas.

Water leaks onto a concrete floor near a boiler, wrenches, and copper pipes.

Types of Boilers

There are two main types of boilers. The main difference between the two designs boils down to the location of the heat source and the water.

Firetube boilers

Firetube boilers feature a central tube that fills with hot gasses from a burner. This central tube (the firetube) is surrounded by water that turns heat into steam through conduction. It will then make its way through your home to provide heat. These steam boilers are typically less expensive and take up less space than their water tube counterparts.

Watertube boilers

As the name suggests, water tube boilers fill their central tube with water. The water heats via convection thanks to the hot flue gasses which surround the tube. Watertube boilers tend to be more efficient and are commonly used in process industries.

Combi boilers

Acting as both a boiler and a water heater, combi boilers provide central heat to your home and provide hot water to taps. Combi boilers heat water on demand, eliminating the need for a storage tank. This makes them rather efficient, however, combi boilers can struggle to simultaneously provide hot water to multiple taps.

Looking for furnace or boiler repair in Chicago? Contact Deljo!

We offer standard and emergency boiler repairs in Chicago and the greater Chicagoland area. We’ll be there even if you need us in the middle of the night. To avoid the hassle and costs of emergency repair services, it’s important to have your boiler serviced every 12 months.

So when you need a heating system or boiler repair in Chicago and the surrounding areas, be sure to give us a call to schedule an appointment today! Our technicians are ready to help you day or night.

Client Testimonials

Read the opinions of our satisfied customers.

5 stars

This was my first time as a Deljo customer, and I was very pleased. My technician, Giovanni, was very thorough and diligent. He serviced my furnace and identified a faulty sensor that was causing the unit to shut itself down. Deljo ordered the part, and Giovanni replaced it a few days later. Overall, the team at Deljo was great. The dispatcher kept me informed about Giovanni’s arrival time, and the supervisor assisted Giovanni when he was diagnosing the problem with the furnace. I highly recommend Deljo.

Paul D. 10/15/2026

5 stars

I’ve used Deljo for over 10 years now and they always do a good job. Izzy was the technician for this visit and he did an excellent job with my winter maintenance on my multiple units in the household. He also addressed an issue while cleaning the furnace blower wheel. His communication was clear and concise with what he planned to do to address the issue quickly. He was confident and I had 0 concerns or questions. Great job Izzy!

Jeff S. 10/14/2026

5 stars

Paul was great! Arrived on time and completed maintenance on my humidifier, tankless water heater, and two furnaces. All work was performed under my Gold Star maintenance program, so all maintenance charges were covered. Paul did provide a few proposals for additional services on furnace & tankless water heater, but those were emailed to me for further consideration. Paul was friendly, knowledgeable, and answered all my questions.

Jack N. 10/12/2026

5 stars

Gabe did an excellent job with our annual service visit. He arrived in the early part of our service window, was friendly and knowledgeable, and got the work done in a very reasonable amount of time. I have great confidence in Deljo, and am a long-time customer.

Ruth C. 10/9/2026

5 stars

I’ve been using Deljo for 20 years for HVAC but now venture into enlisting their plumbing services. Bashar was very courteous, efficient & informative, and I’d definitely request him again for the next plumbing job. Great experience!

Christopher R. 10/2/2026

5 stars

Working with Deljo is always a good experience, and today’s appointment with Izzy was no different. He was able to come early which actually worked better with our schedules, but called me ahead of time to make sure that was okay. He was friendly and knowledgeable when he explained the work he had done during his visit and our options for fixes. He was also able to schedule a quote appointment for us while he was still here. We would highly recommend working with Izzy and the Deljo team!

Lauren H.  9/25/2026

5 stars

Drew performed the seasonal maintenance on my AC. It needed some repairs and updates and he was able to fix everything at the same appointment. He also noticed issues with the hot water heater and we were able to get ahead of that, as well.

Emily W. 9/11/2026

5 stars

I would leave six out of five stars if I could! My technician Jorge went above and beyond on his service. There was buildup in the rental property’s toilet from the previous tenant. One maintenance person did a surface level job of cleaning but did not fully remove the obstruction. Jorge went above and beyond and came to a solution and even explained the perpetual problems older toilet models can cause. Moving forward with this insight, I can perform my own upkeep the previous tenant did not. Thank you kindly!

Kayla K.  9/15/2026

5 stars

We just had our new boiler installed by Jonathan and Carlos. First rate work! They arrived on time, removed the old boiler, installed the new unit, and explained the features. Both guys were pleasant. Bring on the cold this winter! We are ready thanks to the team from Deljo.

Edward B.  6/26/2026

5 stars

Deljo’s heating and cooling team was awesome to work with. As a first-time homeowner, I really appreciated how clearly they explained everything and answered all my questions. From the quote to the install and follow-up, the service was top-notch. Highly recommend!

Lindsey A. Chicago, IL

5 stars

Matt did an amazing job. He serviced our home and our rental property. He gave us options to help our systems run more efficiently. He also told us about Deljo’s new plumbing inspection which was very affordable. He is great!

Jordan R. Chicago, IL

5 stars

We had a problem with our Humidifier and called Deljo. Jesus came out to help and was amazing. He was extremely knowledgeable, detail oriented, and super courteous. Amazing customer experience!

Jeff C. Chicago, IL

5 stars

Jordan and Jesus were extremely helpful and knowledgeable! We would 100% work with them and have them back. They were both very professional and efficiently fixed our heating system.

Emily L. Chicago, IL

5 stars

Shout out to Ernesto for coming out and servicing our furnace and air con. Deljo provides a great service and glad to trust them with our HVAC for our small business.

Lauren H. Chicago, IL

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