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Best boiler repair pros near Walnut, CA

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    Average homeowner rating
  • Verified reviews icon1.9k+
    Verified boiler repairs reviews

Top-Rated Boiler repair pros in Walnut - Updated Nov 2026

Avatar for HD MECHANICAL INC
HD MECHANICAL INC
4.9(
32
)
Gas Boiler or Radiator Heating System - RepairBoiler or Radiator Heating System - Install or ReplaceBoiler or Radiator Heating System - Install or Replace - For Business+13 more

Serving Walnut, CA and surrounding areas

Approved

Super Service Award Winner

In business since 2022

Free estimates

Emergency services offered

"This was by far the best experience I've had when it involves repairs. My heater had been broken for a year. Because I'm on a fixed income, I couldn't afford to replace it. Quotes from others all recommended replacement. HD Mechanical gave me an estimate for repair and it was fixed right away, an at a fair price. Brandon and Tim are the best and are professional and dedicated to getting the job done without trying to upsell to unnecessary replacement. It works fantastic. They also happened to fix my ac as well, with no cost to me. If you are a woman alone, hire this company. They're honest and fair, and provide great service"
Heating & A/C Project
Heating & A/C Project
Heating & A/C Project
Heating & A/C Project
Additional Photos

+14

Response time6 hrs
Response rate100%
55 neighbors recently requested a quote
Avatar for West Tech Mechanical Services
West Tech Mechanical Services
4.9(
97
)
Boiler or Radiator Heating System - Install or ReplaceBoiler or Radiator Heating System - Install or Replace - For BusinessBoiler or Radiator Heating System - Repair or Service+13 more

Serving Walnut, CA and surrounding areas

In business since 2008

Credit card accepted

"Joe was punctual, polite, and very helpful. He took a little while to diagnose the problem with the heating unit, but once he figured it out he had the part ready and the installation underway (he first told us what the part would cost and asked permission to go ahead with the repair- which I appreciated). He tested the unit when he was done to make sure it was the right fix, which it was. Then we asked if he could also look at the air conditioning unit while he was here, since it stopped working at the end of last summer. He took some more time to fix that one, which was even harder to diagnose. But, he kept testing until he found the problem, and in the end we had 2 operable units that will save us from another service call in the busy summer season. It was worth the money.
"
2.5 ton Trane furnace
Trane Condenser
Trane 10 ton President
Wall Heater
1964 Trane split system

+8

Recommended by95%of homeowners
Avatar for Precision Auto Works
Precision Auto Works
4.8(
43
)
Boiler or Radiator Heating System - Install or ReplaceBoiler or Radiator Heating System - Install or Replace - For BusinessBoiler or Radiator Heating System - Repair or Service+13 more

Serving Walnut, CA and surrounding areas

In business since 1994

Credit card accepted

"Repair was done on my daughter's car who is in college in California, I live in Colorado. The owner spoke with me on the phone prior to doing the repair to explain issues with car. His assessment was consistent with the problems my daughter described to me. The price was very reasonable for all the parts and labor. The job was completed quickly and they stayed past closing until my daughter could get there to pick up car. They accepted my payment over the phone and offered to check her fluids and inspect car periodically in the future for free. I think you will be very satisfied using this garage as this and other reviews have clearly shown.
"
Recommended by92%of homeowners
Avatar for Magnolia Heating & Cooling Inc
Magnolia Heating & Cooling Inc
4.7(
819
)
Boiler or Radiator Heating System - Install or ReplaceBoiler or Radiator Heating System - Install or Replace - For BusinessBoiler or Radiator Heating System - Repair or Service+13 more

Serving Walnut, CA and surrounding areas

In business since 1951

Free estimates

Warranties offered

"Just wanted to give a shout out to their tech Anthony, who is punctual and thorough, explains things well, and is always very kind and respectful of me and my home. Today he fixed a broken latch on my gate while doing the HVAC service, just because he had the tools with him and could do it. Really appreciate him."
Additional Photos
Additional Photos
Additional Photos
Additional Photos
Additional Photos

+17

Recommended by93%of homeowners
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Boiler Repair FAQs, answered by experts

Yes, cleaning a boiler is essential for its efficient and safe operation. Over time, boilers can accumulate dirt, rust, sediment, and mineral deposits, reducing efficiency, increasing energy consumption, and causing potential breakdowns. Cleaning involves removing these deposits from various components like heat exchangers, burners, and pipes. Neglecting cleaning can also lead to corrosion and decreased life span. Regular, yearly maintenance, including cleaning, ensures optimal performance, lower energy bills, and a safer heating system. It's best to consult the boiler's manual or hire a professional technician for cleaning to ensure the job is done right.

Deciding whether to repair or replace your HVAC system largely depends on its age, the cost of repairs, and its overall performance. If the system is over a decade old and requires frequent or expensive repairs (e.g., totaling over $5,000), replacement is often the more cost-effective choice, especially if the warranty has expired. It is usually worth repairing a newer system, but if it is approaching the end of its typical 15- to 25-year lifespan, replacement might be a better long-term investment. Signs that you may need a replacement include increased humidity, higher energy bills, uneven heating or cooling, and excessive dust. Before deciding, ask your HVAC contractor to check if any parts are covered under warranty, which could save you money on repairs.

A poorly maintained boiler can lead to serious issues like deadly carbon monoxide poisoning, so schedule regular maintenance services. Of course, it’s also a good idea to check your carbon monoxide detectors in your home to make sure they’re working properly. Moreover, when you forget to maintain your boiler, small problems can lead to something much more serious, which will cost you more money in the long run. Repairs average around $400, while a full replacement can total over $6,000.

Boiler leaks are the most common problem that impacts this fixture. Some leaks stem from corroded pipes and tanks, while others are due to damaged seals or excessive pressure. No matter how you slice it, boiler leaks are bad news. This issue leads to water damage in the home and malfunctioning electrical components in and around the boiler.

Most HVAC companies charge a flat service call fee of between $75 and $150, which includes traveling to your home and inspecting your system to find the underlying problem. Keep in mind that these prices only include diagnostics and the actual repairs will usually be billed separately. If you’re calling for routine service, the service call will be included in your inspection and tune-up, with the total sitting around $150. Your prices could be a little higher if you have a very large home with multiple condensers and air handlers, as inspections and servicing take longer.

The Walnut, CA homeowners’ guide to boiler repairs

From average costs to expert advice, get all the answers you need to get your job done.