What are the most common boiler problems we diagnose?

The most frequent issues are low system pressure, faulty thermostats and zone controls, kettling caused by mineral scale on the heat exchanger, ignition or pilot light failures, and circulator pump faults. On hydronic systems, air trapped in the loop and stuck zone valves are also common. Our technicians work through a structured diagnostic check on pressure, combustion, and electrical controls before recommending a repair.

Why does my boiler keep losing pressure?

Pressure drop is usually caused by a small leak in the system, a failing pressure relief valve, a waterlogged expansion tank, or air bleeds left open. If you have to refill the boiler more than every few months, the underlying cause needs to be found rather than just topped off. Repeated refills introduce fresh oxygenated water that accelerates internal corrosion.

Do you service both gas and high-efficiency condensing boilers?

Yes. Our plumbing team services natural gas, propane, and high-efficiency condensing boilers, including unit-specific work on heat exchangers, condensate traps, flue venting, and modulating gas valves. All boiler work is performed under our California Contractors License #215233 (C-36 plumbing) by Ongaro & Sons technicians.

Boiler Repair | Marin, Sonoma & Napa

Q: Can hard water affect my boiler's performance?

Yes. Mineral buildup can reduce efficiency and cause overheating. Water softening can help extend your boiler's lifespan.

Q: Can I upgrade to a high-efficiency boiler?

Yes. Modern boilers are more compact and energy-efficient, saving you money on fuel bills.

Q: How long does a boiler last?

A well-maintained boiler can last 15 to 30 years. Frequent repairs, rising bills, or uneven heating may signal it's time to replace.

Q: Is it safe to run a leaking boiler?

No. Turn it off and call a technician. Leaks can cause pressure loss, corrosion, and water damage.

Is your boiler making strange noises or just not getting the job done?

Boilers are durable systems, but like any mechanical equipment, they can develop issues over time due to wear and tear, mineral buildup, leaks, or faulty components.

Whether you’re facing minor issues or a complete boiler breakdown, the skilled and Class C4 licensed contractors at Ongaro & Sons are prepared to handle all your repair needs. Our dedication to quality work and customer satisfaction guarantees you the best care possible. We provide comprehensive boiler repair services tailored to the unique needs of our customers.

Contact us at 415-741-2820 to schedule a boiler repair appointment or request services online and experience the better service that comes with a multi-generational company like Ongaro & Sons.

Affordable Boiler Repair in Northern California With Ongaro & Sons

With nearly a century of combined industry expertise, Ongaro & Sons recognizes the importance of a fully operational boiler for homeowners throughout Northern California, including Sonoma, Marin, and Napa counties. We take pride in offering prompt, reliable, and efficient boiler repair services.

Our highly trained technicians are equipped to repair all major boiler makes and models, whether gas, electric, or high-efficiency systems.

Almost done. Worker set up electric heating boiler at home.

Signs You Need Boiler Repair

Unusual Noises or Strange Smells

Banging, whistling, or gurgling noises can signal air in the system, low pressure, or a faulty pump. Likewise, metallic, burning, or gas-like odors may point to overheating components or a gas leak—both require prompt professional attention.

Inconsistent Heating or Low Pressure

Pilot Light and Error Codes

Water Leaks and Rising Bills

Your Comfort, Our Priority

Ongaro & Sons is your trusted heating, cooling, plumbing, electrical, and solar expert—specializing in reliable maintenance and repair services that keep your home running efficiently year-round.

Our certified technicians deliver unmatched expertise with fast, friendly service across Northern California. From HVAC tune-ups to plumbing repairs and electrical upgrades or solar solutions, we focus on energy-efficient performance and long-term comfort. Count on us to maintain the systems that power your home and keep your environment just the way you like it.

Schedule Service

PHCC- and NATE-Certified Experts

Our technicians are licensed, experienced, and trained to service all makes and models.

Locally Owned and Operated

Serving the Napa, Marin, and Sonoma communities with personalized, hometown service.

Reliable Repairs

We respond quickly and get the job done right the first time—no surprises.

Our Comprehensive Boiler Repair Services

Boilers are complex systems that require expert care to maintain functionality and safety. Our team at Ongaro & Sons is well-versed in diagnosing and repairing all types of boiler problems throughout Northern California.

Here are some of the key boiler repair services we offer:

Boiler Diagnosis and Troubleshooting

Our skilled technicians begin by thoroughly inspecting your boiler to identify the root cause of any issues. We utilize advanced diagnostic tools and techniques to pinpoint problems accurately, ensuring our repairs are both effective and long-lasting.

Boiler Leak Repairs

Boiler Pressure Issues

Thermostat and Control Repairs

Boiler Component Replacement

Pilot Light and Ignition Repairs

Boiler Cleaning and Maintenance

Why Northern California Homeowners Choose Ongaro & Sons for Boiler Repair

Choosing the right service provider for your boiler repair needs is crucial for ensuring quality work and lasting results. Here’s why Ongaro & Sons stands out as the best choice for boiler repair in Marin, Sonoma, Napa, and all the neighboring communities:

Long-standing Reputation

Established in 1932 by Ernest V. Ongaro, Ongaro & Sons has built a solid reputation over the years as a trusted provider of HVAC and plumbing services. As a family-owned and operated business, we take pride in delivering exceptional service and standing by our work.

Certified Expertise

Our technicians are highly trained and hold certifications from reputable organizations, including the Plumbing Heating Cooling Contractors Association (PHCC), which reflects our commitment to maintaining the highest standards in the industry. We also hold a Class C4 California license, which validates our proficiency in installing, maintaining, and repairing boilers, hot water heating systems, and steam fittings.

Quality and Reliability

Customer Satisfaction

Transparent Pricing

Trusted Technicians

Comprehensive Services

Community-Focused

Contact Ongaro & Sons for Residential Boiler Repair Near You

When your boiler requires professional repair, trust Ongaro & Sons to deliver prompt, reliable, high-quality service. With our experienced team, you can rest assured that your boiler is in good hands.

If your boiler needs repair in Sonoma, Marin or Napa Counties, the boiler experts at Ongaro & Sons are here to help! Contact us today at 415-741-2820 to schedule a repair or to learn more about our comprehensive boiler repair and plumbing solutions or request services online.

5%

Member Discount

Ongaro Maintenance Plans

Annual maintenance on your home systems provides safeguards and comfort to you and your family. Neglecting your routine checkups can potentially put everyone at risk.

With these annual visits, our experienced technicians use the latest technology to help find unsafe problems before they can become bigger problems.

Maintenance Plans