Boiler Replacement Services
Top-Rated Boiler Replacement Services in Marin, Sonoma & Napa County
Is your old boiler costing you a fortune in repairs or just not keeping your home warm enough? At Ongaro & Sons, we understand the importance of a reliable and efficient heating system. We specialize in providing top-tier boiler replacement services tailored to the unique needs of homeowners from Marin, Sonoma, and Napa counties, as well as all the neighboring communities of the North Bay.
With decades of experience and a commitment to excellence, our Class C4 California licensed professionals ensure every boiler replacement is performed with precision and care, guaranteeing you lasting comfort and energy savings. We know a new boiler is a significant investment, which is why we offer no-obligation consultations to help you choose the best system for your specific needs and budget, making the process seamless and stress-free.
Our goal is to provide you with efficient, dependable, and long-lasting solutions. Trust Ongaro & Sons for expert boiler services that guarantee your home stays warm and cozy all year round.
Contact us at 415-741-2820 to request a boiler replacement estimate or request services online and experience the better service that comes with a multi-generational company like Ongaro & Sons.
Signs You Need to Replace Your Residential Boiler
Boilers are integral to hydronic heating systems. They offer a long lifespan and high efficiency, and some types require minimal or no pumping energy. A reliable boiler system is essential for maintaining a warm and comfortable home.
Knowing when to replace your residential boiler is crucial for maintaining efficiency, safety, and cost-effectiveness. Here are common signs indicating that your boiler may need to be replaced:
Age of the Boiler
Boilers typically last 15 to 20 years. If your boiler is approaching or has surpassed this age, consider a replacement, even if it still seems operational. Older models are less efficient and more prone to breakdowns.
Frequent Repairs
If your boiler requires frequent repairs, replacing it may be more cost-effective in the long run. Continuous breakdowns increase maintenance costs and the risk of complete failure.
Rising Energy Bills
An increase in your energy bill could indicate your boiler is no longer running efficiently. As boilers age, they often lose their efficiency, requiring more fuel to produce the same amount of heat.
Inconsistent Heating
If some rooms are too hot while others are too cold, your boiler might need help distributing heat evenly. This uneven heating can be a sign that your boiler is no longer functioning correctly.
Unusual Noises
Banging, clunking, or whistling noises can indicate serious internal issues, such as parts wearing out or components failing. These sounds often signal that a replacement is needed to avoid a complete system breakdown.
Yellow Flame
Your boiler’s flame should be blue. A yellow or flickering flame can indicate carbon monoxide production, which is dangerous and suggests the boiler is not burning fuel properly.
Leaks and Corrosion
Visible signs of water leakage or corrosion around your boiler are clear indicators that it may need to be replaced. Leaks can cause significant damage to your property and signal internal degradation.
Addressing these signs promptly can help you avoid more significant issues and ensure your heating system remains efficient and safe.
Comprehensive Boiler Replacement Services in Marin, Sonoma & Napa County
Replacing a boiler involves more than just swapping an old unit for a new one. It requires careful planning, precise installation, and thorough testing to ensure optimal performance and safety.
We provide professional plumbing services and boiler replacement to residents of Sonoma, Marin, and Napa Counties. Our boiler replacement services include:
- Initial Consultation and Assessment: Our process begins with a thorough evaluation of your current heating system and a detailed discussion of your heating needs. We consider factors such as your home’s size, heating preferences, and budget to recommend the best boiler system.
- Boiler System Selection: We offer a wide range of high-efficiency boilers, helping you select a model that meets your heating requirements and maximizes energy efficiency. Our technicians are knowledgeable about the latest advancements in boiler technology, ensuring you receive a reliable and cost-effective system.
- Professional Installation: Our Class C4 licensed and licensed plumbing technicians install with precision and care. We ensure all connections are secure, the system is calibrated correctly, and safety protocols are strictly followed. Our team works diligently to minimize disruption to your home during installation.
- Testing and Verification: We conduct comprehensive testing after installation to ensure your new boiler operates efficiently and safely. We check for proper airflow, correct thermostat settings, and overall system performance to guarantee your comfort and satisfaction.
- Post-Installation Support: Our commitment to you doesn’t end with installation. We can provide ongoing maintenance services to keep your boiler running smoothly for years. Regular maintenance and keeping on top of repairs help prevent unexpected breakdowns, extend the lifespan of your boiler, and ensure optimal efficiency.

Ongaro & Sons for Boiler Replacement in Marin, Sonoma & Napa County
Finding a qualified plumber is crucial for any plumbing service in the North Bay. If you think finding the right one is expensive or overwhelming, you haven’t experienced Ongaro & Sons.
Fully licensed and certified, we provide competitive prices for top-notch plumbing installations and repairs. Serving the North Bay for four generations, excellent service is our legacy.
Choosing the right company for your boiler replacement ensures a hassle-free experience and long-term satisfaction. Our well-earned reputation includes:
- Decades of Expertise: With nearly a century of service, Ongaro & Sons has a proven track record of excellence. Established in 1932 by Ernest V. Ongaro, we have become a trusted name in the North Bay area, particularly across Marin, Napa, and Sonoma counties.
- Family-Owned and Operated: Our family-run business is built on integrity, reliability, and quality. We stand by our work and treat each customer like family, ensuring personalized and attentive service.
- Highly Qualified Staff: Our technicians are certified through the Plumbing Heating Cooling Contractors Association (licensed) and hold a Class C4 boiler contractor’s license, ensuring they have the skills and knowledge to handle any boiler replacement project.
- Ongoing Training: We invest in continuous education for our technicians so they can stay updated with the latest industry standards and technologies. This commitment to education ensures we provide the best solutions for our customers.
- Diamond Certified® and BBB A+ Rated: Our dedication to quality and customer satisfaction has earned us prestigious certifications and high ratings from trusted organizations.
- Guaranteed Work: We stand by our work with a 100% satisfaction guarantee. If you’re not completely satisfied with our services, we’ll make it right.
- Flat Rate Pricing: With our flat rate pricing, you can trust that you’ll receive transparent and fair pricing for our services. We charge by the job, not by the hour, so there are no surprise costs.
- Latest Technology: We utilize the latest technology in heating and cooling to provide efficient and effective solutions. Our technicians have state-of-the-art tools and equipment to deliver the best results.
- Comprehensive Services: Besides boiler replacement, we offer a full range of plumbing, electrical, heating, ventilation, and cooling services. Our Ongaro Maintenance Plans is designed to keep your home’s systems running smoothly.
- High Level of Repeat Customers and Referrals: Our commitment to quality service has earned us a loyal customer base and numerous reviews throughout Marin and Sonoma counties.
- Friendly and Responsible Technicians: Our technicians undergo thorough background checks and are trained to provide friendly, respectful, and professional service.

Schedule Your Boiler Replacement Service
Whether you’re replacing an aging boiler or upgrading to a high-efficiency system, our experienced team is ready to help you stay warm and comfortable. We proudly serve Sonoma, Marin, and Napa counties, including Santa Rosa, San Rafael, Novato, and surrounding cities. Call us now at 415-741-2820 or book your appointment online for fast, reliable boiler replacement service you can trust.
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 Marin, Sonoma and Napa County. 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.
Licensed, Insured, Background-Checked
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, with no surprises.
Since 1932
Why Ongaro & Sons for Boiler Replacement
A new boiler on an old system inherits every fault that system already had.
Schedule Service →C-4 boiler and steam fitting licensed
Boiler replacement sits inside our own licence, including the gas work it depends on.
The system gets assessed, not just the appliance
Emitter sizing, circulation and water quality decide whether a condensing boiler ever reaches its rated efficiency.
Sized to the actual heat loss
Most replaced boilers were substantially oversized. Correct sizing improves comfort and running cost at the same time.
Flushing and water treatment where the system needs it
Putting a new heat exchanger onto a dirty system is the most reliable way to shorten its life.
Commissioned, not just installed
Combustion is set and recorded, controls are configured, and the system is balanced before we leave. An uncommissioned boiler never reaches its rated efficiency.

Discount
Membership
Ongaro Maintenance Plans
Annual maintenance on your home systems provides safeguards and comfort to you and your family. Members get priority scheduling, discounts, and proactive checkups that catch problems early.
Member Discounts
5% off every repair and replacement, all year long.
Peace of Mind
Proactive checkups catch issues before they become big problems.
Courtesy Reminders
We call you to schedule: never miss a seasonal service.
Value That Lasts
With Ongaro & Sons, you’re investing in quality, integrity, and service that stands the test of time. Explore our current promotions and see the difference real value makes for your HVAC, plumbing, and electrical needs.
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Read MoreFrequently Asked Questions
Can I upgrade to a high-efficiency boiler?
Yes, modern boilers are more compact and energy-efficient, saving you money on fuel bills.
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.
What are signs my boiler needs repair?
No heat, water leaks, strange noises, or frequent cycling on and off are all red flags.