Boiler Repair & Maintenance in San Francisco, CA

When your boiler breaks down in the middle of the night, you’ll be left shivering in the cold. Suddenly, you’re left boiling water on the stove to warm your hands and wondering how long you can go without heat. For residents in San Francisco, where chilly mornings and foggy nights are part of life, a well-maintained boiler is a must-have. The truth is, boilers don’t give obvious warnings before they fail. Small leaks, odd noises, or fluctuating heat often go unnoticed. Ignoring them could mean higher energy bills or even complete system failure that forces you to consider a full boiler installation sooner than you planned.

If you’re in need of urgent boiler repair, trust Flow Masters Plumbing — the local experts in heating services who understand the unique challenges of San Francisco homes. We’ve been helping homes like yours since 2011. From winning awards from Lochinvar®, a major boiler manufacturer, to being the designated plumbers for the San Francisco Decorator Showcase House, we’ve proven we know boilers inside and out. Plus, we offer benefits like a 1-year workmanship guarantee, financing options, and support for rebate programs to make things easier for you.

Call Flow Masters Plumbing at 415-751-1933 or book an appointment online and let’s get your home warm and comfortable again.

Boiler Repair Services To Keep San Francisco Homes Warm and Cozy

Comprehensive Boiler Diagnostics and Repairs

Leaks

Boiler leaks are warning signs that something serious might be happening within your system. Water leaking from pipes or valves could mean there’s corrosion, high pressure, or even broken seals. Using thermal imaging and pressure-testing tools, we accurately find these problem areas to fix these issues early so you can avoid bigger problems like structural damage or skyrocketing water bills.

Pressure Problems

Ever noticed your boiler’s pressure gauge going too high or dropping too low? That little dial holds a lot of weight. Pressure problems can be caused by blockages, broken relief valves, or even issues with the expansion vessel. With our boiler repair and maintenance, we use the right equipment to find where the issue is and do accurate fixes, from bleeding air out of radiators to replacing damaged components.

Malfunctioning Burner

A burner that won’t ignite or one that burns unevenly means your boiler can’t heat your home enough. Issues like a clogged burner, a broken thermocouple, or inconsistent gas flow can compromise heat output. Our certified contractors can clean and recalibrate the burner, inspect the ignition system, and test gas lines for proper flow.

Emergency Boiler Repair Services Available 24/7

Flow Masters Plumbing is available 24/7 for any urgent issues regarding your boiler. Our emergency boiler repair services are available anytime you need them within the Bay Area. Our certified contractors arrive ready to work with the tools and replacement parts to address most issues on the spot.

Boiler Maintenance and Tune-Ups

Our boiler service and repair covers comprehensive tune-ups that include cleaning heat exchangers, recalibrating pressure settings, and checking all major components for wear.

Client Testimonials

- Michael Stanley

"Great service from both Alberto & Connor repairing our radiant heat boiler & restoring heat & hot water. Thankful for your help!"

- Nora Bowers

"Conor was incredibly knowledgeable and responsive! I struggled to find anyone who knew about our type of boiler and finally found Flow Masters after a lot of calling around. Conor helped us navigate repairing vs replacing our boiler, while I was in the hospital and I came home to nice hot water after weeks of issues, prior to finding them. Would definitely recommend them to anyone looking for quality craftsmanship and a friendly team to work with."

- VdubSF

"We had an issue with an old boiler made by HTP. They came diagnosed and repaired a problem that a couple of other companies couldn’t solve. They were professional and easy to deal with."

- Nicole Agostinelli

"Flow Masters are the best!! If you have a radiant heat system or a boiler they are your people! They have been servicing my radiant system and NTI boiler for years and it’s never missed a beat!"

- Fergal Mac donnell

"My radiant heat system had some zones that were not working and they replaced some valves of some sort. What a relief ! Finally we have heat all the way through the house.. my kids are super happy! They also did a maintenance on my boiler and said I should really be done once a year. Seemed like a good crew. I’m planning to get them back every year now to service my system"

- Fergal Mac donnell

"My radiant heat system had some zones that were not working and they replaced some valves of some sort. What a relief ! Finally we have heat all the way through the house.. my kids are super happy! They also did a maintenance on my boiler and said I should really be done once a year. Seemed like a good crew. I’m planning to get them back every year now to service my system"

- Sean Tully

"I have a unique HTP boiler instead of a typical water heater and recently it stopped producing hot water and maintaing the temperature. I called a few places in the East Bay, and they all said they were not qualified to fix that type of boiler that I had. An HTP sales rep referred me to Flow Masters and things immediately changed for the better."

- Shannen Gormley

"Highly recommend this company. Oisin in particular came out to service our boiler, he was very polite and friendly and done a tidy job with no problems. Thanks again."

- Nora Niebruegge

"Flow Master plumbing came to the rescue again when our hot water heater broke. They’re experts in boilers and their whole team is amazing - efficient, friendly and thorough. I have recommended them to friends and would definitely recommend them to anyone with hot water issues."

Boiler swap out in Palo Alto last week Complete boiler system HTP ELU 150,000 btu boiler and Lochinvar dual coil indirect storage tank with two 8x4 thermal solar panels on roof - existing HTP p

Our Process for Delivering 5-Star Boiler Repair Service

Initial System Assessment and Diagnosis

Our technicians check the heat exchanger for signs of wear, examine burners for blockages, and test control systems for proper function. For those in need of San Francisco boiler repair, this assessment is important to lay the foundation to give you the best service.

Component Testing

Pressure levels are measured to detect fluctuations that could affect performance. We analyze fuel supply lines to confirm consistent flow and test ignition systems for proper operation.

Custom Repair Solutions

We customize every boiler heater repair service based on the make and model of your system. This could involve cleaning and recalibrating the burner, replacing damaged seals, or upgrading outdated components.

System Recalibration and Safety Checks

Safety is a priority at Flow Masters Plumbing, so we test for gas leaks, confirm pressure stability, and ensure every part is operating as intended.

Post-Repair Maintenance Recommendations

We don’t stop at fixing the issue. After every job, we guide homeowners on keeping their boilers in great shape. From practical tips to scheduling regular maintenance, this extra step can save you from problems that could have been prevented.

Annual Boiler Maintenance

Boiler maintenance should be handled by a skilled technician or an experienced company like Flow Master Plumbing to ensure safety and efficiency. Following the manufacturer’s recommended maintenance schedule is also essential for preserving the warranty and maintaining optimal performance. Contact us today at 415-751-1933 or book an appointment online to schedule Boiler maintenance.

Boiler annual Maintenance
removing mineral deposits (scale) that build up inside the boiler over time
During regular boiler maintenance, technicians inspect the burner assembly for signs of wear and tear, such as cracks, corrosion, or blockage.

Heating Homes Across The Bay Area with Expert Boiler Services from Flow Masters Plumbing

Boilers are complex systems and small issues like uneven heating or strange noises often point to bigger problems that no DIY remedies can solve. Since 2011, we’ve been helping Bay Area families stay warm with expert boiler repair services. We’ve been featured as the designated plumbers for the San Francisco Decorator Showcase House, and regularly host manufacturer-led seminars to stay ahead of industry advancements. Call 415-751-1933 or book an appointment online today and experience why we’re a 5-star rated team trusted throughout San Francisco, CA.