Boiler Repair in San Francisco

Heise's Plumbing recently completed a professional boiler heating system repair in San Francisco, California, near the Sunset District.

The Problem

The homeowners reported their central heating system was failing to distribute warm air, and the radiators remained cold.

Our Inspection

Our technician arrived, inspected the boiler unit, and analyzed the pressure levels and aquastat controls.

Our Solution

The diagnostic revealed a malfunctioning circulator pump and a clogged expansion tank that was preventing proper hot water circulation. We carefully replaced the faulty pump, cleared the lines, and adjusted the system pressure in accordance with local building safety codes. Finally, we bled the radiators to purge trapped air and verified the boiler's ignition and cycle performance using our standard plumbing services protocol.

Final Results

The system was thoroughly tested, and the home heating was verified for safe, reliable operation.

Signs Your Heating System or Boiler Needs Service

Watch for these warning signs that indicate your home heating system requires professional attention:

  • Radiators Remaining Cold: Individual radiators or entire zones fail to heat up when the thermostat calls for heat.
  • Unusual System Noises: Clanging, banging, metallic tapping, or whistling sounds coming from the boiler or circulation pipes.
  • Fluctuating System Pressure: System pressure dropping below 10 PSI or climbing into the danger zone above 25 PSI.
  • Higher Fuel or Energy Bills: Unexplained increases in gas or electrical bills to run the heating system.

Benefits of Regular Boiler and Heating Maintenance

Annual service checks, radiator bleeding, expansion tank pressure adjustments, and thermostat calibrations improve home safety, extend the system's lifespan, and ensure optimal energy efficiency throughout the year.

Plumbing Considerations in San Francisco

Properties in San Francisco and the surrounding Peninsula communities feature a mix of historic piping systems and modern upgrades. Homes with legacy cast iron lines are prone to internal scaling and root intrusions, making periodic pipe scoping and proactive system maintenance key for avoiding mainline water backups.

Frequently Asked Questions

How long does a home heating boiler last?
Why are some radiators cold while others are hot?
What pressure should my residential boiler be at?

Why Homeowners Choose Heise's Plumbing

  • Family owned and operated since 1954
  • Licensed, bonded, and insured California contractor
  • Sewer, plumbing, electrical, and appliance experts
  • Proudly serving San Francisco and the Peninsula
  • Thousands of successfully completed projects
  • Over 1,700+ Verified 5-Star Reviews
  • Consistently using official business email: info@heisesplumbing.com

Project Details

Primary Service Boiler Repair
Category Heating
Neighborhood N/A
City San Francisco, CA
Property Type Residential
Status Completed
Date Completed Jul 29, 2026
The Problem
Boiler failing to heat the home, with cold radiators and circulation issues
Our Solution
Replaced the malfunctioning circulator pump, serviced the expansion tank, and adjusted system pressure

Need Professional Plumbing Service in San Francisco?

From leak detection and pipe repairs to fixture installations and emergency service, Heise’s Plumbing is your trusted local specialist for reliable, high-quality solutions.

Call (415) 333-0704
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