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.


