Boiler Replacement Cost in San Francisco, California
Expect to pay $7,700 to $17,500 for boiler replacement in San Francisco, CA. Most homeowners end up near $13,100, depending on the equipment tier and how much of the old setup can be reused.
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San Francisco Weather and HVAC Load
In a normal year, San Francisco racks up 3,260 heating and 29 cooling degree days (NOAA 1991-2020 normals). Heating is the bigger job here, and furnaces and heat pumps in San Francisco put in far more hours than the air conditioner. Temperatures stay mild year-round: freezing nights and 90°F days are both rare. For a 2,000 sq ft house, this climate points to a heating load somewhere near 45,000 BTU/h. Treat that as a starting number. A Manual J calculation will move it up or down based on insulation and windows.
| Heating degree days / year | 3,260 |
|---|---|
| Cooling degree days / year | 29 |
| Nights at or below 32°F | 1 |
| Days above 90°F | 1 |
| Average low / high | 50.6°F / 61.7°F |
San Francisco Housing Stock
Census figures put the median build year in San Francisco at 1945, so a typical house here has about 81 years on it. Many houses that age were built with hot-water or steam heat, and plenty still run cast-iron boilers and radiators. About 140,000 households here own their home, 38.5% of the occupied total. Homes here have a median value of $1,380,500 and households a median income of $141,446. Those two numbers drive the labor adjustment in our estimate.
San Francisco County had 3 hail days and 4 days with damaging thunderstorm winds from 2020 through 2025, according to NOAA storm records. Storms here are more likely to cause power surges than coil damage, so a surge protector on the outdoor unit is worth the small cost.
When Replacement Makes Sense
- The pilot or ignition keeps failing
- Some radiators stay cold
- Leaks, rust, or pressure that keeps dropping
- Fuel bills keep going up
What Moves the Price
- Condensing or non-condensing boiler
- A combi boiler that also makes your hot water
- Fuel type: gas, oil or propane
- A new chimney liner or venting
- Pumps, zone valves and the piping around the boiler
We raised the national figures about 40% for San Francisco using local income, home values and the equipment size this climate needs. Real bids can still come in outside the range, so collect three written quotes.
What the Quote Should Cover
- Startup and safety tests
- Flushing and refilling the system
- Venting and fuel hookups
- Removing the old boiler
- The new boiler and the piping around it
California Permits, Efficiency Rules and Rebates
California is in the DOE's Southwest region, where new split central air conditioners need at least 14.3 SEER2 (13.8 SEER2 for systems of 45,000 BTU/h and up). The Southwest also sets a minimum EER2, which measures efficiency at peak heat. Plan on a mechanical permit for most replacements in San Francisco; the contractor normally pulls it. Before you sign, ask each bidder for their California license or registration number and proof of insurance. The federal 25C tax credit ended for equipment installed after December 31, 2025, so incentives now come mostly from utilities and state programs. Check your electric and gas utility's rebate page before you pick equipment.
Before You Hire
- For a steam system, hire a contractor who works on steam regularly.
- Ask for a heat-loss calculation. A lot of old boilers are much bigger than the house needs.
- A combi boiler frees up space and replaces your water heater.
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Boiler Replacement Questions from San Francisco Homeowners
How much is boiler replacement in San Francisco?
Plan on $7,700 to $17,500, with most jobs near $13,100. Equipment efficiency, house size and the condition of the ducts and wiring decide where your quote falls.
When is the best time to schedule boiler replacement in San Francisco?
Between late spring and early fall. San Francisco averages 1 freezing nights a year, and heating calls spike from November through February.
How long does a boiler last?
A cast-iron boiler can last 25 to 35 years. A modern condensing boiler usually lasts 15 to 20 with yearly service.
Can I replace a boiler with a heat pump?
Yes, with an air-to-water heat pump or a ductless system. The radiators may need upgrading, because heat pumps run cooler water than boilers.
Boiler Replacement Near San Francisco
- San Jose $7,200 to $16,400
- Fresno $5,300 to $12,000
- San Diego $6,900 to $15,700
- Sacramento $5,900 to $13,400
- Los Angeles $6,600 to $14,900
- Long Beach $6,300 to $14,300
- Oakland $7,300 to $16,600
- Bakersfield $5,400 to $12,300
Sources: U.S. Census Bureau ACS 5-year estimates 2019-2023 and 2024 population estimates; NOAA NCEI U.S. Climate Normals 1991-2020, station San Francisco Oceanside; NOAA Storm Events Database 2020-2025, San Francisco County. Prices are our estimates, not contractor quotes. Updated 2026.