Boiler and hydronic heating · San Francisco
Boiler repair and service in San Francisco, from gas boilers to steam heat.
Lutz Plumbing repairs and services hot-water, steam, and combi boilers in San Francisco houses, flats, and apartment buildings. We diagnose no-heat, pressure, burner, control, pump, and valve concerns, service boilers before the heating season, and recommend repair or replacement based on the system's condition.
Quick answer
Boiler and hydronic problems need a system-level diagnosis.
A no-heat, uneven-heat, pressure, or leak concern can begin at the boiler, but it can also involve controls, a circulator, valves, piping, radiators, baseboards, or radiant heat. We evaluate the connected system before recommending a repair, maintenance, or replacement path.
Suspect a gas leak?
Leave the area and call 911. Then call PG&E at 1-800-743-5000. Do not treat a suspected gas emergency as a routine service request. See PG&E's gas-safety guidance for the current instructions.
No heat or uneven heat
A boiler problem can start at the appliance, a control, a circulator, a valve, or the hydronic distribution system. We inspect the system rather than assuming the boiler alone is at fault.
Pressure changes or water near the boiler
A pressure concern or visible water can involve a valve, pump, expansion component, connection, or the boiler itself. The location and operating condition help determine the next step.
Noise, resets, or inconsistent operation
Banging, cycling, ignition, burner, or control concerns need a diagnosis before a repair or replacement recommendation is made.
An aging system needs a clear plan
Maintenance can extend the useful life of a serviceable system. When replacement is the better path, we explain the condition, the options, and the scope that changes the work.
What the first visit should answer
Find the source before choosing the scope.
The goal is not to attach a boiler label to every heating symptom. It is to identify the affected equipment and explain the appropriate next step.
Identify the system and symptom
We start with the equipment, the heat-distribution system, the reported symptom, and any history of repeat repairs or maintenance.
Inspect the working components
The inspection can include the boiler, controls, pressure, burner, pumps, valves, piping, radiators, baseboards, or radiant-heating components that relate to the concern.
Explain the repair or replacement path
You receive the findings and the factors that affect the recommendation before work beyond the diagnostic scope begins.
A clear decision path
Repair when it is sound. Replace when the evidence supports it.
We do not use age alone as a replacement recommendation. The condition of the boiler and the connected heating system determines the conversation.
Repair a serviceable component
A control, circulator, valve, burner-related concern, connection, or localized leak can sometimes be repaired when the larger system remains a sound fit for the home.
Maintain a working system
Regular inspection can help catch pressure, control, valve, pump, burner, and distribution concerns before they become a no-heat call.
Plan a replacement when the evidence supports it
A leaking boiler vessel, repeat failures, unavailable parts, performance concerns, or a system that no longer fits the home can change the conversation from repair to replacement.
Boilers we service
Hot-water, steam, and combi boilers in San Francisco buildings.
San Francisco has every generation of boiler, from steam systems in pre-war flats to wall-hung combi units. The system type changes what we check and how we repair it.
Hot-water boilers
Hot-water (hydronic) boilers heat water and circulate it to radiators, baseboards, or radiant floors. Service covers the boiler, the circulator pumps, the expansion tank, the pressure and relief valves, and the zone controls.
Steam boilers
Many older San Francisco houses and apartment buildings still heat with steam. Steam systems have their own concerns: the water level and low-water cutoff, the pressure control, the main vents and radiator vents, and the pipe pitch that lets condensate return. We work on steam boilers and the radiators they feed.
Combi and high-efficiency boilers
Combination boilers heat the house and the domestic hot water from one unit, typically wall-hung. We are an Authorized Service Representative for Viessmann, Navien, and Rinnai, so service and repair follow the manufacturer's procedures and parts.
Annual boiler service
Service the boiler before the first cold night.
Heating calls pick up when the weather turns cold. A yearly service before the heating season is how small problems get found while they are still small. Radiators that stay cold or bang are covered on our radiator repair page.
- Burner and combustion check, and the venting that carries combustion gases out
- Safety controls: the relief valve, limit controls, and on steam boilers the low-water cutoff
- System pressure, the expansion tank, and the fill and pressure-reducing valves
- Circulator pumps, zone valves, and thermostat calls on hot-water systems
- Water level, sight glass, and vents on steam systems
- Findings explained before any repair is recommended
What changes the scope
The equipment, diagnosis, access, and system connections drive the work.
We inspect before recommending a larger project. These are the factors that can change the time, equipment, coordination, and price.
Related heating systems
The boiler may be one part of a larger heating system.
If the concern is in the distribution system or the home is considering a different equipment path, these related services explain the adjacent scope. We keep the recommendation tied to the system that is actually installed.
Boiler service questions
Know what a boiler visit should clarify.
The first conversation should make the symptom, system, safety boundary, and potential scope clearer.
Who repairs boilers in San Francisco?
Lutz Plumbing repairs and services hot-water, steam, and combi boilers in San Francisco, and has served the city since 1929. We work in houses, flats, and apartment buildings, and we are an Authorized Service Representative for Viessmann, Navien, and Rinnai. Every repair starts with a diagnosis of the boiler and the system it feeds.
Do you repair steam boilers and steam heat?
Yes. Many older San Francisco buildings heat with steam, and Lutz services steam boilers and the radiators they feed. Common steam concerns are the water level and low-water cutoff, the pressure control, failed main or radiator vents, banging pipes from trapped condensate, and radiators that never get hot.
How often should a boiler be serviced?
Once a year, before the heating season, is the usual schedule for a gas boiler. An annual service typically checks combustion and venting, the safety controls, system pressure and the expansion tank, the pumps and zone valves, and on steam boilers the water level and vents. Lutz services boilers in San Francisco on that yearly schedule.
Why does my boiler keep losing pressure?
A hot-water boiler that keeps losing pressure usually has a leak somewhere in the system, a relief valve that is discharging, or an expansion tank that has lost its air charge. Topping it up repeatedly hides the cause. Lutz finds where the water is going before recommending a repair.
Do you repair traditional boilers in San Francisco?
Yes. Lutz diagnoses and repairs conventional boiler concerns involving pressure, burners, controls, pumps, valves, connections, and related hydronic heating components. We inspect the system before recommending whether a repair is appropriate.
Do you service radiators, baseboards, and hydronic heating with the boiler?
Yes. The boiler and the heat-distribution system work together. When the symptom involves uneven heat, a leak, a pump, a valve, a radiator, baseboard, or radiant heating, we evaluate the related system components rather than treating the boiler as an isolated appliance.
How do I know whether to repair or replace my boiler?
The decision depends on the condition of the boiler and the rest of the system. A repairable control, pump, valve, burner-related concern, connection, or localized leak may support repair. A leaking boiler vessel, repeat failures, unavailable parts, poor performance, or a system that no longer fits the home can support replacement. We explain the evidence before recommending a path.
What affects the cost of boiler service?
Cost depends on the equipment, the diagnosed condition, the affected components, working access, and whether the work is maintenance, a component repair, a system modification, or replacement. Gas, venting, electrical, piping, distribution, permit, and inspection scope can also change the work. We diagnose before presenting the next step.
Do boiler repairs or replacements require a permit?
Permit requirements depend on the scope. When planned work requires a permit or inspection coordination, we explain the requirement as part of the proposed scope instead of treating it as an afterthought.
Do you provide 24-hour boiler service?
Our office answers live Monday through Friday from 8 AM to 4:30 PM. After hours, leave a voicemail on the main line for priority callback on genuine emergencies. If you smell gas or suspect a gas emergency, leave the area and call 911, then PG&E at 1-800-743-5000.
Ready to understand the system?
Request conventional boiler service in San Francisco.
Send the heat concern, any error display, the boiler brand or model if known, visible water, and which radiators, baseboards, or radiant zones are affected. Photos can help us prepare for the visit.
Read the seasonal boiler-maintenance guide