Boiler Service & Repair in Marin County
Conor Crawford • February 23, 2026
Expert Boiler Maintenance, Diagnostics & Emergency Repairs
When your boiler stops working, it’s not just inconvenient — it can shut down your entire home’s comfort system.
At Local Plumbing, we specialize in professional boiler service and repairs throughout Marin County, including San Rafael, Mill Valley, Tiburon, Sausalito, Novato, and surrounding areas. Whether you have a modern high-efficiency condensing boiler or an older cast-iron unit, we diagnose it properly and fix it the right way.
Why Boiler Service Is So Important
Boilers are different from forced-air systems. They’re pressurized, sealed hydronic systems that require trained technicians to maintain safely and efficiently.
- Annual service prevents:
- Loss of efficiency (higher gas bills)
- Circulator pump failures
- Air lock issues in radiant systems
- Ignition and flame sensing problems
- Heat exchanger damage
- Leaks at relief valves or expansion tanks
- Carbon monoxide risks
In Marin County, especially in older homes like Eichlers or custom homes with radiant slab heating, neglected boilers can cause serious repair costs if not maintained.
Signs Your Boiler Needs Repair
Call us if you notice:
- No heat or uneven heat in zones
- Boiler making banging or kettling noises
- Radiant floors not warming properly
- Pressure dropping below 12 PSI
- Relief valve dripping
- Error codes on Navien, NTI, Viessmann, Lochinvar, etc.
- Pilot light or ignition failure
- Sudden spike in gas bills
Many “no heat” calls we respond to are small issues caught too late — failed sensors, dirty flame rods, or clogged condensate traps.
Boilers We Service
We regularly service and repair:
- NTI TRX Series
- Navien NHB & NCB
- Lochinvar Noble & Knight
- Viessmann Vitodens
- Rinnai boilers
- Triangle Tube (legacy systems)
- Munchkin boilers
- Cast iron Weil-McLain & Burnham
If it’s hydronic — we work on it.
What’s Included in Our Boiler Service
Our full boiler maintenance service includes:
✔ Combustion Analysis
We use a combustion analyzer to dial in proper gas-to-air ratio for maximum efficiency and safety.
✔ Heat Exchanger Cleaning
Condensing boilers require proper cleaning to prevent efficiency loss and corrosion.
✔ Condensate System Inspection
We clean traps and neutralizers to prevent blockages.
✔ Expansion Tank Testing
A failed expansion tank can cause pressure spikes and relief valve discharge.
✔ Circulator & Zone Check
We test pumps, zone valves, and controls to ensure even heat distribution.
✔ Safety Component Verification
We test pressure relief valves, flame sensors, ignition systems, and safety shutoffs.
✔ Radiant System Inspection
We check manifolds, air separators, pressure levels, and glycol if present.
Emergency Boiler Repair in Marin
If your boiler fails in the middle of winter, we provide fast response throughout:
- San Rafael
- Mill Valley
- Tiburon
- Corte Madera
- Larkspur
- Sausalito
- Novato
We stock common repair parts for the systems most commonly installed in Marin homes.
When Is It Time to Replace Instead of Repair?
We’ll give you honest advice.
Replacement may make more sense if:
- Boiler is 15–20+ years old
- Heat exchanger is cracked
- Parts are discontinued
- Major control board failure on an aging unit
- Repeated service calls
We specialize in high-efficiency condensing boiler replacements and can evaluate whether repair or replacement makes better financial sense.
Why Marin Homeowners Choose Local Plumbing
- Licensed C-36 Plumbing Contractor
- Hydronic specialists (not just general plumbers)
- Combustion analysis on every service
- Experience with radiant slab systems
- Local warehouse & training facility in San Rafael
- Clean, uniformed, professional technicians
- We don’t “just show up and reset the boiler.” We diagnose root causes.
Boiler Service FAQs
How often should I service my boiler?
Once per year minimum. High-efficiency condensing boilers absolutely require annual cleaning.
How long does boiler service take?
Typically 2-3hrs, depending on system condition.
Does boiler service improve efficiency?
Yes. Dirty heat exchangers and poor combustion tuning can increase gas consumption significantly.
Is boiler maintenance required for warranty?
Most manufacturers require documented annual maintenance.
Schedule Your Boiler Service Today
If your boiler hasn’t been serviced in the past 12 months, now is the time.
Serving Marin County homeowners with expert hydronic knowledge and real diagnostics — not guesswork.
Local Plumbing
Your Local Marin Boiler Experts
Call today to schedule service.
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