BOILER replacement
Boiler Installation & Replacement in Marin & Sonoma
Local Plumbing — High-Efficiency Boiler & Hydronic System Specialists
If your boiler is old, unreliable, or you’re upgrading to high-efficiency heating, Local Plumbing provides professional boiler installation and full hydronic system setup throughout Marin, Sonoma, and Napa counties.
We install all major boiler brands, design hydronic piping systems, and set up radiant heating, indirect water heaters, combi systems, zoning, and domestic hot water loops.
Why Homeowners Choose Local Plumbing for Boiler Installations
A boiler installation isn’t just “swapping a unit.” The entire system must be correctly sized, piped, vented, and commissioned. We provide:
- Full boiler sizing & load calculations
- Primary/secondary piping design
- Low-loss headers, mixing valves, and manifold design
- Radiant floor system integration
- Domestic hot water connections
- Outdoor reset setup & control programming
- Gas sizing verification
- Venting & combustion air upgrades
We install more boilers annually than most North Bay plumbing companies — and we install them the right way, per manufacturer specs and California code.
When It’s Time to Replace Your Boiler
Homeowners typically replace their boiler when:
- The system is 15–25 years old
- It’s taking too long to heat the home
- The boiler cycles on/off frequently
- Hot water is inconsistent
- Repair costs are adding up
- The radiant floors never fully warm
- The system makes banging or whistling noises
- The heat exchanger is failing
- Parts are becoming unavailable
Modern high-efficiency boilers solve nearly all of these issues while reducing gas usage.
Boiler Types We Install
High-Efficiency Condensing Boilers
Wall-hung or floor-standing units with AFUE ratings up to 96%.
Combi Boilers (Heat + Hot Water in One Unit)
Ideal for smaller homes, ADUs, remodels, and radiant systems.
Boiler + Indirect Water Heater Systems
The highest performance option for large families or multi-bathroom homes.
Radiant Heating Boiler Systems
Designed for in-slab radiant loops, low-temp systems, manifolds, actuators.

Boiler Brands We Install
We are officially trained or highly experienced in installing the following North Bay boiler brands:
Navien
NFC • NCB-E • NFB series
Ideal for combi systems, radiant heat, and small mechanical rooms.
NTI
TRX • TFT series
Excellent modulation, quiet operation, strong for multi-zone setups.
Lochinvar
Knight KHN/WHN series
Top-tier boilers for larger hydronic systems and radiant homes.
HTP
UFT • Elite • Versa
Reliable, efficient, and common in Marin radiant homes.
Laars
Mascot & Neotherm
Compact units perfect for mechanical closet installations.
Triangle Tube
Prestige & Instinct
Fire-tube heat exchangers, great longevity, common in older radiant homes.
IBC
S, SL & VX Series
Canadian-made, excellent efficiency, superb for radiant and multi-zone.
Noritz
NRCB Combi
Great for smaller homes, remodels, and DHW-dominant applications.
Rinnai
E-Series, Q-Series, i120/i150
A very common replacement option in Petaluma, Novato, and Santa Rosa.
What’s Included in a Local Plumbing Boiler Installation
✔ Complete removal of old boiler
Including disposal of old tank-style, wall-hung, or floor-standing boilers.
✔ New high-efficiency boiler installation
Sized correctly for your home’s BTU and flow requirements.
✔ Proper hydronic piping
Primary/secondary piping, closely spaced tees, or low-loss headers.
✔ New circulator pumps or ECM upgrades
We often replace old, inefficient pumps with modern ECM stainless pumps.
✔ Radiant heating integration
Manifolds, actuators, mixing valves, purge stations.
✔ Gas line sizing & pressure testing
Ensuring proper delivery for high-efficiency condensing boilers.
✔ Venting system upgrades
New PVC, CPVC, polypropylene, or stainless venting per manufacturer requirements.
✔ Startup, commissioning & control programming
We dial the system in for efficiency and comfort.
✔ Full system walkthrough
We show you how your new system works and how to adjust thermostats and zones.
Boiler Installation Pricing**
Pricing varies based on installation type, access, and piping requirements. Typical ranges:
- High-efficiency boiler replacement: $8,500 – $15,000
- Combi boiler installation: $11,000 – $16,500
- Boiler + indirect water heater: $19,000 – $29,000
- Radiant heating boiler system: $12,000 – $18,000
- Pump, manifold, and valve upgrades: $1,200 – $4,500 added
We provide clear, written estimates before any work begins. Pricing varies from job to job**
Real Installation Examples
Mill Valley — Navien NFC Combi Boiler
Project: Replace aging tank-style boiler + water heater
Upgrades: New combi unit, ECM pump, zone controls
Result: Faster hot water + much quieter system
Total: $15,400
San Rafael — Lochinvar Knight + Radiant System
Project: New hydronic boiler for 5-zone radiant
Upgrades: New low-loss header, 3 ECM pumps, purge station
Total: $17,200
Petaluma — IBC SL Series Retrofit
Project: Replace 20-year-old cast-iron boiler
Upgrades: Modern condensing unit + new venting
Total: $16,900
Tiburon — Triangle Tube Prestige
Project: Boiler serving radiant floors + domestic hot water
Upgrades: Manifold rebuild + mixing valve
Total: $16,800
Service Areas
Marin County: San Rafael, Mill Valley, Tiburon, Larkspur, Sausalito, Fairfax, San Anselmo, Corte Madera, Novato
Sonoma County: Petaluma, Cotati, Rohnert Park, Sonoma, Glen Ellen, Penngrove
Napa County: Napa, American Canyon
Boiler Installation FAQ
How long does a boiler installation take?
Most installs take 1–2 days, depending on piping and system complexity.
Do high-efficiency boilers save money?
Yes — homeowners often see 15–30% reduction in gas usage.
Do I need a combi boiler or a boiler + indirect tank?
We’ll recommend the right setup based on home size, bathrooms, and hot water demand.
Can you install a boiler for radiant floor heating?
Yes — we specialize in radiant heat systems, manifolds, and low-temperature boiler setups.
How long does a boiler last?
Most high-efficiency boilers last 12–20 years with proper maintenance.
Book a Boiler Installation Estimate
Local Plumbing provides professional boiler installations across Marin, Sonoma, and Napa.
- High-efficiency experts
- Radiant heating specialists
- Clean, code-compliant installations
- Local team based in San Rafael, Sausalito & Petaluma
