San Francisco and Marin's radiant heating and boiler specialists. Over 20 years tackling the complex jobs others avoid — from Eichler in-slab systems to Victorian flat replumbing.
We specialize in boiler installation, radiant floor heating, and complex system design. Hydronic systems are precision equipment — sized, balanced, and piped correctly, or they underperform for decades. We calculate heat loads, select the right equipment, and commission systems properly.
Hydronic heating is our primary specialty
We have more experience with Eichler homes than almost any contractor in the Bay Area. We know their original in-slab copper systems, how they fail, how to pressure test them, when to abandon a loop vs. repair it, and how to connect modern high-efficiency boilers to 60-year-old radiant infrastructure.
Deep Eichler experience — Marin and Peninsula
Storage tank, tankless, or heat pump — we install all types and help you choose correctly. Water heater selection depends on your household size, fuel type, available space, and budget. We assess first, recommend second, and never push you toward a more expensive option than you need.
All types — free estimate before any work
We don't cut corners. From pressure testing lines before connecting new boilers, to calculating heat loads before sizing equipment, to checking every zone valve before calling a job done — we verify our work. Most callbacks in our industry come from skipping a step. We don't skip steps.
Verified before we leave — every time
We install smart water shutoff devices required by State Farm and other insurers, and we find leaks that other contractors miss. Thermal imaging, acoustic detection, and pressure testing let us isolate failures without tearing up floors unnecessarily.
Find it first — before tearing anything up
Based in Novato, we serve all of San Francisco, Marin County, and surrounding Bay Area communities. We're your neighbors — we see the same homes, deal with the same water, and understand the same permit offices you do. We treat your home the way we'd want our own treated.
Neighbors serving neighbors since 2004
Hydroflow Plumbing Inc. was founded with a single mission: to provide expert, high-quality plumbing and heating solutions to homeowners in San Francisco and Marin County. With over 20 years of experience in the trade, we built our reputation on tackling the complex jobs that others shy away from. While we handle all aspects of residential plumbing, our passion is hydronic heating — boilers, radiant floor systems, and the aging infrastructure underneath Bay Area homes. We understand the unique architecture of this region: the Victorian flats of San Francisco, the mid-century modern Eichler homes of Marin. Each requires a specialized approach — and that's exactly what we deliver.
Every job is backed by proper licensing, liability coverage, and manufacturer authorization.
California State License Board licensed, bonded, and insured. You can verify our license status directly on the CSLB website. We pull permits on every job that requires one — no exceptions.
Full general liability insurance and workers compensation coverage on every job. If something goes wrong on your property, you're protected. We carry certificates and can provide them to property managers, HOAs, or insurers on request.
We are factory-authorized installers for Navien, Lochinvar, and Triangle Tube commercial and residential systems. This ensures manufacturer warranty compliance and means we've been trained directly by the brands on proper installation and commissioning procedures.
Free estimates, straight advice, and no pressure. Whether it's a boiler replacement, a radiant-heated Eichler remodel, or a smart water shutoff for your insurer — we'll come out, look at your situation, and tell you honestly what it needs.
Licensed & Insured • SF & Marin County • CSLB #1004731
