Sweep & inspection
Caps & crowns
Flue relining
Masonry repair
Gas fireplace serviceLevel 1 sweep and inspection to the NFPA 211 annual standard - flue, crown, cap, and flashing checked and photographed
Chimney sweep logs do not sweep chimneys. They loosen some creosote - which then falls where a brush and vacuum still have to collect it.
Gelco Chimney Cleaning in Sunnyvale, CA
We provide independent Gelco chimney cleaning, inspection, and repair across Sunnyvale, including the Eichler and ranch tracts where sealed flues hide behind drywall. Our crew has torn down and rebuilt enough Gelco fireboxes, gas log sets, and cap assemblies to know how they wear in Silicon Valley’s mild, dry climate, not just how the factory says they should. If you own a Gelco unit in Sunnyvale, call (844) 980-4364 for a free estimate. We answer 24/7 with fast dispatch from 7am to 7pm, Sunday through Friday.

Why Sunnyvale Residents Choose Us for Gelco Service
Gelco is a niche brand with a specific set of failure patterns, and our experience with its vent-free gas log sets, inserts, and firebox assemblies comes from hands-on teardowns across the South Bay, not from a factory training manual. Raul Escobar, our owner, spent years in the trade before starting this company in 2011, and he treats every Gelco unit as a system rather than a single component. That means we look at the burner, the pilot assembly, the gasket seals, and the flue together, because a dusty log set and a cracked flue tile are usually connected problems.
Sunnyvale homeowners call us because we work exclusively with professional-grade materials like Gelco, DuraFlex, HeatShield, Olympia Chimney, Famco, and Copperfield. Not hardware-store substitutes. We are an independent service company, not authorized or endorsed by Gelco, and that independence matters when we give you a repair-versus-replace assessment on a rusted firebox. Our scheduling is straightforward: you call, we book the job, and the written estimate sets the final price before any work begins.
Styles & brands we work with
- Sweep & inspection
- Caps & crowns
- Flue relining
- Masonry repair
- Gas fireplace service
Common Gelco Chimney Cleaning Problems We Solve in Sunnyvale
- Dust-clogged burners and pilot assemblies on vent-free gas log sets. Sunnyvale’s mild climate means many Gelco vent-free units sit idle from spring through late fall. Burners collect dust and lint, pilot tubes clog, and the first fall startup often brings delayed ignition, sooting, or a flame that lifts and sputters. We clean the log set, test the pilot, and verify the oxygen depletion sensor before we call it done.
- Exhaust staining and dried-out surround gaskets on gas inserts. Gelco inserts installed in 1960s and 70s ranch fireplaces frequently lack a properly sized liner. Exhaust stains the original clay flue, and the surround gaskets dry out and leak over years of sporadic use. We inspect the liner run, replace gaskets where needed, and tell you plainly if the flue needs relining.
- Seized or warped glass door and screen hardware. Older Gelco wood-burning units in Sunnyvale often go years between fires, and the door hinges, screen tracks, and heat-circulating louvers pack with debris or seize from disuse. We free the hardware, clean the louvers, and replace damaged glass assemblies with quality parts that fit the unit.
- Surface rust and failed refractory panels from winter rain. Uncapped flues let winter rain onto steel Gelco fireboxes, especially in 94087 and 94089 homes where remodels sealed off the original chimney. Surface rust spreads, refractory panels crack, and the firebox becomes unsafe. We assess the damage honestly and recommend repair or replacement based on what the steel can actually support.
- Abandoned flues hidden behind drywall or stucco. This is the one most homeowners never see coming. In Eichler and ranch tracts, remodels often sealed the shallow metal firebox behind a wall. We camera-scan before assuming any Sunnyvale house has a working flue, and we find sealed-off Gelco units more often than you’d think.
Gelco Service in Sunnyvale: What Local Conditions Mean for Your Equipment
Sunnyvale’s housing stock shapes how Gelco equipment ages more than almost any other factor. The majority of single-family homes here are 1950s to 1970s California ranches and Eichlers with masonry fireplaces and original clay-tile flues. Many of those flues were never relined, and a lot of the fireboxes were built for ornamental use rather than serious wood burning. In the Eichler and ranch tracts of 94087 and 94089, remodels often sealed the original shallow metal fireboxes behind drywall or stucco entirely. That means a homeowner who buys a mid-century house assuming there’s a working chimney sometimes finds a Gelco unit abandoned mid-wall, disconnected from a flue that was capped years ago. We camera-scan every chimney before we clean or service, because in Sunnyvale the question isn’t just whether the flue is dirty. It’s whether the flue is still connected to anything at all.
Gelco Models & Products We Service in Sunnyvale
We clean, inspect, and repair Gelco vent-free gas log sets, gas fireplace inserts, wood-burning fireplace units with steel fireboxes, and fireplace glass door and screen assemblies across Sunnyvale. For parts, we source OEM Gelco components where they are still available: burners, pilot assemblies, gaskets, and refractory panels. For discontinued items, we use quality aftermarket equivalents and always tell you which one we’re installing and why. We never quietly substitute a generic part, and we never rebuild a firebox that won’t structurally support it.
See the difference
Before
After
Before
After
Before
AfterGelco Service Pricing in Sunnyvale
Gelco chimney cleaning in Sunnyvale is priced per job by the written estimate because the scope depends on what we find: a simple vent-free log set cleaning runs differently from a full Level 2 inspection or a cap installation on a rain-damaged flue. Our estimate is free, and it includes the camera scan, the condition report, and a clear breakdown of what needs work now and what can safely wait. Nothing gets recommended without evidence you can see for yourself. Call (844) 980-4364 for an exact quote on your Gelco unit. We answer 24/7, with fast dispatch from 7am to 7pm, Sunday through Friday.
Serving Sunnyvale, CA – Our Local Coverage Area
We serve Sunnyvale and nearby communities. Use the map below to see the area we cover. If you’re nearby, we can almost certainly help.
FAQs – Gelco Chimney Cleaning in Sunnyvale
We start with a full inspection of the burner, pilot assembly, gas connection, and the flue behind the unit. On a dormant Gelco vent-free set, the usual issues are dust-clogged burner ports, a pilot that won’t hold, and a flue that was sealed during a remodel. We clean the logs and burner, test and replace the pilot if needed, and verify the unit is venting or vent-free as designed. Call (844) 980-4364 and we’ll walk you through what your specific unit needs. Estimates are free.
Yes. We camera-scan before assuming any Sunnyvale house has a working flue, and we regularly find Gelco units abandoned mid-wall in Eichler and ranch tracts where remodels sealed off the original chimney. The scan shows us exactly what’s behind the wall, what’s still connected, and whether the firebox can be restored or should stay sealed. Call (844) 980-4364 to schedule a scan.
Yes. Gelco vent-free gas log sets burn without a flue, so the inspection focuses on burner condition, pilot integrity, oxygen depletion sensor function, and combustion air requirements. A traditional wood-burning sweep checks flue creosote and draft, which is a different job entirely. We inspect both types and never apply a wood-burning checklist to a vent-free unit. Call (844) 980-4364 for details on your unit.
Get a cap installed before the next rain. Water through an uncapped flue rusts steel fireboxes, cracks refractory panels, and soaks the clay tile, and Sunnyvale’s winter storms deliver enough rain to do real damage. We install caps sized to your flue and verify the mortar crown is still shedding water. Call (844) 980-4364 for a free estimate on cap installation.
That depends on the extent of the rust and whether the refractory panels have failed. If the steel is surface-rusted and the panels are intact, repair is usually the right call. If the firebox has rusted through or the refractory is crumbling, replacement is safer and often cheaper in the long run. We give you an honest assessment with photos so you can see the damage yourself. Call (844) 980-4364 and we’ll evaluate yours.
Service Areas Near Sunnyvale
We serve Sunnyvale and the surrounding South Bay communities, including Santa Clara, North San Jose, Milpitas, Fremont, and Hayward. If you’re in one of these areas with a Gelco unit that needs service, call us at (844) 980-4364. We answer 24/7 and dispatch fast from 7am to 7pm.
Book Your Gelco Service in Sunnyvale Today
Call (844) 980-4364 for a free estimate on your Gelco chimney cleaning, inspection, or repair in Sunnyvale. We answer 24/7 with fast dispatch from 7am to 7pm, Sunday through Friday. The estimate is free, the camera scan is included, and the written estimate sets the final price before we start.
Written by Raul Escobar, Owner at Chimney Cleaning Fremont, serving Sunnyvale since 2011.