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 South El Monte, CA | Walnut Chimney
We provide independent Gelco chimney cleaning and repair across South El Monte’s 91733 zip code, and the thing that sets our work here apart is simple: most Gelco fireplaces in this city sit inside original 1950s masonry chimneys that have been re-roofed, stuccoed, or converted to gas, so a “cleaning” almost always uncovers something structural. We’re Walnut Chimney, and we fix what we find, using the right Gelco-compatible parts for the job. Call (855) 341-3461 for a free estimate.

Why South El Monte Residents Choose Us for Gelco Service
Gelco wood-burning fireplaces and inserts are mostly legacy masonry systems, and that’s the work we do every day in the San Gabriel Valley. We sweep, inspect, repoint, and rebuild original fireboxes and flues, not just swap modern factory-built parts. Russ Dempsey, our owner, grew up off Amar Road in Walnut and has been working flues in this area for going on two decades. He’s the guy neighbors call when a fireplace inspection turns up something the last tech missed.
We carry OEM-compatible refractory panels, dampers, and caps for Gelco systems, and we know which aftermarket parts actually hold up when OEM isn’t made anymore. South El Monte homeowners get a straight answer about whether their chimney can be cleaned and repaired or needs real structural work. We’re an independent Gelco service provider, not manufacturer-affiliated, so the recommendation comes from what’s inside your flue, not a brand script. Gelco sales & service is one part of what we do, but the diagnosis always starts with the chimney itself.
Styles & brands we work with





Common Gelco Chimney Cleaning Problems We Solve in South El Monte
- Spalled refractory firebox panels. South El Monte’s postwar tract homes were built with 1940s-1960s fireboxes, and decades of hardwood and scrap-wood burning crack and spall those Gelco refractory panels. We replace them with exact-fit panels where available, or tell you plainly if the firebox itself has failed.
- Cracked terracotta flue tiles after a re-roof. When a South El Monte homeowner stuccoes and re-roofs the chimney without adding a cap, water gets in, freezes during rare cold snaps, and cracks the terracotta. We find this constantly in 91733.
- Washed-out mortar joints in the firebox and smoke chamber. Water intrusion from the uncapped flue dissolves the old mortar, so the firebox won’t seal and smoke spills into the room. We repoint what’s sound and tell you when it isn’t.
- Dampers rusted open or stuck. The dry San Gabriel Valley summers bake creosote hard, and the mild winters bring just enough moisture to rust the damper hardware. A stuck damper is a draft problem and a safety problem.
- Gas inserts running with the original wood flue still uncapped and full of hardened creosote. This is the most common Gelco-related hazard we see in South El Monte: the homeowner converted to gas, the old wood flue got capped or abandoned wrong, and years of creosote went untouched.
Gelco Service in South El Monte: What Local Conditions Mean for Your Equipment
In South El Monte’s 91733 postwar tract homes, the chimney is often the only original masonry left after a stucco-and-re-roof remodel. So a Gelco wood fireplace frequently turns out to have no cap, cracked terracotta tiles, and water damage rather than just soot, and many have been sealed or converted to gas inserts. That changes what a “cleaning” means here. On a 1950s stucco tract house off Rosemead Boulevard in 91733, our tech opened up a Gelco wood-burning fireplace that had been sealed behind a gas insert and found the original terracotta flue tiles cracked with a bird nest packed in and water staining down the smoke chamber — the kind of Gelco repair in Rosemead we handle regularly. We pulled the nest, swept the hardened creosote, repointed the firebox mortar and installed a proper cap, then ran a Level 2 inspection so the homeowner knew the flue was sound before burning wood again. That’s the reality of Gelco service in South El Monte: you’re not just paying for a sweep, you’re paying for someone who knows what these old chimneys hide.
Gelco Models & Products We Service in South El Monte
We work on Gelco factory-built wood-burning fireplaces with refractory firebox panels, Gelco wood-burning inserts, Gelco gas inserts and gas log sets converted from original wood fireplaces, and Gelco-style heat-circulating metal fireboxes with glass doors. For visible firebox and insert parts, we match OEM or exact-fit refractory panels and dampers where they’re available. When Gelco no longer makes a part, like certain caps and flashing, we use quality aftermarket components that actually fit the chimney. We stock the common Gelco-compatible parts locally so South El Monte turnaround is days, not weeks, and we carry the same inventory for Gelco in North El Monte.
See the difference
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AfterGelco Service Pricing in South El Monte
Gelco chimney cleaning in South El Monte costs more than a basic sweep when the chimney hasn’t been maintained through re-roofs and conversions. A standard Gelco fireplace sweep runs $180 to $340. When we find cracked flue tiles or spalled firebox panels, repairs add $400 to $1,200 depending on what’s actually damaged. A new cap installed on an uncapped Gelco flue typically runs $150 to $350. The free estimate includes a visual inspection of the firebox, damper, and accessible flue so you know what you’re paying for before any work starts. Call (855) 341-3461 for an exact quote on your Gelco system in South El Monte.
Serving South El Monte, CA — Our Local Coverage Area
We’re based in the South El Monte area and know this community well, including nearby Gelco in Temple City. Use the map below to see our service coverage — if you’re nearby, we can almost certainly help.

FAQs – Gelco Chimney Cleaning in South El Monte
Yes. If the chimney was stuccoed and re-roofed without a proper cap, water and birds get into the flue, crack the terracotta tiles, and wash out the firebox mortar. A cap is maybe $150 to $350 installed, and it stops the damage that turns a $250 sweep into a $1,200 flue repair. If you’re not sure whether your South El Monte chimney has a cap, call (855) 341-3461 and we’ll check it during the estimate.
Open the firebox and look at the interior walls. If you see brick, mortared joints, and a clay tile flue, it’s masonry. If you see a metal firebox with refractory panels and a round metal flue pipe, it’s factory-built. South El Monte homes from the 1940s through 1960s are almost always masonry, even when a Gelco insert or gas log set has been added. We’ll confirm which you have during the free estimate.
Yes, and in South El Monte this is one of the most important services we do. When a wood fireplace gets converted to gas, the original flue often stays uncapped and full of hardened creosote. That creosote is still a fire risk, and the gas insert needs proper venting. We sweep the original flue, inspect the smoke chamber, and make sure the gas insert is vented safely. Call (855) 341-3461 to have yours checked.
Usually it’s water. South El Monte’s hot, dry summers bake the old mortar, then winter rain and Santa Ana wind-driven moisture get into an uncapped flue and wash it out. The firebox starts to spall and the mortar crumbles. If it’s caught early, we repoint and seal. If the firebox has failed structurally, we say so plainly instead of repointing over a failing chimney.
Once a year, ideally in late summer or early fall before the first cool nights in South El Monte. The fireplace sits unused from spring through September, and that’s when creosote hardens and settles, making it harder to remove later. Schedule in August or September and you’ll be ready when the Santa Ana nights turn cool. Call (855) 341-3461 to book now, before the fall rush.
Service Areas Near South El Monte
We also provide Gelco chimney cleaning in the nearby cities of South El Monte service area, plus Gelco service in Maywood and Gelco service in West Covina. If you’re just outside 91733, call and we’ll let you know if we cover your street.
Book Your Gelco Service in South El Monte Today
If the flue’s clean and the draft is right, everything else takes care of itself. Russ Dempsey and our team handle the full stack: Level 2 inspections, creosote removal, cap installation, and firebox repairs on Gelco systems across South El Monte and El Monte Gelco service calls. Call (855) 341-3461 for a free estimate and we’ll tell you exactly what your chimney needs, no guesswork.
Written by Russ Dempsey, Owner at Walnut Chimney, serving South El Monte and the San Gabriel Valley since the early 2000s.