Level 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.
Before
After
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AfterGelco Fireplace Services in Cambridge: What to Know First
We provide independent Gelco fireplace services throughout Cambridge, from gas fireplace tune-ups to firebox repairs and insert conversions. Most Gelco jobs are completed in a single visit, and we quote the full price before we start - no surprises on the invoice. If your Gelco unit is burning unevenly, the damper is stuck, or you’re smelling gas near the firebox, we’ll tell you exactly what’s wrong and whether it needs fixing now or can wait until your next scheduled service.
This page is for Cambridge homeowners who own a Gelco fireplace, insert, or gas log set and want a technician who knows the difference between a Series 6000 insert and a Vented Gas Log without reading the manual on your time. We’re not a price-cutting chain, and we’re not a one-truck operator who might answer the phone next month. Call (857) 392-4709 - a live person picks up, 24 hours a day.
What happens when you call
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A real person answersNo phone trees - you reach a local pro.
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You get an upfront price rangeHonest numbers before anyone is dispatched.
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A background-checked tech heads outLicensed & insured, dispatched right away.
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You approve before work beginsNothing starts until you say go.
How Gelco Products Fail - and How We Fix Them
- Series 6000 Fireplace Inserts: Blower motor bearing failure. The OEM blower on early Series 6000 units runs hot and loud before it dies completely. We’ve replaced hundreds in Cambridge homes, especially in North Cambridge and Porter Square where these inserts were popular in the 1990s rebuilds. We match the OEM spec or upgrade to a higher-CFM aftermarket unit that moves more heat into the room without drawing more current than the factory wiring can handle.
- Vented Gas Log Sets: Thermocouple drift and delayed ignition. Gelco’s vented gas logs use a standing pilot system that degrades slowly. The thermocouple generates less millivoltage over time, so the gas valve won’t stay open even though the pilot looks fine. We test with a digital manometer, replace with an OEM-equivalent thermopile or thermocouple, and check the pilot orifice for spider webs - a real problem in Cambridge’s tree-canopied neighborhoods where insects migrate indoors every fall.
- Direct-Vent Fireplaces: Failed gaskets and combustion odor. The glass gasket on Gelco direct-vent units compresses and hardens after 8-12 years of New England thermal cycling. Combustion smell in the room is the tell. We replace with high-temp silicone rope gasket rated to 1000°F, not the hardware-store variety that turns to dust in two seasons. We also inspect the vent termination for wasp nests, common on Cambridge’s flat-roofed triple-deckers where the termination sits close to the roofline.
- Firebox Refractory Panels: Cracking from thermal shock. Gelco’s refractory panels are thicker than some competitors but still crack when a homeowner burns green wood or over-fires the unit. In Cambridge’s older homes, especially the brick stacks along Brattle Street with their deep fireboxes, we see hairline cracks that haven’t failed yet and wide cracks that need immediate panel replacement. We source OEM Gelco panels or fabricate custom refractory when the series is discontinued - we keep templates from past jobs.
- Damper Assemblies: Corrosion and stuck blades. Gelco’s cast-iron throat dampers seize when rust flakes fill the track, common in Cambridge where salt air from the coast meets humid summer basements. We disassemble, clean the track, lubricate with high-temp graphite, and replace the damper plate if it’s warped. For units where the damper frame itself is rotted out, we install a Lock-Top or Lyemance top-sealing damper as a permanent fix that also stops downdrafts.
Our Gelco Fireplace Services Process
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Call and schedule. A live person answers, asks what you’re seeing or smelling, and books a window. We don’t use callback queues or apps.
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Arrival and protection. Our technician arrives in a marked van, wearing a Hearthstone uniform. We lay drop cloths from the door to the hearth. Russell Haines still trains every new tech on this himself - the only way to keep standards consistent is to stay hands-on.
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Level-2 camera inspection and diagnosis. We run a camera up the flue, photograph the firebox from every angle, and test all gas components with calibrated meters. You see the photos. We give you a plain-English verdict: what needs doing now, what can wait, and what is fine as-is.
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Parts decision and upfront quote. If your Gelco needs parts, we explain OEM versus quality aftermarket options. We stock common Gelco thermocouples, blowers, and gaskets on the van. For discontinued series, we source from our network or fabricate. The price we quote is the price on the invoice.
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Repair, test, and documentation. We complete the work, test under operating conditions, and show you the result. You get a written report with photos, the 90-Day Done Right Promise, and a handwritten note on our service log - not because we have to, but because the work should be remembered.
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Cleanup and guarantee. We vacuum, remove drop cloths, and leave the hearth cleaner than we found it. The 90-Day Done Right Promise covers everything in writing. If it’s not right, we make it right. No paperwork, no arguing.
What Gelco Fireplace Services Costs in Cambridge
| Service | Typical Range | What Moves the Price |
|---|---|---|
| Gas fireplace tune-up and safety check | $89-$175 | Accessibility of the unit, whether pilot assembly needs cleaning or replacement |
| Thermocouple / thermopile replacement | $180-$340 | OEM versus aftermarket part, whether gas valve also shows wear |
| Blower motor replacement (Series 6000 and similar) | $320-$580 | Motor spec, whether housing is corroded, wiring condition |
| Refractory panel replacement (per panel) | $240-$450 | Panel size, whether series is discontinued and custom fabrication is needed |
| Damper repair or top-sealing damper install | $280-$620 | Extent of corrosion, roof access difficulty on Cambridge’s steep pitches |
| Fireplace conversion (wood to gas or gas insert) | $2,800-$5,400 | Chimney liner requirements, gas line routing, permit complexity |
These are Cambridge-market ranges based on our last 24 months of Gelco jobs. Your exact quote depends on what we find in inspection. Estimates are free, and we do not recommend work without camera evidence you can see for yourself.
Call (857) 392-4709 for a free estimate - we’ll give you the real number, not a lowball that changes on the invoice.
Why Cambridge Homeowners Call Hearthstone Chimney Co. for Gelco Work
We’ve been sweeping and servicing chimneys in Cambridge for over 42 years. Russell Haines learned this trade at Los Angeles Trade-Technical College and has spent decades on Cambridge roofs, including the older brick-stack homes along Brattle Street that have a way of humbling even an experienced sweep. He knows which Gelco parts fail, which aftermarket alternatives hold up, and when a unit is too far gone to justify repair.
Our 90-Day Done Right Promise is in writing with no arguing. Our technicians are background-checked, uniformed, and carry professional-grade materials from DuraFlex, HeatShield, Gelco, Olympia Chimney, Famco, and Copperfield. When a Gelco part is discontinued, we have relationships with suppliers and the fabrication experience to solve it without converting you to a different brand you didn’t choose.
If it needs doing, we will tell you. If it does not, we will tell you that too.
FAQs
No. Routine maintenance and repair by a qualified independent technician does not void your Gelco warranty, provided the work is done to manufacturer specifications and OEM or equivalent parts are used. We document every part number and procedure so your warranty record is clean. If your unit is still under warranty, we flag this before ordering parts so you can choose dealer service if you prefer. Call (857) 392-4709 and we’ll check your serial number against typical warranty periods.
Some Series 6000 inserts and early vented log sets from the 1990s have discontinued OEM parts, but we source quality aftermarket equivalents or fabricate refractory panels from templates we’ve built over decades of Cambridge jobs. We do not substitute builder-grade materials. If a part is truly unobtainable, we tell you before we start so you can decide whether to repair, convert, or replace. Call (857) 392-4709 for a free assessment of what’s available for your specific model.
Repair makes sense when the firebox and flue are sound and the repair costs less than half of a comparable new unit. Replace when the firebox is cracked through, the flue is unlined and cannot be relined economically, or repair parts are discontinued and the unit is inefficient by modern standards. We give you the numbers both ways, with photos, so you decide without pressure. Call (857) 392-4709 for an honest repair-versus-replace comparison.
Once a year, before the burning season begins. Even gas units accumulate dust on burners, develop pilot assembly deposits, and experience thermocouple degradation. In Cambridge, where heating systems run hard from November through March, annual service prevents mid-winter failures and keeps your warranty valid. Our $89 Seasonal Tune-Up includes cleaning, testing, and a written condition report. Call (857) 392-4709 to book before the fall rush.
Gas units develop delayed ignition, sooting, and eventually component failure that costs more than annual maintenance would have. Wood-burning Gelco units accumulate creosote, risking chimney fire, and cracked refractory can expose surrounding structure to heat. Carbon monoxide risk increases in any fuel type when combustion is incomplete. We do not manufacture hazards where none exist - we’ve inspected Cambridge chimneys that were fine after ten years and others that were dangerous after two. The only way to know is to look. Call (857) 392-4709 for a free camera inspection and a plain-English verdict.
Written by Russell Haines, Owner, Hearthstone Chimney Co. at Hearthstone Chimney Co., serving Cambridge and nearby areas.