On-demand warmth for St. Marys' long Ontario winters.
St. Marys sits at 325 metres with winter lows averaging -9.4°C and stretches of genuinely cold weather from November through March. I'll match you with a trusted local dealer who knows Enbridge Gas service, the permit process through the municipal building department, and what actually vents cleanly in a Stonetown-era home.
Every Project Starts From One of These Five Situations
Heat that starts the moment you need it, no woodpile required.
St. Marys doesn't get the brutal, prolonged deep freeze of somewhere like Thunder Bay or Sudbury, but climate zone 6A still means five-plus months where overnight lows sit below freezing, with real cold snaps that push well past -20°C in a hard winter. Sugar maple, red oak, white ash, and yellow birch are the wood species that have heated homes here for generations, and plenty of St. Marys households still burn one of them in a stove or insert. But a lot of homeowners, especially in the limestone-built houses downtown that gave the town its Stonetown nickname, are choosing gas for the main living space instead: no splitting, no stacking, and no worrying about a chimney that was built for a fireplace a century before CSA venting standards existed.
Enbridge Gas serves St. Marys, so natural gas is a straightforward option for most addresses in town; homes further out in Perth Region, past the distribution lines, typically run on propane instead, and either fuel path works for a direct-vent fireplace or insert. Installations run $6,000 to $15,000 CAD depending on whether you're retrofitting an existing masonry firebox or running new gas line and venting for a built-in unit, and every install needs a permit through the municipal building department along with work from a licensed gas fitter, since CSA B365 governs how these appliances get installed and inspected here.
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Frequently Asked Questions
How much does a gas fireplace installation cost in St. Marys?
Most installs in St. Marys land between $6,000 and $15,000 CAD. A direct-vent insert going into an existing masonry firebox in one of the older limestone homes downtown, where the gas line is already nearby, tends to sit toward the lower end. A new built-in unit for an addition or renovation, needing a fresh gas line run and venting through an exterior wall or roof, pushes toward the top of that range. If your property is outside Enbridge Gas's service area and needs a propane tank set, budget extra on top of the fireplace install itself.
Can I convert an existing wood fireplace to gas?
Yes, and it's a common request in St. Marys, particularly from owners of older stone and brick homes with a masonry fireplace originally built to burn sugar maple or red oak. A gas insert typically slides into that existing firebox with a liner run up the current chimney, and most conversions here run $6,000 to $10,000 depending on whether you're tying into Enbridge Gas or setting up propane. It also sidesteps the WETT inspection that insurers commonly require for wood-burning appliances, since gas inserts fall under a different set of rules.
Is natural gas available everywhere in St. Marys, or will I need propane?
Enbridge Gas covers most of the town itself, so if you're on municipal water and sewer in St. Marys, you're very likely within reach of a gas line. Once you're out past town limits into the surrounding parts of Perth Region, coverage thins out and propane becomes the standard fallback, usually with a small tank set on the property. Either fuel works fine in the same fireplace models a local dealer carries; it's mainly a matter of which supply line reaches your address.
Will a gas fireplace keep working if the power goes out?
Most will, and it's a fair question given how a January ice storm or high-wind event can knock out power across Perth Region for hours at a stretch. Units with intermittent pilot ignition run on a small battery backup that kicks in automatically when the power drops. Some manufacturers, including Valor, use a millivolt pilot system that generates its own current and needs no battery at all. Ask your dealer which ignition system is on any model you're considering if outage backup matters to you.
What's the difference between a gas fireplace, insert, and stove?
A gas fireplace is a built-in unit framed into a wall, which is the typical choice for new construction or a full renovation. A gas insert fits inside an existing masonry firebox, which is the more common upgrade in St. Marys' older stone and brick homes that already have a working chimney chase. A gas stove is freestanding on a hearth pad, similar in footprint to a wood stove but running off a gas line or propane tank instead of split maple or ash. For most existing homes in town, an insert is the least disruptive route.
Do I need a permit to install a gas fireplace in St. Marys?
Yes. You'll need a building permit through the municipal building department, and the gas connection itself has to be done by a licensed gas fitter as a separate step, since CSA B365 governs how these systems get installed and inspected in Ontario. Most hearth dealers who work in St. Marys coordinate both the building permit and the gas fitting as part of the job, which saves you from managing two separate trades and inspections yourself.
Vented vs. vent-free gas fireplaces—what should I know for a St. Marys home?
Direct-vent units draw combustion air from outside and exhaust it back outside through sealed venting, which makes them the safer choice for daily use and the standard most local dealers recommend, especially in the tighter, well-insulated homes common through St. Marys' newer subdivisions. Vent-free units burn into the room and are permitted in Ontario under specific room-sizing rules, but they add moisture and combustion byproducts indoors, which matters more in a smaller or older stone home with less natural air exchange. Most installers here default to direct-vent for that reason.
How often does a gas fireplace need servicing?
Plan on an annual check, ideally in September or early October before the first cold snap rather than mid-winter when technicians are booked solid. A service visit covers the burner, pilot assembly, gas connections, and venting, and includes cleaning the glass—a much lighter lift than a wood chimney sweep, but skipping it on a unit that runs daily through a St. Marys winter is how a pilot or ignition failure shows up on the coldest night of the year. A standard visit typically runs $150 to $250.
Gas vs. wood—which makes more sense for a St. Marys home?
Wood, especially sugar maple or red oak seasoned a year or two, still wins on ongoing fuel cost and keeps working without electricity during an outage, but it comes with the WETT inspection insurers commonly require and the ongoing work of sourcing, splitting, and stacking cordwood. Gas wins on convenience: it starts instantly, needs no chimney sweep, and with Enbridge Gas serving most of town, the fuel supply is essentially guaranteed. A number of St. Marys households run gas in the main living space for daily use and keep a wood stove or insert elsewhere in the house as a backup heat source.
Can a gas fireplace run on a thermostat?
Most modern gas fireplaces can—turn it on and off from the couch with a remote, or set a room temperature and let the fireplace hold the comfort zone for you. If low maintenance matters to your family, this is the feature set that makes gas the convenience pick over wood and pellet.
Why do fireplace quotes vary so much?
Because a fireplace is an iceberg—there's more behind the wall than in front of it. A low quote often covers only the unit; the full scope includes vent pipe, gas line or electrical, framing, and the tile or stone that has to come off and go back on. Make every bidder price the whole job. If a dealer can't speak to the full scope with confidence, that's your signal to keep looking.
Does a gas fireplace work when the power is out?
Yes—modern gas fireplaces have a battery backup for the ignition system that lasts for weeks, so no power equals no problem. Your furnace can't say that: no electricity, no blower, no heat. It's one of the most common reasons families add a fireplace, and worth confirming on any model you're considering.
What do I measure to size a fireplace insert?
Four numbers tell you what fits: the front width, the front height, the back width, and the overall depth of your existing fireplace opening. Grab a tape measure, jot those down, and snap a photo of the wall—those two things do more to move your project forward than anything else you can do today.
Nearby Dealers
Hearth shops serving St. Marys and the surrounding area.
Natural Gas Service in St. Marys
Confirm service at your address before planning a gas fireplace—a quick call settles it.
Enbridge Gas
Get your free Project Guide & Parts List for a St. Marys gas fireplace.
Tell me about your home and whether you're on Enbridge Gas or propane, and I'll match you with a trusted local dealer and send a free Project Guide & Parts List with the exact vent kit and parts your project needs.
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