How Long a Fireplace Insert Lasts, Part by Part

No Honest Number of Years

You will see a figure in years quoted for inserts. None of the maker and agency documents we opened for this page gives one for a whole insert, and how long one lasts depends on how it is burned, what it burns and how it is looked after. So instead of a number, this page sets out what wears, what can be replaced, and the signs that the insert itself is finished.

The Regency i2450-2 manual shows how a modern wood insert is built to be maintained: its parts list includes the door gasket, the glass with its gasket, the baffles, the smoke deflector, the air tubes, the firebrick and the blower, each with its own part number.

Parts Made to Be Replaced

The EPA says plainly that the baffle and some other internal parts of a non-catalytic stove need replacing from time to time, because they deteriorate in the high heat of clean burning. That is normal wear, not a sign the insert is failing.

• Door gasket: a rope seal that compresses and hardens; replaced when the door will not seal even after the latch is adjusted.
• Glass and glass gasket: replaced if cracked; never run an insert with broken glass.
• Baffles and smoke deflector: the plates at the top of the firebox, worn by heat.
• Secondary air tubes: the pipes that feed the flames at the top, replaced when damaged.
• Firebrick: the lining of the firebox, replaced brick by brick when cracked or crumbled.
• Blower and its heat sensor: cleaned yearly, replaced when they fail.

The Yearly Check

The Regency manual's annual maintenance table is a good model for any wood insert. Do the easy parts yourself with the insert cold and the blower unplugged; leave anything that means removing the insert or the liner to a crew.

The paper test in that table is simple: close the door on a paper bill with the insert cold and try to pull it out. If it slides out easily, adjust the latch; if that does not fix it, the gasket needs replacing.

• Clean out the whole firebox.
• Inspect the air tubes and firebrick; replace damaged parts.
• Run the paper test on the door gasket; adjust the latch or replace the gasket.
• Check the glass for cracks.
• Lubricate the hinge and latch with high-temperature anti-seize only.
• Unplug and clean the blower; do not oil it.
• Have the chimney cleaned, with the baffles and air tubes removed for access.

What Shortens an Insert's Life

Overfiring is the big one. The Regency manual says that if the connector, baffle or top glows, the insert is overfiring, and that overfiring can cause warping and premature steel corrosion. It happens with too much air for too long, too much wood, or fuel like scrap lumber and cardboard. Wet wood and slow, smoldering fires do their own damage by coating everything in creosote.

The manual also says to replace failed parts only with its own listed parts. Homemade gaskets, odd firebrick or a baffle from another stove change how the insert burns, and some of those changes shorten its life.

Catalytic Inserts

A catalytic insert has one more wear part, the ceramic catalyst that burns the smoke. The EPA says the catalyst degrades over time and must be replaced, that its life is largely in the user's hands, and that overfiring, the wrong fuel and skipped cleaning shorten it. Opening the bypass every time the door opens is the habit that protects it.

The Liner Is Part of the Life

An insert is only as sound as the liner above it. The DuraLiner instructions ask owners to check the liner for corrosion and say that after a flue fire the chimney must not be used again until it has been inspected. Chemical cleaners, they warn, may be highly corrosive. A liner that has corroded or been through a chimney fire is replaced, and the insert can usually stay.

Signs the Insert Itself Is Finished

Replacement makes sense when the part that cannot be swapped is the part that has failed. Look for these with the insert cold and a flashlight, and have a crew confirm before deciding.

• Steel firebox walls or top that have warped, bulged or cracked.
• Rust that has eaten through the firebox, not just surface rust on the outside.
• A door or frame so bent that no new gasket will seal it.
• Listed replacement parts no longer available for the model.
• Repeated overfiring damage that keeps returning after repairs.

Repair or Replace: Our Visit

An insert with a sound steel body needs parts, not replacing. On a free inspection we check the firebox, door, glass, baffles, blower and liner and give you a written estimate for each, and if the insert is at the end of its life we say so plainly. When a new one is the answer, our fireplace insert installation covers the insert and its liner as one job.

Honest repair-or-replace advice is easier for a local, family-owned shop with an experienced crew and nothing to push, and that is what we are, Proudly American too. A Proudly American family business stands behind the advice it gives Spring Hill homeowners.