A wood stove or fireplace insert is a different machine from an open fireplace, and its chimney has to be treated differently. AM Chimney Sweep cleans, inspects and relines chimneys in West Milford, where a good number of households rely on something other than a gas furnace to stay warm.
How West Milford heats
Census Bureau estimates show that only about half of West Milford households heat with utility gas. Roughly a quarter use fuel oil, close to one in twelve uses propane, and between two and three percent report wood as their main heating fuel, a small number that is still many times the share in the suburbs closer to Newark. That figure counts only homes where wood is the primary fuel. Stoves and inserts used alongside another system are not included.
Source: U.S. Census Bureau, American Community Survey 2020–2024 five-year estimates.
Why a stove is harder on a chimney than a fireplace
An open fireplace burns fast with a great deal of air and sends hot smoke up the flue. A stove or insert is built to do the opposite: burn slowly, with the air supply restricted, to extract as much heat as possible. The smoke leaving it is cooler and moves more slowly. Cool, slow smoke is what deposits creosote, and a stove turned down low for the night produces it in quantity.
The most important thing about an insert: the liner
An insert slid into a masonry fireplace needs a stainless steel liner running from its flue outlet all the way to the top of the chimney. Some older installations skipped this and simply let the insert exhaust into the big fireplace flue above it. That arrangement drafts poorly, because the flue is several times too large for the appliance, and it builds heavy creosote in the smoke chamber and the flue, where it cannot be reached without pulling the insert out.
The Chimney Safety Institute of America also notes that liners serving solid-fuel appliances need to be insulated. Insulation keeps the flue gases warm, improves draft and reduces deposits, which matters most in a masonry chimney on an outside wall.
If you bought a house with an insert already in place and do not know how it is connected, that is worth finding out before the next heating season. A chimney inspection will tell you.
Freestanding stoves
- The stovepipe between the stove and the chimney needs cleaning as well as the chimney itself. It is often where the thickest deposits are.
- Pipe sections should be fastened together and show no rust-through or white, flaky corrosion.
- Clearances from the stove and pipe to walls, furniture and stored wood are set by the manufacturer. Keep to them.
- Where the pipe enters a masonry chimney, the connection should be tight and the flue beyond it lined.
How often to clean
For a stove or insert used as a regular heat source, plan on a cleaning at least once a year and a check partway through the season. If the glass on the door blackens quickly, the fire is sluggish, or smoke comes out when you open the door to reload, do not wait for the scheduled visit.
Mid-season checks you can do
- Look at the cap from the ground. A mesh screen clogged with black deposits restricts the flue and is an early warning of what is below it.
- Tap the stovepipe. A dull thud instead of a ring suggests buildup inside.
- Watch the smoke outside. After the first few minutes there should be very little. Steady gray smoke means the fire is too cool or the wood too wet.
Burning habits that protect the flue
- Burn wood that has been split and dried for at least six months, to a moisture content under 20 percent
- Run the stove hot for a period each day instead of keeping it at a constant smolder
- Load smaller amounts more often
- Never burn trash, treated wood or glossy paper
Oil and propane flues
With a quarter of local homes on oil, many houses here have an oil flue as well as a stove flue. Oil soot is corrosive when damp, and that flue needs its own yearly attention. If the clay tile in either flue has failed, we install stainless steel liners rated for the fuel in use.
Schedule service in West Milford
Call (862) 225-6529 or request a visit online and tell us what you burn and what it vents into. We also fit caps, repair crowns and carry out flue repairs. Completed projects are in Our Work.