Fireplace and Furnace Chimney Liners
Various names: fireplace liner, furnace liner, boiler liner, water heater liner, stainless steel liner, chimney liner, aluminum liner, flue liner, chimney relining.
Uses: Stops heat from transferring outside designated area. Stops erosion. Prevents carbon monoxide risks. Stops fire hazards within length of chimney. Stop smoke/gas transfer between multi-flue chimneys.
Material used: In most cases a stainless steel liner (304 or 316). Furnace/boiler liners come with a stainless steel top plate and rain cap and all connectors from appliances to liner. Other liners may be used dependent on your current appliances. TherMix is used on all fireplace chimney liners. (TherMix effectively insulates the liner, maintaining consistent liner temperatures. As a result, it reduces condensation, increases drafting efficiency, and aids in a quick ignition – helping establish draft and greatly reducing spillage.)
Warranty: Lifetime on all stainless steel liners. Aluminum can be used in some cases (not recommended) and only come with a 10 year warranty. Aluminum cannot be used in fireplaces.
Masonry fireplace chimneys: Most masonry fireplaces these days come with a clay tile liner, that can vary greatly in size from chimney to chimney. These clay tile liners go bad after time, due to: an open flue (rain and snow pouring down it), poor construction and wear and tear from heat. Those are the main causes, though not being limited to them. If any of the aforementioned cases happen – then you must get a new liner. The most common way to do this is not by replacing the clay tiles because this is near impossible, since the chimney is now built around it; but to reline the fireplace with a stainless steel liner. The stainless steel fireplace liner will fit between your old liner (if possible, sometimes breaking out all the clay tiles is needed) and go from the top of your fireplace chimney, down to the bottom of your smoke chamber. After that task is completed, TherMix will be poured between the new stainless steel fireplace liner and existing clay tile liner. Both the new liner and the TherMix will create a safe fireplace for you to burn in many, many years to come.
Furnace chimney liners: Furnace liners are impacted and damaged much in the same way that a fireplace clay tile liner is. There is, however, one huge factor that tends to cause more damage – and that is there is constantly corrosive gases from either a furnace, boiler or water heater being vented through it. We’re seeing more and more in modern times highly efficient appliances, which is both great for your bills and for the economy. There is an awful side effect to this though and I will explain. Liners are sized according to the appliances that are first put in the homes, this sizing is according to the height of the chimney and the amount of BTUs (British Thermal Units) all the appliances venting from the home output. So now that we know the basics of how a liner size is gauged, we get to the problem – and that is, as furnaces, boilers and water heaters become more efficient, they put out less BTUs. The adverse affect of this is, gases will now start cooling at a quicker rate than previously. So now you have corrosive gases cooling and condensation inside your clay tile liner. This will literally start eating the chimney from the inside out and is becoming the number one cause (if not already it) of chimney rebuilds.
Our Windy Chimney technicians are exceptionally good at finding the tell-tale signs that you may be in need of a new furnace, boiler or water heater liner. Have us out for an inspection if you have had any of the units changed out or removed in recent years and we can let you know if your current liner is the proper size, if there is any damage to the interior of the liner or if you need a new liner.
*Due to dimension changes, fireplace liners may require an exhausto fan.