Frequently Asked Questions
Are optional remote controls available for HearthStone gas products?
Remote controls are available for all our current models and most of our older models. Remotes are available that will turn the units on or off, as well as thermostatic remotes that allows you to set a specific temperature. You can maintain that temperature by placing the remote in a specific location anywhere in the room.
In the Euro Collection models, remote controls are included. The ProFlame DX model stoves come with a thermostatic remote included.
Can I burn BioBricks in a Hearthstone wood stove?
No. Our wood stoves are tested and certified with natural cord wood only. Burning properly seasoned cord wood in your HearthStone stove will produce a clean burn that exceeds the EPA efficiency requirements. BioBricks, and similar man made products, can burn too hot and fast to be a good source of fuel, and may cause the stove to overheat. Keep in mind that damage due to over-firing will not be covered by the warranty.
Can I burn coal?
No. Coal burns at extremely high temperatures that can damage your stove. Also, as coal burns it forms "clinkers" which will clog up the ash grate and fill the firebox. Coal emits sulfur compounds, which will permanently etch the ceramic glass.
Can I burn cord wood, corn, or grass pellets in my Hearthstone Pellet stove?
Burning fuels other than wood pellets will void the warranty. No. Hearthstone's pellet stoves are designed to burn only premium grade wood pellets. We specifically designed and tested our pellet stoves to perform well and cleanly burn only pellets made from a variety natural wood products such as softwood and hardwood trees.
Burning cord wood in a pellet stove is dangerous, and will result in an uncontrollable fire, damage to the stove, and potentially a house fire. Corn and grass pellets produce too much ash, or residue, and will result in poor performance, a dirty stove, and could result in a chimney or house fire.
Can I burn driftwood or artificial logs in my HearthStone wood stove?
No. Driftwood is extremely corrosive and should always be avoided. Artificial logs produce extremely high heat for short periods of time and are messy.
Can I burn pellets in my wood stove?
No. Pellet stoves are a forced draft appliance using blowers to inject air into the fire. They have a very unique burn system that is not available in a traditional wood stove.
Pellets will not burn efficiently, or cleanly in a wood stove - at best they will smolder; producing much smoke and creosote.
Can I cook on a Hearthstone wood, or gas stove?
We don’t recommend cooking on your wood or gas stove - but it is possible. If you do decide to, you want to be careful to place the pot on the stone and to lift it off - or use a trivet, or a soapstone tile with small swatches of adhesive backed stove gasket adhered to the feet, or back. Sliding the pot around the top of your HearthStone stove will scratch the stone. Additionally, the stone will be stained by any spilled food, liquid or grease. You will want to monitor your cooking carefully, as boiling could be a problem. The surface temperature of HearthStone stoves usually ranges from 300º-400º, but can get much hotter. This may typically not be hot enough to fry an egg quickly, but is certainly warm enough to cook soups, stews and a nice pot of hot apple cider.
See your Hearthstone dealer for options concerning cooking on your wood or gas stove. We also have an excellent, modern wood fired cook stove, the Deva, that you might want to consider if seriously cooking with wood is something you want to pursue.
Can I get parts and service directly from the factory?No. our network of close to 600 hearth professionals insures that you will get the best possible service on a local level. To locate a dealer near you, please click on the link below. http://www.hearthstonestoves.com/customer-resources/dealer-locator
Can I install a stove in my bedroom?
Most building codes allow wood stoves to be installed in bedrooms. Gas stoves are usually required to be Direct-Vent models. Most codes do not allow Vent-Free stoves over 10,000 BTU's to be installed in bedrooms. Check with your local building inspector for requirements and limitations in your area.
Can I install gas logs in my old wood stove?
No. Gas-fired stoves need much more air to burn properly than wood stoves. A wood stove is tested to burn properly and safely based on its specified purpose. Any modification, such as installing gas-fired logs, not only nullifies that listing, it may result in improper performance and possibly a very dangerous situation. The only time you can modify a stove in any manner is when it is according to the instructions for that particular model.
Can I order parts for an old stove?
Yes, your dealer may be able to help you more conveniently, but if you email us at email@example.com , we will do our best to help you out.
Can I order replacement parts directly from HearthStone?
Generally no, as we are a manufacturer, not a retailer. Whenever possible we want your source for HearthStone parts and accessories to be the Authorized HearthStone Dealer from whom you purchased your stove. An Authorized Dealer is best qualified to determine exactly which part you need. An Authorized HearthStone dealer will use recommended approved replacement parts when repairing, or servicing your stove - this ensures your stove will operate properly, and maintains your warranty. In situations where it is not possible to order from the same authorized dealer where you purchased the stove, you can order parts through any of our more than 600 other Authorized HearthStone dealers.
Can I order stoves directly from HearthStone?
You can order products through this website. In the process of placing that order, you will be paired with an Authorized Servicing Dealer. Wood and gas-fired stoves are not "plug and play" items and therefore it is important to have an Authorized Dealer involved in the selling, servicing, and installing of your HearthStone stove. When installing your HearthStone stove, there are many things you need to consider, such as safety, local building codes, and local environmental considerations. An Authorized HearthStone Dealer, who can help you properly install your stove, is the best place for you to purchase your HearthStone stove.
Click here to find the dealer nearest you.
Can I put different stones in my HearthStone stove, if I choose to do so?
All currently sold Hearthstone cast and stone wood stoves are sold with soapstone as the only option. The stone is an integral component of the stove, and only soapstone can withstand the temperatures achieved, and the thermal stress resulting when burning wood. The only Hearthstone wood stove sold with interchangeable stone was the Starlet (no longer available), which had an internal cast iron firebox. However, all HearthStone cast and stone gas-fired stoves are available in different stone varieties.
Can I visit your manufacturing facility in Vermont?
You are welcome to visit our factory at any time. We are located in Morrisville, Vermont, at 317 Stafford Avenue near the intersection of Routes 100 and 15 just 10 miles past Stowe. We are open Monday — Friday, 8:30 — 5:00 ET. If you would like a tour, please arrive earlier in the day if possible.
Do HearthStone stoves have catalytic combustors? (How does a non-catalytic combustor work? What are the advantages over catalytic?)
Since 1988, all wood stoves are required to pass very strict clean-air standards. In the early years, the only way we knew how to build stoves that would satisfy those standards was to add a catalytic combustor (similar to the catalytic converter in your car). As time went on, non-catalytic technology was developed that not only meets, but also greatly surpasses the federal limits.
Current HearthStone stove models are all non-catalytic; they have a series of secondary air tubes under the baffle in the top of the firebox. These tubes draw a precise amount of heated air, inject it into the fire and actually cause any particles, and gas in the smoke to burn. Consequently, while you enjoy the benefit of more heat out of less wood, your HearthStone stove is helping to keep our environment clean.
There is a lot of debate over the question "Which is better, catalytic or non-catalytic?" Both will produce clean, efficient burns. Our preference is non-catalytic for three main reasons:
A non-catalytic stove burns the same throughout its entire lifetime. Catalytic combustors need constant maintenance and replacement about every 5 years. While their initial emission numbers are a bit better than the non-cats, by the time that combustor wears out those numbers are far below. Non-catalytic stoves produce the same, consistent emission numbers over the lifetime of the stove without the maintenance and expense of replacement combustors. A non-catalytic stove is easier to operate. There is one simple air control. If you want more heat, give it more air, if you want less heat give it less air. Catalytic stoves add a bypass damper that is used whenever the door is opened or new wood has been added to the fire. Flue gas and combustor temperatures must be monitored to know when it is appropriate to close the damper. A non-catalytic stove produces a much prettier fire. Catalytic stoves tend to have a slow lazy burn. Non-cats tend to have a more active fire.
Do your gas stoves require (household) electricity to operate?
No. Some of our gas stoves have a thermopile built into the pilot light system that generates enough electricity (millivolts) to operate the stove's gas valve and the wall thermostat. Our stoves with the ProFlame system utilize standard batteries (AA, or AAA) as a backup power source to run the valve, variable regulator, and burner solenoid if present.
Any convection blower for the gas stove will need 120 volt AC electricity to operate. However, you will find that HearthStone gas stoves heat very well without the blower. Also, there is no fear of damaging the gas stove if the blower is not used.
Do your pellet stoves require (household) electricity to operate?Yes. Our pellet stoves rely on an electronic control system to operate and like all pellet stoves are a forced draft appliance relying on fans to force air into the pellet fuel in the burn pot, and on an auger system to feed the pellets into the pot.
In the event of an outage, the stove will immediately shut down. Any remaining pellets in the burn pot will burn until all are consumed and the fire will go out.
You can operate our pellet stoves on a generator, or other backup power system. Check with your dealer for battery backup systems you can use to operate your pellet stove during a short term power outage.
How can I find a HearthStone dealer near me?
Click here to use our Dealer Search tool.
How do I care for the finish of my stove?
HearthStone stoves typically require very little maintenance. Once the break-in procedures are followed, the only tip is to be careful of scratching or chipping.
If you use a steamer, or cook on the stove's top, be sure to lift the pot off; don’t slide it across the stone - you can also purchase a trivet, or soapstone tile from your local HearthStone dealer to place under the steamer, or pot. Place small swatches of adhesive backed, flat stove gasket material on the trivet's feet, or on the back of the tile.
If something does spill on the stone surface, it will usually "cook" itself out over time as the stove is heated. Do not scrub the polished soapstone with highly abrasive materials - you could scratch the finish. Contact your dealer if you have a tough stain you want removed - they are familiar with proven methods for removing various stains from soapstone.
Cast iron is also extremely low maintenance. Matte black painted stoves may need some touch up paint after a few years; enameled stoves will usually clean up easily with a duster and any regular window cleaner. Please remember that the enamel finish is like glass and can chip if it is struck by a hard object (e.g. fireplace tools). Porcelain touch up kits are available if necessary.
How do I childproof my stove?
Most children will feel the heat as they approach a stove and will stay away from the heat; however accidents can happen.
If you are concerned, contact your HearthStone dealer for screen, or shield options available to protect your children from the hot stove.
How do I clean on top of the baffle in my wood stove?
Get some ½” flexible clear plastic tubing, about 4 to 5’, and duct tape it to the end of your shop vac hose. Place this between the back side of the front and on top of the first secondary air tube. By working the small hose in and out and back and forth, you should be able to get most of the fine residue/fly ash that’s lying on top of the baffle.
How do I prevent smoke from entering the room when I open the door of my wood stove?
Open the the primary air control to its maximum setting, or open the door a crack, count to five, and then open the door slowly. This reduces the possibility of the door drawing the smoke into your room.
How long will a soapstone wood stove last?
With proper care and use, a soapstone stone will last a lifetime. Stone and cast iron are two of the most durable materials on earth. Each stove is designed to withstand the constant heating and cooling cycles associated with burning wood. Soapstone will age with use, including changes in hue that add to the beauty of the stove. Small fractures may appear on a stone's surface, or edges, but they generally do not affect performance or safety. Here are a few suggestions to ensure the life of your stove:
Follow the break-in procedures outlined in your Owner’s Manual very carefully. Do not over-fire your stove. Make sure the ash pan door is closed during operation and the other door gaskets are in good shape. Install a damper if you have a very long flue. Do not burn coal, wood soaked in fuel, driftwood or treated wood. Do not burn liquid fuels, trash, coated paper, or plastic. How much do your stoves weigh? Generally our stoves are heavier than most. For example, our largest soapstone wood stove weighs almost 800 pounds. The additional stone mass improves the heating characteristics of the stoves. Click on the Specs tab below the stove's image when viewing the particular stove's main web page.
Ensure you have sufficient help and the proper equipment present if you need to move the stove.
How would I become an Authorized HearthStone Dealer?
HearthStone is committed to the specialty retail store. Our success relies on dealers who are willing to learn what products are best for their customers, how to install them correctly and how to service them. If you are interested in becoming a HearthStone Dealer, email us at: firstname.lastname@example.org email@example.com
I am having a problem with my HearthStone stove. Can you as the manufacturer help me troubleshoot the problem?
There is a trouble-shooting guide in the back of your Owner’s Manual. If, after checking that guide you still need help, contact an Authorized HearthStone Dealer, preferably the one from whom you purchased your stove. This Authorized Dealership is the best source of information, as they will be most familiar with your installation, and have the expert staff available if service is needed.
I am using LP gas right now. What do I do if natural gas (NG) becomes available in my area?
You need to order an NG conversion kit. There are gas conversion kits available for all HearthStone gas stoves and inserts except the Vent-Free stove models. The procedure is easy, but is best left to a professional. Contact your dealer, a licensed plumber, or a gas fitter.
All current HearthStone gas stoves (except vent-free models) ship from the factory configured to burn natural gas (NG), and some include an LP conversion kit.
Models that use the ProFlame system do not ship with a conversion kit. If you have liquid propane (LP), you must order the optional conversion kit for these models when you purchase the stove.
I heard that catalytic wood stoves are more efficient than non-cats.
The EPA labeled efficiency number was created during the early stages of certification development procedures; it is based on an ‘average’ stove, not your specific stove model. This efficiency number is not a good reference to base your stove purchase upon. We recommend making your decision on your heating needs: Do you want fast ‘on and off heat? (steel) Medium heat? (cast iron) Long, steady heat? (Soapstone).
I need an Owner's Manual for my HearthStone stove. Can I get one from you?
Yes, but check with your local Hearthstone dealer first. Note, manuals are readily available for the most recent model of each stove currently sold. Current product manuals are available for download from this website in PDF format on each stove's own page, or they can be acquired at an Authorized HearthStone Dealer.
To receive an older product's manual, contact your local Hearthstone dealer, or firstname.lastname@example.org send an email containing your mailing address, model, and serial number to: email@example.com
I need an Owner’s Manual for my stove, where can I get one?
First check with your local Hearthstone dealer. Note; manuals are readily available for the most recent model of each stove currently sold. Current product manuals are available for download from this website in PDF format on each stove’s own page, or they can be acquired at an Authorized Hearthstone Dealer.
To receive an older product’s manual, contact your local Hearthstone dealer, or send an email containing your mailing address, model, and serial number to: firstname.lastname@example.org.
Is soapstone durable?
Yes. Wood stoves made with soapstone date back to the early eighteen hundreds. Hearthstone has manufactured soapstone stoves since 1978. We search the world over for sources of soapstone that can be used in our stoves and many sources are rejected. We feel so strongly that our stone will last that we back it with a lifetime warranty. Should we burn hard wood pellets, or softwood pellets? Unlike cord wood, soft wood pellets may actually be preferred as fuel. Talk to you dealer, try a number of different pellet brands to see what works best for you before buying bulk. What are the advantages of a wood stove made of soapstone? Soapstone stores more heat for its weight than any other naturally occurring material. It has twice the heat-storing capacity of iron and superior heat retention qualities not found in cast iron or steel. HearthStone soapstone stoves produce a lasting heat that warms the home steadily and evenly. As the fire burns, the thick soapstone absorbs massive amounts of heat, which continues to radiate for hours, long after the fire cools.
People have used soapstone 'warmers' for centuries, if not millennia. A slab of Hearthstone's soapstone warmed on your stove, and placed in an insulated pouch makes an excellent foot, or bed warmer - try it!
What are the EPA numbers all about?
Wood smoke is often full of unburnt wood particles and other by-products of combustion. Test labs can measure the amount of particulate in the smoke. Prior to 1988 when the government started regulating wood stoves, the best data available shows the average stove produced about 70-80 grams per hour of this particulate. By 1992 the EPA Phase II required all non-catalytic stoves to produce less than 7.4 grams per hour and 4.0 grams per hour if the stove used a catalytic combustor. Catalytic requirements are more stringent because the effectiveness of the catalyst degrades over its life expectancy; non-catalytic stoves have consistent emissions for the life of the stove. Consequently, the two stove types average out to be the same. Currently, all HearthStone stoves are non-catalytic and not only surpass the non-catalytic standards; they also surpass the standard for catalytic stoves. All HearthStone stoves test less than 4 grams particulate emissions per hour. Our Homestead model tested at an amazing 1.9 grams per hour - one of the cleanest burning wood stoves available.
What do I do if I crack a piece of soapstone on my wood stove?
Most cracks that occur in soapstone are merely surface cracks on a natural vein line. The stone is 1.25 inches (3.2 cm) thick, and seldom cracks all the way through. Even if the stone does crack completely, it is rarely anything more than a cosmetic issue. It probably will not affect the use, safety or performance of your stove. Contact your Authorized HearthStone dealer if you need to have a stone replaced.
What does the “R” value mean?
“R” value refers to the heat insulating qualities of a material. When the owner’s manual specifies a hearth pad with a specific “R” value, refer to the chart in the section titled Hearth Requirements & Floor Protection to plan and install your hearth pad.
What is the HearthStone Warranty?
See your Owner's Info packet, or your original Owner's Manual, or contact a HearthStone Dealer for an explanation of HearthStone's Limited Warranty. Warranties can vary based on purchase date, manufacture date, or the collection the stove belongs to, or the type of stove it is.
Note: Different warranties may apply!
Stoves purchased before 9/2001 are covered under different, varying warranty terms - see your original Owner’s Manual. Stoves purchased after 9/2001 and manufactured before 5/31/2011 fall under our 'Limited Lifetime Warranty' - see your original Owner's Manual. The Contemporary Line Stoves (Euro) manufactured before 5/31/2011 have different Limited Warranty terms - see your original Owner's Manual. All Stoves & Inserts manufactured after 5/31/2011 fall under our new Comprehensive Warranty. These stoves ship with a separate warranty document enclosed in the Owner's Info packet.
What type of pellets should I burn in my Hearthstone pellet stove?
We recommend you burn only premium grade pellets. Pellet quality can vary significantly depending mainly on what they are manufactured from, and specifically how they are made.
We have engineered Hearthstone's pellet stoves to burn virtually any quality pellet fuel made from soft, or hard wood. However, low quality pellets will provide lower performance (less heat), and can cause operational problems and more maintenance due to high ash production, too many fines, and high silica content. High quality pellets provide more heat (longer burns per hopper load) , less ash, no burn pot clinkers, cleaner glass and venting - essentially, more reliable operation overall, and the piece of mind that you are maximizing efficiency.
What type of wood should I be burning and how will it affect the performance of my wood stove?
Your HearthStone wood stove will perform best and last longer if you burn cord wood that is cut, split and dried for 1 year before use. Never burn driftwood, painted wood, wood with nails in it or pressed particleboard. These woods contain chemicals that can damage your stove, chimney, as well as harm the environment.
There are several factors that impact your stove’s performance. The most important factors are the type of wood you burn, as well as whether or not the wood is properly dried, or seasoned.
Each species of wood has its own characteristics, yet all wood has roughly the same energy content by weight. The different species vary only in density. Generally, we recommend using hard wood, such as oak or maple, but in many areas, these trees are not plentiful enough to burn. Ultimately, the most important thing is to use wood that is cut and split to the right size, and that the wood is properly dried.
What's the deal with Vent-Free?
The concept of Vent-Free gas stoves has been available in Europe for years. When burned properly, gas stoves exhaust a combination of carbon dioxide and water vapor. Vent-Free stoves are designed to burn very efficiently so any amount of exhaust gases are well below the acceptable limits. There are some things you should consider before installing a Vent-Free stove:
Is there enough fresh air available in the room in which the Vent-Free stove will be installed? New homes are built with more insulation, vapor wraps and tight sealing windows; therefore, there is often no installed source for fresh infiltration air. Vent-Free appliances rely on fresh air being available.
What effect will the water vapor have on your room? A 40,000 BTU Vent-Free stove will produce about 1/2 gallon of water vapor an hour. If your room is damp to begin with, or if the stove is in a tightly sealed room with a lot of glass, that water vapor can become an issue. In severe cases, too much water vapor can cause mold and mildew in the walls. In mild cases, the excess moisture will cause the windows to fog, or frost up in cold weather.
Does anyone in your family suffer from allergies, asthma? Or is anyone sensitive to odors? The emissions from Vent-Free stoves are well below the acceptable amounts of various gases. However, people who are extremely sensitive can still be affected.
Vent-Free stoves are safe and effective when installed and used correctly. Check your local and state building codes, and with your insurance company before you install a vent free appliance. Please talk to your Authorized HearthStone Dealer about your installation before deciding if it is right for you.
Where can I find the Tax Credit Certificate?
Click here to download the Qualifying Units Certificate.
Why do I need a Hearth Pad?
A hearth pad is a safety measure to prevent sparks from igniting any combustible materials around your product. Hearth pads requirements are listed in the owner’s manual for every product under the Hearth Requirements & Floor Protection section. Hearth pads must be made from a non-combustible material, for example bricks, tiles, metal or glass. In some cases an insulated hearth pad may be required. This will be defined by the required “R” value of the pad, and must be followed in order to prevent the floor from becoming dangerously hot. The size of the hearth pad is defined in the same section of the manual. Note that safety codes differ between the US and Canada.
Why doesn’t my new wood stove have a damper?
Since old stoves were not airtight the only way to control the stove was to add a damper in the pipe to restrict draft. New stoves are sealed (air-tight) so the primary air control is all you usually need to regulate the burn rate.
However, very long chimneys can still provide too much draft, and overwhelm the primary and secondary air system. You dealer can help you determine if you have excessive draft. If you have excessive draft, you may need to install a damper.
Why won't my chimney draft properly?
There are many factors that result in a stove not drafting properly. Stoves are normally installed "to code" which may mean they are safe, but the code does not mean it will perform properly.
A properly sized chimney is crucial to a stove’s performance. The old school of thinking said the bigger the chimney the better the draft. As stoves burn more and more efficiently, there is less heat going up the chimney. Consequently there may not be enough heat in an oversized chimney for the stove to burn correctly.
Smoke likes to travel straight up. Every elbow or offset creates a point of resistance that can cause trouble.
Chimneys that run up the outside of a home tend to be very cold. It takes a lot more heat to create draft in an outside chimney than a chimney that is installed on the inside of the home. Metal pre-fabricated chimneys on the outside of the house should be installed in an insulated chase.
Negative pressure in your home can cause a stove to not draft properly. As homes are built tighter in recent years, there is less air to replace air that is used in the combustion process. Basements usually have a lot of negative pressure, as the entire house above it acts as chimney for the warm air inside. Many kitchen exhaust fans now exceed 900 cubic feet per minute. Bathroom fans and clothes dryers also remove air from the home. Your stove can only function properly if there is a sufficient amount of fresh air available for it to burn.
Sometimes a stove that is drafting poorly is the result of a careless installation. The ceramic board on top of the baffle in the stove can be knocked out of place and block the flue. Many times rags are stuffed in the chimney to prevent cold air from entering the home during the installation and someone forgets to remove that rag when the stove in finally installed. If you install a fireplace insert, ensure the flue is tightly connected to a liner that goes all the way to the top of the chimney. The chimney may also need cleaning, or maintenance - over time ceramic liners will crack, and possibly partially block the flue, or allow other air into the chimney. A stove should not share a flue with another appliance, as they will compete for available draft. Check to make sure your clean-out door (if applicable) is closed, and seals tightly.
Finally, external factors such as the design of the roof, nearby trees, wind patterns and the location of the home can have an effect. Your local Authorized HearthStone Dealer is an expert in understanding these factors and their effects on a stove’s performance. Your HearthStone Dealer should be consulted regarding these issues when you purchase your stove.
Will I need to clean the door glass, or does it stay clean by itself? In general, no glass on a heating appliance's firebox will stay perfectly clean.
Gas-fired stove: You should clean the glass on your door at least once a year. The quality of the gas supplied can determine how frequently you may need to clean the glass. All fuel gasses contain some impurities, and also generate byproducts of combustion that will adhere to the glass - usually as a faint white residue.
Always ensure a code compliant sediment trap is installed in the gas line supplying the stove - this will help your stove burn as cleanly as possible, and problem free.
Wood stove: An air-wash system is built into every HearthStone stove. This system uses the draft to cause a curtain of clean, hot air to blow down the inside of the glass. This air, and the fire's radiant heat help minimize door glass fogging or discoloring, making the large windows virtually "self-cleaning" to maximize your view of the gently flickering flames.
However, initial start ups, slow fires, 'green' or very resinous wood, poor draft, and improper fuels can cause some darkening, or sooting of the glass. Ideal conditions produced by a high/hot fire fueled by good seasoned wood at least once a day will help keep the glass free of soot, or creosote.
Over time, a faint white residue will accumulate on the glass. When the stove is cool, and you open the firebox to remove ashes, you can use a non-abrasive glass cleaner, or damp newspaper dipped in white ashes to easily remove this white residue.
Pellet Stove: Your pellet stove has an air wash system very similar to a wood stove. The combustion exhaust blower draws clean air into the stove, heats it and directs it down behind the door glass. This air helps minimize combustion byproduct residue accumulation on the glass.
Over time, a faint white residue will accumulate on the glass. When the stove is cool, and you open the firebox to clean it, you can use a non-abrasive glass cleaner, to easily remove this white residue. Do not use clinker ash to clean the glass - it will scratch it.
Will the glass in my wood stove stay clean?
Yes. The primary air provides a strong air-wash system that will give you a spectacular view of the fire.