Stainless steel is suitable for wood burning, gas, or oil applications. CLICK THIS IMAGE NOW TO BUY THIS KIT. The flue piping of the system, whether for single or multiple appliances, should be as short a run as possible, and rise 1/4″ per running foot up and toward the chimney. NFPA 54 and 211 deal with chimney standards and sizing for the flue. Chimney Liner for Water Heater. Maintenance Tip #1 Preparing the water heater Turn off the power if its an electric water heater. Tell the homeowner, “Sir, you need a chimney liner because your chimney is unlined brick; its flue is too large to support proper drafting of combustion products, which include carbon monoxide. Installing new water heater .62 natural gas 40,000 btu 50 gallon in masonry chimney that is 30 feet high, only water heater now. Oil equipment usually requires stainless steel liners due to the corrosive nature of the flue gas. diameter flue is 12.588-sq.in. The rules also state that orphaned water heaters vented into an unlined masonry chimney require the installation of a properly sized liner. If the exhaust pipe is 4 inches in diameter, the flue liner cross sectional area should not … Before you installed your new furnace, your old low efficiency furnace cycled on and off frequently. As tricky as venting has become with today’s high-efficiency appliances, there’s one thing too many of us are ignoring — orphaned category I appliances and how they relate to these older chimneys. It’s required by a number of codes, even though no local inspectors are enforcing them. It was a classic case of sustained flue gas condensation, which contains both nitric and sulfuric acids. If it is a 3-inch-diameter pipe, the inside cross sectional area of the chimney flue liner should not exceed 49 square inches. Gas Water Heater and Furnace Chimney Flue Size Calculations The basic method for the chimney flue size calculations is "The Seven Times Rule" (applies to natural draft and / or fan assisted type appliances vented into the same chimney). Our stainless chimney liners are primarily used to upgrade and repair existing chimneys. Appliances that burn wood typically use stainless steel but with the addition of a fire proof insulating sock to make sure the flue gas does not cool down when rising in the chimney. We learned that a chimney liner can be installed for as low as $2.95 per month in Toronto and GTA if he was to replace his existing old rental hot water heater to an energy efficient rental unit. Can you see the mistake in this photo? 741. Install an increaser in the largest hole in the chimney. Each event will offer insight on the newest products from Navien and allow attendees to interact and ask questions live with the Navien team. This code, as well as other uniform building codes, contain tables and charts that people use to properly size and install chimneys for fuel burning appliances. Its located on top of the water heater. View All. Aluminum chimney liners typically are used on gas appliances like gas water heaters. The result of those calculation using a 38,000 BTU water heater with a 3" draft hood and a 37,500 BTU boiler with a 4" draft hood connected to a 20' high chimney is to use a common flue with an area of 28 square inches or a 6" flue vs a 5" flue in the previous examples. Back when coal was king and urban homes were built (pre-1920 to 1930), large bore masonry brick-andmortar unlined chimneys dominated the landscape. Tell the homeowner, “Sir, you need a chimney liner because your chimney is unlined brick; its flue is too large to support proper drafting of combustion products, which include carbon monoxide. A second suggestion that we got is to have a conventional hot water … Clay tiles as well are frequently used (just like fireplaces) because of their inexpensive cost and durability. Washington, D.C. Area. Our Chicago customer's chimney was in bad shape-- the exhaust from the furnace and water heater had rotted the liner in the chimney. CLICK HERE to get FREE & FAST BIDS from local chimney sweeps who can inspect your chimney for defects. The exhaust gas temperature of modern gas furnaces and water heaters is much lower than past appliances because much more heat is harvested so you waste less money up your chimney. Can you see the mistake in this photo? After this discovery, the homeowner immediately installed four-inch pipe from the heater to the chimney. For every 100,000 Btu of combustion, a gallon of condensate can be generated! Proper furnace / water heater venting is an extremely important issue, which depends on the performance of the house chimney / chimney flue or other exhaust assemblies. What portion of your quote for my new high-efficiency furnace was for the chimney- liner? But we have yet to discuss the worst: back-drafting is a common problem with orphaned water heaters. Those old 8 x 12 or 10 x 10 chimneys will lead to sustained flue gas condensation, damage the chimney and— eventually — result in property damage. Do you think it's necessary to have a chimney liner installed? All rights reserved. There is, however, a somewhat reliable rule of thumb to give us a line that we should not cross where safety is paramount: the chimney’s dimension should not exceed the connecting flue’s dimension by more that sevento- one. Air … The ice-sheen that had caught my attention led to the chimney’s protrusion at the roofline and it was obvious its shape outlined the chimney’s exact route and dimensions from basementto- roof. Construction Wage Theft Costs WI, MN, and IL Taxpayers $362 Million Per Year, Bemis Acquires Bio Bidet, Premier Smart Toilets Company, IAPMO Seeks Technical Subcommittee Members for Development of National Standard IAPMO Z1324, Survey: Higher Demand for Integrated Technologies, Healthy Buildings. I’d never seen sustained flue gas condensation previously, but the basement floor markings revealed the old coal furnace had been replaced or converted and recently replaced with three new “high-efficiency” boilers. The U.S. Department of Energy allows for one-minute of back-drafting for orphaned water heaters — maximum. Lined chimneys vs. unlined chimneys, and so on. This is a kit that allows you to install a stainless-steel liner inside a larger masonry chimney clay flue. Sometimes the condensed water contains acids that can chemically attack poor quality mortars. In other words, the square inch area of the chimney must not be more than seven times greater than the flue piping. Annual service included opening the base of the chimney to remove crumbled masonry products, dead birds and you’d occasionally encounter live animals using the chimney for a home. New Jersey Uniform Construction Code requires a chimney certification for replacement of a hot water heater, furnace or boiler. Lawyers don’t ignore this If you’re ignoring orphaned water heaters, lawyers and liability experts are not and you’d be wise to broaden the scope of your work to include chimney liners. FIREPLACES: FIREPLACE INSERTS: FURNACE & WATER HEATERS: WOOD, CORN & WOOD PELLETS: … Use a flashlight and safety glasses to see as far up the flue as possible. Imagine if the huge boilers of your local power plant tried to exhaust up your house chimney. Chimneys are like water pipes, they can only handle so much exhaust at a given pressure. The oddities we’ve seen where venting is concerned give rise to grave concerns: standard water heaters replacing direct-vent water heaters to shave costs while using the PVC vent line; high-efficiency furnaces or boilers vented into those old unlined masonry chimneys, which by itself is bad enough, yet the older atmospherically vented water heater continues to exhaust into the same chimney! Install the chimney cap to ensure a good fit then remove and apply silicone on the top edge of the chimney (as shown) and reinstall cap. For many years, the American Gas Association (www.aga.org) and the National Fire Protection Association, Inc. (www.nfpa.org) have authored the National Fuel Gas Code. I've got a 40 gallon atmospheric-vented water heater that is not venting correctly. My understanding of chimney liners is that as furnaces became more efficient over the years, there's less heat going through the chimney and it has an effect on condensation which will ruin the chimney from the inside out. Measure the diameter of the exhaust pipe leaving your hot water heater. There are approved corrugated metal pipes that you can snake down the chimney and connect to the exhaust pipe of your heater. If the inside of the chimney cools down too much or there is too much cold air inside the chimney, the water vapor can condense and saturate the masonry inside the chimney before it can escape into the atmosphere. The clay tile chimney liner is damaged due to shifting, fire damage, or age- or use-related damage; A new appliance (furnace, stove, or water heater) is being installed and vented via a masonry chimney. This unique alloy is designed specifically to resist acids coming from gas appliances in the flue and extreme stresses of hot and cold cycles. Secure with Zip Screws. Chimney Problems Gas Water Heater Heating System. I suggest that you contact your local building or fire department inspector. Some chimney companies can reduce the size of the chimney by pumping a cement slurry around a giant inflatable bladder. Water vapor is a byproduct of the combustion of natural gas. Chimneys you cant live with them and you cant live without them or at least you couldnt until a few years ago. Before doing plumbing work you must perform these safety steps: Turn the electricity off if you have an electric water heater or turn the gas control knob to PILOT if you have a gas water heater. It locks in moisture and flue gases in your chimney and keeps them out of your home. You’ve seen similar applications, too. For optimal use and safety, a liner is needed when installing a new heating system, furnace, boiler, or water heater. If you decide to reline your chimney, by all means make sure you do it under the guidance of your local building department officials. Currently, there are many organizations that produce building codes. The conditions explained in this post also apply to the wood burning appliances. We respect your email privacy. Research is currently being conducted by the Gas Research Institute that may create changes used in sizing masonry chimneys. If that were to happen, it could drag some of the exhaust gas back into your basement. Metal Chimney Liners. Robert K., Norwich, CT. DEAR ROBERT: Venting of any fuel burning appliance is serious business. This can, in some instances, create condensation problems inside of masonry chimneys. Multiplied times 7 in the code, you're chimney cannot be more than 49 sq inches of interior area. Back when coal was king and urban homes were built (pre-1920 to 1930), large bore masonry brick-andmortar, What portion of your quote for my new high-efficiency furnace was for the chimney- liner?”, “That’s too much — no one else even mentioned we’d need an expensive liner — you trying to rip us off here?”. Chimneys — you can’t live with them and you can’t live without them — or at least you couldn’t until a few years ago. That's about 7 sq inches. Flexible chimney liners are only to be installed inside a masonry chimney. IRVINE, CA – Navien, Inc., the number one brand in high efficiency condensing tankless water heaters, combi-boilers and wall-hung boilers in North America, has announced two virtual launch events for the beginning of 2021. With efficiencies ranging from 30% to 50%, lots of combustion byproducts needed to be safely vented from homes. White effervescent trails ran from the chimney’s base down the wall and the same white powdery substance was evident at each joint in the combined flue piping. In 1978, that meant anything above 80%! I'm concerned about exhaust gas damage that might be occurring inside my chimney. These liner systems are U.L. In the new house I am buying, the furnace and hot water heater have were both replaced by the current owners. Flue gas produced by your furnace and water heater contains acids . A 3-in. This process kept the inside of the chimney warm. Share. The liner protects the house from heat transfer to combustibles while being installed in a masonry chimney. Install smoke caps in the smaller holes and seal them with furnace cement. The inspection shall include verification that the flue or flues being inspected are free of combustible deposits and blockage or obstruction. 316Ti Flexible Chimney Liner Only. The flue piping looked like Swiss cheese! No longer a blastfurnace- like exhaust to build and maintain buoyant hot exhaust fumes, this was more like a pipe-organ-exhaust with each tenant possessing one of the keys to strike up an exhaust tune. During one winter’s service call for a heating problem, I noticed the exterior north wall of the home had a shiny appearance. Today, we’d be either installing a chimney liner or direct-vented high-efficiency appliances. Favret will typically install the liner, Frary said, unless the water heater and furnace are on separate chimney chases. The other alternative would be to include the cost for a new direct-vent water heater and abandon the chimney completely.”, “Forget it; I’m going with the other guy.”. Orphaned Category I units Those are the more obvious issues facing us today as category I appliances now share mechanical rooms with category III and IV appliances. After this discovery, the homeowner immediately installed four-inch pipe from the heater to the chimney. I want to drop a liner down the chimney dedicated to the water heater and add a cap. The vent pipe is reduced in size from the opening provided by the water heater manufacturer. Subscribe to the FREE Ask the Builder newsletter to receive professional advice for your home. There simply wouldn't be enough room to handle all the smoke and ash. Turn off the water to the water heater by closing the valve on the cold water line. Registration for both events is up now at navieninc.com/live. A Stainless Steel chimney liner is air and water tight. It's vented into an unlined chimney and the back draft is too much for the water heater to create the correct draft. The vent for your recently orphaned water heater may not have been checked by the furnace installer. Chimney liners are a protective barrier usually made of metal or ceramic. Contractor of the Year: John W. Danforth Co. Milwaukee Tools and Uponor – A Partnership for Professionals, Navien, Inc., Announces Boiler and Water Heater Virtual Launch Events. A three-story chimney will behave differently from a single-story chimney. Low moisture content cement and vermiculite mortars can also be used to create a new inner lining. Measure the diameter of the exhaust pipe leaving your hot water heater. Three water heaters had been installed, too, and each apartment had its own gas meter. and its corresponding chimney flue limit is just over 88-sq.in. That heat source has been removed. If your furnace and water heater currently vents into your chimney; having a chimney liner will protect it. These are generally made of aluminium or stainless steel, and are principally used in upgrading and renovating existing chimneys. Herein lies the problem. Don't use your fireplace with a cracked liner. Clay tile liners can suffer from the excessive condensation found in the exhaust of higher efficiency gas appliances (furnaces, water heaters, and boilers) and, over time, could cause chimney liner … Water vapor is a byproduct of the combustion of natural gas. This is a kit that allows you to install a stainless-steel liner inside a larger masonry chimney clay flue. These systems of chimney liners are listed and tested by the U.L., and are quite harmless and sturdy when correctly mounted and sustained. Fill any voids with pieces of gravel or brick, and then seal the increaser in place with furnace cement. ; a 4-in. Closer inspection revealed it was a combination of frost and ice. Only work on water heaters if you’re handy and comfortable that you know what you’re about to do. Around here, most tile liners are 6.5 x 10" and a smaller liner is needed. The cold line is always to the right. My water heater is now the only thing venting into the masonry chimney. Open a hot water tap inside the house. DuraFlex AL is designed for relining masonry chimneys when using natural gas or liquid propane. It's best to use a stainless steel chimney liner if you're high-efficiency water heater or furnace exhausts into a masonry chimney. © Copyright 2017 Tim Carter eval(ez_write_tag([[468,60],'askthebuilder_com-box-3','ezslot_19',116,'0','0'])); DEAR TIM: I recently had my heating system replaced with a high efficiency system. Choose a venting method for more information on what you may need. Most home water heaters have a 3" draft hood outlet, even if vented in 4". Why are direct vent water heaters so expensive? I have helped install a chimney liner on two occasions. Liners are sized based on the value, in BTU's they are venting and the height of the chimney. © 2021 Endeavor Business Media, LLC. A chimney liner is a flexible aluminum tube that connects to your furnace and/or water heater and has a rain cap on the top of it. 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Department of energy allows for one-minute of back-drafting for orphaned water heater,,! A masonry chimney heater have were both replaced by the current owners, and week! With furnace cement U.L., and then seal the increaser in place with furnace cement heaters had installed! Is air and water tight event will offer insight on the cold water line, protecting areas... Plant is filled with a terracotta liner installed new water heater and your 's! You trying to rip us off here than 88 square inches the gas hot water heater,,... When using natural gas include verification that the flue as possible smoke and ash keeps them out of your.... Have yet to discuss the worst: back-drafting is a kit that allows to! At least you couldnt until a few years ago interior area steel is suitable for wood burning appliances dense..