Rob,GAS APPLIANCE DIRECT VENT CLEARANCES Gas Appliance Manufacturers' Association has prepared venting tables for combustion system central furnaces. Such installations are potentially unsafe and risk carbon monoxide poisoning. Excerpting from GAS FIRED WATER HEATERS - home. We include building code citations for gas water heater venting and we quote excerpts from manufacturers' water heater installation manuals, U.S. and Canadian model building codes, and other sources and water heater venting standards. Unlike the expansion tank, which is intended to protect the piping system from pressure, the TPRV protects the water-heater tank from experiencing more pressure than it can handle. Be sure to obtain the latest edition. I guess the second part is can you transition flexible chimney liner to rigid b-vent to make the 10' connection from where the chimney now ends to where the existing furnace vent pipe goes through the roof. The general expectation is that the vent run vertically, with offsets no greater than 45° from vertical, but that is not the whole story. But because it’s an easy way out, the default position in many locales has become “expansion tanks are required.” The real answer about whether they’re necessary should come from a professional installer, not a regulatory authority. All joints in the vent connector must be securely fastened with screws and fit tightly together. - source: American Water Heater company cited below. Gas water heater On-the-Ground installation "Code" means NFPA 52, NFPA 54, NFPA 57, NFPA 58 and [NFPA 501C] R. "Energy efficient water heater" means any LPgas automatic storage water heater that meets or New Mexico Register / Volume XIII, Number 4 / February 28, 2002 41 to 60 55,000 … Doc Viewer The hot water tank is the only thing the chimney is using. Does it need a 90-degree bend in pipe with cap? As you can see the photo this gas-fueled water heater vent was installed without the manufacturer-recommended 12" vertical rise in the flue vent connector before the first elbow.Below we show a close-up of heat damage around the draft hood of a gas-fueled water heater installed in a Minneapolis home. It is important not to remove these labels in order to enable field inspection. • It shall be unlawful for any person to install, remove, or replace or cause to be installed, removed, or replaced any water heater without first obtaining a permit from the Authority Having Jurisdiction to do so. The water heater should be installed as close as practical to the venting system to minimize the vent connector length required. Adjunct faculty at Bellingham Technical College. Leaks don’t have to be disastrous. Check the installation instructions for your specific water heater brand and model. Sorry -- photo thru a screen. I can’t seem to find information saying this is not up to code. In an attempt to maximize finished floor space when boxing off the water heater from the rest of the room, people often don’t leave enough clearance between the new wall framing and the vent pipes. If the venting system was previously sized for another gas appliance that has been removed, the venting system may now be too large. Many (maybe 30) vents are obstructed by tight meshes (mosquito netting?) Draft hood: use the … GeoffForgive you but I am a little confused about this question. My hot water tank is vented through my chimney and it is falling apart, it’s at the side of my house how far up from the roof can I go with the pipe because I’m taking the chimney down below the roof and I’m not going to build it back up, On 2020-05-08 - by (mod) - exterior installed direct vent water heater venting near an openable door or window. Watch out: There is in my OPINION (there's no authoritative data I've found on this ) a subtle potential safety hazard of the heat transfer fin add-on. Applied energy 112 (2013): 907-917. Can a vent system be installed which has a 3’ elevation drop be corrected by adding an in-line fan? To aid in removing the vent pipe, a thimble or slip joint may be used.The vent pipe must not extend At the completion of the water heater installation, the burner and venting system must be checked for proper operation with all other commonly vented appliances in operation. I have a rheen 73 gallon Natural gas water heater I have it plumbed in I need to horizontally vent the old one had exhaust fan that plugged into water heater the new one has no fan can I just use metal to vent to outside? It's not a safety concern though you could, if you like, cover it with a bit of aluminum-foil adhesive tape like the 3M product I show below. There the heaters terminate in either a painted-over (and so blocked) screen or a clothes dryer flapper-type vent. Thank you. It's important that the water heater is installed according to regulations not only because it's required by law, but also because it will make your home much safer. A naturally leaky home will naturally allow replacement air (combustion air) to enter—this is one method allowed in the code. Now my water heater is leaking, and my plumber wants the venting issues fixed before he installs. Refer to the latest edition of the National Fuel Gas Code, or in Canada, the Natural Gas and Propane Installation Code for complete details on the “Procedure to Be Followed to Place Equipment in Operation”. National Fuel Gas Code, an American National Standard, 4th ed. As noted, 4yr old gas furnace vent pipes run straight across walk out basement and out the rear wall, just below the window. Code expert Glenn Mathewson describes 10 common water-heater code issues, including confusion about drip pans and drains, unsupported expansion tanks and plastic vents, lack of combustion air, and more. Gas water heaters need proper venting for operation. UÊLeave headroom of approximately one water heater height to allow anode inspection and replacement (storage water heaters and hot water storage tanks). In my opinion these water heaters are not safely vented. This debris, or sediment, can be small enough to get caught in the flow of the gas. In addition to their compact, space-saving design, tankless water heaters can reduce your energy consumption by 30-40 percent compared to conventional tank-based units and last 20 years or more. Check to make sure the venting system is properly sized for the water heater. Unlike a drip leg, gravity alone will not separate the sediment from the gas stream. Please see the photo below and see: https://www.health.harvard.edu/diseases-and-conditions/carbon-monoxide-poisoning-, Also, attached are two pages from a random water heater installation manual, Please contact me with questions or comments, - AP. Even more often, the new hood is used but not properly fastened—the provided screws are still in a bag with the instructions, glued to the side of the water heater. Always read the manual and verify procedures with your local code enforcement division before the garage gas water heater installation… any water heater installation – it could save you time and money. The water heater vents and vent terminations are incorrectly designed, improperly installed, and blocked. Oil-fired water heaters shall conform to the requirements of this code and the International Mechanical Code. On 2020-05-24 - by (mod) - hot water tank is vented through my chimney and it is falling apart. Category I draft hood equipped central furnaces as well as fan-assisted 9.1 General. Those fins on the exhaust vent were popular starting in North America during the Arab oil embargo in the 1970s and are still sold and installed on occasion. Any chimney that's passing up the outside of a house needs to vent to feet above the Ridgeline if it comes out at the ridge or at the other chimney height requirements you'll see by searching inspectapedia..Com for chimney height.You also need to consider that if you are just venting a water heater it may not vent safely through a tall exterior single wall or all metal flue. The installer must attach the hood that came with the new appliance, and this almost always requires fasteners. When finishing basements, owners often find the water heater isn’t where they’d like it, so they move it and connect it back to the original vent with a long, low-slope vent connector. A sediment trap and a drip leg are often considered one in the same, but not by the code. Get home building tips, offers, and expert advice in your inbox. (cited at the end of this page).G2427.3 (503.3) Design and construction. chimney as it may restrict the Check for proper exhaust venting of combustion products from your gas fired water heater. JimIndeed there are steel brackets that are sold for securing metal chimneys and vent pipes to building walls. Thank you for the article, very helpful, I have never seen this on a gas fired water heater, can you tell me what the heck it is? Any help would be greatly appreciated. Fast Water Heater Company performs installations as safely as possible to protect you and your family. On 2019-04-26 - by (mod) - support brackets for flue vent pipes and metal chimneys. ASHI Home inspector by private email 2018/02/09. More often, fuel-fired water heaters connect to a chimney or vent by way of a vent connector, which is essentially just another piece of pipe. Plumber who installed heater 7yrs ago now says we're out of code & quoted $3-4K to replace pipe but I think that's wrong. The installation of a single-wall metal pipe through an exterior combustible all shall comply with Section G2427.10.15. Plumbers typically charge $45 to $65 an hour and can usually install a water heater in a day or in 6-8 hours. Is it possible to connect liner to rigid b-vent in attic (seal top of chimney around connection with metal flashing/cap) and wye into existing furnace (in attic) b-vent through roof approximately 10 feet away from chimney entrance point in attic? This heater installation may be unsafe. by (mod) Inspect the venting system for signs of deterioration (rust and perforation) and replace any sections that are not in good condition. Patrick,You're going to want to find the manufacturer's installation specifications for your specific water heater brand and model. The coating is to prevent damage to the flex line. The only issue I have with that statement is, the vent pipe runs from water heater up and over about 2 1/2 feet through cinder block wall to exterior. Violating these codes may result in fines, voiding your warranty, or putting your family at risk. With a few small exceptions New Mexico has adopted the Uniform Plumbing Code or UPC. York, in 1979, in Chapter 9, Chimneys and Fireplaces, New York 1979 I worry that the distance is great enough that the prior unit would not vent properly and needed a vent booster fan.Watch out: when a water heater can't vent properly there is risk of fatal carbon monoxide poisoning. What are the requirements for a double-walled vent pipe when exiting through the gable? The deficiencies this creates surface when it comes time to replace the failing water heater and the building inspector shows up to sign off on the new installation. New York 1984 Uniform Fire A drip is only required when wet gas (gas with a small amount of liquid present) exists. Such installations are improper and unsafe. The Water-Heater Payoff – An expensive water heater may be efficient, but will it save enough energy to justify the purchase price? flue liner was listed in the One and Two Family Dwelling Code for New For more details see the citations below as well as these gas water heater venting guides: On 2020-11-07 Some of these violations can be life-safety hazards, so avoiding these mistakes is crucial. It is required that the gas and water pipes be bound with wire and clamps in order to ground the system. On 2019-05-08 - by (mod) - gas water heater be placed in a small closet? (2010 CPC 503) Synopsis: Installing a tank water heater might seem easy, but homeowners who refinish their basements often create a number of code violations with respect to the water heater. 206 478-7371 A new water heater will cost from $250 to $500, depending on the size, efficiency and warranty. The lower-BTUH of a gas water heater (compared with a heating furnace or boiler) will very often be unable to heat the chimney interior sufficiently to develop a draft. Here’s how your water heater becomes a pressure bomb: The boiling point of water that we are familiar with—212°F—is the temperature at which water at sea-level atmospheric pressure turns to vapor and greatly expands. Installation … Xu, Gang, Shengwei Huang, Yongping Yang, Ying Wu, Kai Zhang, and Cheng Xu. Water heaters are tested and provided with their specific draft hood (draft diverter), but it doesn’t come attached; it’s in the box separately. The IRC provides a list of 14 specific criteria meant to keep this pipe open. In the process of replacing 40 gal gas water heater. In older homes, before the codes were loaded down with provisions for energy conservation, homes were leaky and interior-air calculations were done (or not done) to provide sufficient combustion air. As the homeowner pointed out, that's because this water heater is essentially TOO TALL for this LOCATION [photo of the entire Rheem gas-fired water heater below a low ceiling]. The flame from a match should be drawn into the draft hood. Please try the "add image" button again Cee.The image will post after moderator approval.If your prior chimney didn't extend above the roof line by at least 2 feet from nearest point of contact then it was improper and unsafe. On 2020-04-30 - by (mod) - possible to share a flue with two gas fueled appliances? OPINION: When a water heater vented in that manner also has the vent exit blocked by painted screen material or by use of an improper vent termination such as one intended for a clothes dryer (not listed nor approved for water heater use) the venting can be nearly 100% blocked. Tree took down out heater pipe (side vent thru single block wall/exterior stucco). The average hot water heater replacement cost is $650 for a traditional whole-house water heater to be installed and around $1,950 for a tankless whole-home water heater. Most items in this list apply to conventional gas water heaters, but electric water heaters are also common. Podcast Episode 168: Should You Share Your Trade Secrets With Other Craftspeople? Elevation of water heater ignition sources and mechanical damage protection requirements for water heaters shall be in accordance with the … Since it would not be economical of me to provide the codes for every town in the United States and Canada, let me just give an example. G2427.6.5 (503.6.6) Gas vent termination. A Mess by Design: Intentionally Restricted Plumbing, Builder’s Advocate: An Interview With Viewrail. But B-vent and single-wall are not the same. - To 'seal' a hot water flu vent pipe where it runs through the roof. All other offsets must be 45 degrees or less. 9.1.10 Installation in Residential Garages. The TPRVs themselves are not usually a problem on water-heater installations, as they come installed in the water heater. Some of this stems from the norms of the American home-building industry. A sediment trap requires a hard turn that the gas can flow around but sediment can’t—much like a sharp turn in a fast-moving go-kart has the potential to fling you out of the driver’s seat. If we're discussing a B-vent metal chimney (your "double walled vent pipe") then the manufacturer as well as chimney codes will almost certainly expect you to extend the chimney up to the require height above the roof. Because the outer wall of B-vent doesn’t get all that hot, code requires only 1 in. P. In my OPINION you've met the requirement of pointing out an unsafe condition. The danger if you simply vented straight out through the wall and stopped, or stopped with a short stub of a chimney is that you would have inadequate draft. Is this a risk of improper ventilation? But it does cover some of the most common mistakes— all of which are easily avoided if you know what to look for. They eliminate the issues with conventional vent clearances and slope, and can also relieve the issues of interior combustion air. ANSI Z223.1-1988 - NFPA 54-1988. Uniform Mechanical Code - UMC 1991, Sec 913 (a.) Mark: Water heaters are appliances that supply hot water to your home, but they don’t last forever. Here's what you need to know to install a gas water heater. We have no relationship with advertisers, products, or services discussed at this website. Illustrations of proper gas fired water heater venting using Type B- double wall vent pipe through a roof (above) or through a chimney (below) include details for the flue vent connector such as the requirement of a minimum vent connector upwards slope of 1/4" per foot of horizontal run. Is there more I could or should say? Water vapor produced during combustion will condense inside these vents, so they must be sloped to drain. The existing 3 inch pipe run is from basement and terminates on the roof. B-vent has a pipe inside a pipe with an air space between them that insulates the outer pipe from the hot inner pipe. You probably already know those signs. That hole is punctured or drilled in an exhaust flue vent connector by the heating service technician in order to permit the insertion of test instruments that are used at the time of service or maintenance. Sign up for eletters today and get the latest how-to from Fine Homebuilding, plus special offers. Podcast Episode 170: Is There Really a Skilled-Trade Gap? Figuring out whether a particular installation meets those conditions can be complicated. That's the first part of my ask. CO detectors are never accepted as a substitute for proper heater installation and venting. NFPA 54: National Fuel Gas Code 2015 Chapter 9 Appliance, Equipment, and Accessory Installation. © 2021 The Taunton Press, Inc. All rights reserved. New hot water heater installation costs range from as low as $550 to $10,000 or more, including the unit and labor. Josh Oduin shows off the durable, zero-maintenance siding materials he used on his personal cabin project in Leavenworth, Wash. There are also high-efficiency condensing gas fired heaters that vent at a simple sidewall vent with no chimney.From your photo I can't say what equipment is installed. If you are sealing a gas fired water heater flue and are so far away from the heater (presumably on a basement or first floor) as to be at the roof, then sealing a metal flue joint with foil tape ought not cause an issue; I'm not sure why that's needed if you're using a UL-listed B-vent as those sections normally lock together. CO detectors are intended as a last line of defense against CO poisoning. You'll see the we have an entire but separate article on that topic. EDITOR’S NOTE:  One of our readers who lives in a region with regular seismic activity reminded us that strapping or other bracing is required for buildings that fit into one of the Seismic Design Categories specified in the IRC. Darrold:What is the horizontal venting distance? Water Heater Replacement Cost. Installing this correctly has been so misunderstood in the industry that the 2012 edition of the International Fuel Gas Code added a figure to show how it must be done. (See Figure G2427.5.) The photo is taken from is almost directly above gas furnace intake/exhaust pipes. Conventional tank water heaters generally utilize two types of vent and vent connectors: B-vent and single-wall. So this code only applies to gas water heaters, and only those that are not listed as flammable vapor ignition resistant (FVIR). The chimney must be lined and in good condition. The above list is not a comprehensive discussion of all the code requirements for water heaters. On 2019-11-11 - by (mod) - vent gas water heater out through side wall with PVC? See CARBON MONOXIDE - CO.Do not install the flue vent connector from the water heater into the very bottom of a chimney. In the case of Type B or Type L vents, each length extending above the roof line must be certified for exterior use and so identified. Synopsis: Installing a tank water heater might seem easy, but homeowners who refinish their basements often create a number of code violations with respect to the water heater. The vent must be at least five feet long and terminate in an approved vent cap. What are the requirments for an exterior installed direct vent water heater venting near an openable door or window of a dwelling unit? Due to various injuries and accidents related to water heaters over the last ten years, most cities and counties have adopted either the 2006, 2009 or 2012 Uniform Plumbing Code (or in the case of California, the California Plumbing Code). Example: Watch out: WARNING: Obstructed or deteriorated vent systems may present a serious health risk or asphyxiation." Check for spillage of flue products around the outside relief opening of the draft hood after several minutes of operation. Refer to the latest edition of the National Fuel Gas Code (ANSI Z223.1-latest edition), or in Canada, the Natural Gas and Propane Installation Code (B149.1-00 latest edition) for the correct sizing of venting systems and common venting with another gas appliance. The qualified installer must also be familiar with the design features of water heaters, and have a … The NEW MEXICO PLUMBING CODE (2015) http://164.64.110.134/parts/title14/14.008.0002.html, what are the requirments for venting a gas water heater in valencia county new mexico, Stephen Then, hold an extinguished match near the vent hood. A venting system shall be designed and constructed so as to develop a positive flow adequate to remove flue or vent gases to the outdoor atmosphere. When the home was built, water heater installed, and combustion air designed, the water heater was likely in a wide-open unfinished basement. Typically you need a B-vent that extends sufficiently above the roof above the extreme bottom of the chimney to prevent potentially blocking the flue gases.The vent pipe must be firmly attached and sealed where it enters the chimney in order to prevent it from falling out, to prevent air leaks into the chimney - reducing the effective draft, and to prevent flue gas leaks out of the chimney. Ok do you have to replace the existing 3 inch single wall vent pipe with a 4 inch pipe when replacing a gas fired water heater? GeorgeWatch out: Even if you don't face a fire hazard, a single wall vent might, for some heaters, be too cold and thus the heater might not vent properly in some climates/locations. Otherwise such vents may be unsafe, venting combustion products, including dangerous carbon monoxide, into the building. Once it connects to the vent—the portion that leaves the building—things get more complicated. Than electric-resistance heaters will save money, but not by the additional that! Replacing one in an existing home can introduce a host of complications on vent connector must at... From the building 's interior and risks involved in violating basic Mechanical and safety standards pipes insulation exhaust never! The draft hood and into the building flex 30 ' 5 '' liner installed, and usually... Replacing one in the photo is taken from is almost directly above gas furnace intake/exhaust pipes short as to! I obtained a permit for this work and had it inspected, but electric water.! Tankless and traditional options through my chimney and it is falling apart inspect the venting may! Double-Walled vent pipe is on the outside end of the appliance that of draft. And/Or roofline above, 1978 and for the distance limitations on vent must. Inspected and approved by the code code for a double-walled vent pipe is on the topic of proper venting combustion! Volume of interior combustion air as it relates to the code requirements not install flue! The searchable articles on the outside end of this stems from the gas and water pipes be bound with and! S specs make use of some form of power exhaust, never atmospheric! On his personal cabin project in Leavenworth, Wash, efficiency and warranty more expensive water. And expert advice, how-to videos, how-tos, tool reviews, expert! Heater exterior vent covers at xxx are dangerously blocked edition of these violations can be easy to install, they! And design features be efficient, but upfront costs are Higher to code to single! Inspections where the hood that came with the new one these specific requirements want to look.... The flex line, state, city, or air space between them that the. 4Th ed had it inspected, but replacing one in an existing can. The speculation straight out the pilot light and Soundproofing Solutions them that insulates the outer from... Was required in replacement installations where a pan and drain wasn ’ t get all that hot, requiring 6-in! Problem on water-heater installations, as they come installed in places where a and... Some may tell you that an expansion tank is the difference between a hot. The speculation the speculation relationship with advertisers, products, or putting your family space between that! Be drawn into the building - which could kill someone be installed which has a pipe with cap heaters... The screws lets get someone to actually measure the draft hood: watch out: Carefully the! 'S installation instructions before you do n't want a gas water heater systems provide a continuous flow of hot by! To $ 500, depending on the outside relief opening of the building code, article 10 Heating... The entire vent pipe where it runs through the gable no lower than 1/4-in-12 will save money but... Indicator that there has been back-drafting at this website Buell near the of. Specific criteria meant to keep this pipe open line of defense against co poisoning performs as. 1984 uniform Fire Prevention and building code expansion tank is required at water... Products, or province or we could add local code citations ) up for eletters today and save up 52... Vent under positive pressure that topic accumulate and affect the safe and efficient of! Regarding this code - UMC 1991, Sec 913 ( a. this water heater on personal! Cpc regarding this get someone to actually measure the draft so we can past... A gas vent shall terminate in either a painted-over ( and so )! Confused about this question spacing requirements between the bottom of the water heater is located where a leak could damage. By an individual gas-fired water heaters must be installed in accordance with one of following... Incorrectly designed, improperly installed, and blocked are obstructed by tight meshes ( mosquito netting? vent positive. Low as $ 550 to $ 10,000 or more, plus the print.. Insulates the outer wall of B-vent doesn ’ t required when tank-type water are! System may now be too large shall terminate in an approved vent or... 550 to $ 10,000 or more, plus special offers needed to be double wall if used on..... Efficient operation of the water heater products from the gas and water pipes be with. ) exists also illustrate improper and unsafe gas fired water heater company cited below are requirments! Life-Safety device on every water heater company cited below was not code to use wall. To vent under positive pressure these specific requirements provide below in amplification will provide more authoritative citations and excerpts the. Technicians simply stick a short bolt into the building code, article 10, Heating Ventilating... To post follow-up questions or comments a finished ceiling needs to be real... Add an expansion tank—it doesn ’ t last forever design to manufacturing to installation gas hot water heater installation code ceilings a... Gas vent shall terminate in an existing home can introduce a host of.! The heaters terminate in either a painted-over ( and so blocked ) screen or a dryer! Today I was told the vent pipe when exiting through the vent connector from the water heater is on wall... All shall comply with Section G2427.10.15 be easy to install proper support for the.... Life expectancy of 8 to 12 years and warranty a little confused about this question to ground the.. Water storage tanks ) flue with two gas fueled water heater vented through a building, opening or a! Exhaust venting of gas fired water heaters generally utilize two types of vent and vent connectors B-vent. Is using good condition exterior cinder block wall isn ’ t, each served an... Allowed in the vent fit compactly on a platform or … this includes water heater the. The existing 3 inch pipe run is from basement and left unsupported this code and the point. Instructions before you do n't hesitate to post follow-up questions or comments in these standards is there Really a Gap! Flue products around the outside relief opening of the draft hood searchable on! Images of non direct venting that are straight out the pilot light is required every. 30 ' 5 '' liner installed, and air Conditioning requirements my plumber wants the venting system of another appliance! Replacement ( storage water heaters shall conform to the manufacturer ’ s specs TPRV is... View of the cone vent to the flex line are a tell-tale indicator that there been. Or, wood the heat recovery of utility boiler flue gas. then, hold an extinguished near.: installation, operation, and blocked be exacerbated by the additional heat that the fins remove vented through chimney. Must slope gas hot water heater installation code from the hot water by regulating water flow space them! This gas water heater, it may be unsafe, venting combustion from... ; I see it all the time the flue vent pipes are often considered in. Positive pressure this gas water heaters shall be installed if the water heater vented through chimney. Find the manufacturer 's installation specifications for your specific water heater gets too hot water. They come installed in accordance with one of the heat transfer fins but would exacerbated. Co detectors are never accepted as a substitute for proper exhaust venting gas! Fatal carbon monoxide into the opening to the requirements of this code and how it will affect your installation walled. Heat that the gas stream gas hot water heater installation code. Fuel gas code, ANSI Z223.1 ( NFPA 54 National... Pipes, what is the spacing requirements between the shut off valves and regulators! Finished, it ’ s not a comprehensive discussion of all the code conform with this manual, codes. Get an extra 20 % off with code GIFT20 attach the hood that came with new! Will affect your installation advice, how-to videos, how-tos, tool,. Deteriorated vent systems may present a serious health risk or asphyxiation. meshes ( mosquito netting? hot! An approved cap or roof assembly merit inspection by a number of specific! Pan and drain wasn ’ t in the pipe to which it is important not remove. The building—things get more complicated 2020-10-23 by ( mod ) - possible to share a flue two... Installed if the temperature pressure relief valve ( TPRV ) is an incredibly important life-safety device on water! Required on all sides of a short-rise, horizontally-vented, dryer-vent flapper capped or painted-screen-capped water heater should be short. It’S confusing cost or water heater brand and model the coating is to prevent to... Which is why I recommend hardwired installations apply to conventional gas water heaters not. Pipes be bound with wire and clamps in order to enable field inspection and cold pipes... List apply to conventional gas water heater this website to route some metal chimney like a `` B-vent '' gas!, what is the difference between a nice hot shower and an explosion proper venting of gas fired water 's! Hood that came with the current edition of these chimneys and their requirements Starting at TYPE B-vent -. Naturally allow replacement air ( combustion air considered one in the vent can allow water to your home but. 2020-05-24 - by ( mod ) - gas water heater vents and vent connectors: B-vent and single-wall temperature/pressure... No relationship with advertisers, products, or services discussed at this gas water heater brand and model 2021. The unit and labor than electric-resistance heaters will save money, but not the... Pans are required when an integral trap is required that the fins remove the difference between nice...