ao smith tankless water heater dip switch settings ao smith tankless water heater dip switch settings

It is equipped with an ignition device which automatically lights the burner. [The set temperature increases if the Temperature control knob is turned clockwise]. For some issues, for example, the light blinks 3 times. Tanks, A. O. Smith 240V / 32 kW 4-Chamber Tankless Electric Water Heater, A. O. Smith 240V / 28 kW 4-Chamber Tankless Electric Water Heater, A. O. Smith 240V / 24 kW 4-Chamber Tankless Electric Water Heater, A. O. Smith 240V / 22 kW 4-Chamber Tankless Electric Water Heater, A. O. Smith 240V / 18 kW 2-Chamber Tankless Electric Water Heater, A. O. Smith 240V / 16 kW 2-Chamber Tankless Electric Water Heater, A. O. Smith 240V / 14 kW 2-Chamber Tankless Electric Water Heater. Such comment triggers my inspiration to create more helpful contents. Owner's Guide Operating Safety DANGER Vapors from flammable liquids will explode and catch fire causing death or severe burns. A. O. Smith Electric Tankless Signature Series: Heating water only as it is needed means you will never run out of hot water again. You can be sure it will live up to your expectations. AO Smith AOSRE50603 Residential Electric Water Heater Instructions PROLINE SPECIALTY ELECTRIC COMMERCIAL-GRADE RESIDENTIAL TABLE TOP Features a convenient, Rheem Tankless Water Heater User Manual Rheem Tankless Water Heater User Manual FAQS What's in the box Fittings,, Rheem Electric Water Heater User Manual - Download [optimized] Rheem Electric Water Heater User Manual - Download, Your email address will not be published. When installing the vent system, all applicable national and local codes must be followed. 1800-103-2468/1860-500-2468. Understanding an error code might mean you can fix the problem by simply pressing the reset button, rather than calling out a professional technician. We don't tend to provide any plumbing advice or any advice that should come from a certified professional. document.write(intYear); This water heater should not be operated with insufficient amount of water. The first step is to turn off all the electrical connections to prevent the short circuit. The Heating indicator lamp will glow. document.write(intYear); You will need a screwdriver to complete the task. This continues today through our robust line of residential water heating, water filtration and water softening products. Signature 100 40-Gallons Tall 6-year Limited Warranty 4500-Watt Double Element Electric Water Heater. Model: GT15-510U-O Straight Pipe 87 Elbow (100266132) 6. For more information about our products, visit www.aosmith.com/watertreatment. If, during such service, it is necessary for the Company or Authorised service provider to replace or repair defective components or parts, the customer shall be required to pay for the same as per the Companys prevailing price list. 10) Tug downwards on the water heater to ensure that the water heater is fixed steadily. The goods shall mean the goods described in the purchase agreement. The Freeze Protection System only works if the unit has electrical power. The 510 series displays the error code on the LCD display. 3. The pressure switch would fail to close properly, which would cause your AO Smith heater to blink 3 times. This can happen if you disconnect the remote from the heater while the power supply is on. When it comes to high efficiency water heaters, no one comes close to matching our expertise. Installation Manual Introduction INTRODUCTION This manual provides information necessary for the installation, operation, and maintenance of the water heater. Save my name, email, and website in this browser for the next time I comment. All rights reserved. A. O. Smiths India plant has extensive engineering and technical resources and has the latest technologies incorporated. 1/2" 172 3/4" 360 1" 1 1/4" 1 1/2" 2" 20' (6.1) 118 Length: ft. BMS (Building Management System) As the water is heated, it expands and tries to flowback through the inlet pipe but is prevented by the presence of the non-return valve. Try our Product Selector Tool to find the right models for your needs-for both heating and treating your home's water. var intYear = dteNow.getFullYear(); Invoice shall mean the Invoice issued for the Unit by the Company or Authorised Dealer to the customer describing the goods and indicating, inter alia, the total purchase price thereof, the name of the customer and the place where the goods are to be installed. Failure to follow this instruction can result in property damage, serious injury or death. A. O. Smith Gas Tankless Signature Series: Heating water only as it is needed means you will never run out of hot water again. Place the water heater on the Hanging screw through wall mount bracket. Concentric Roof Termination 4. F(C) Incoming Temp. Verify that the items listed below are included with the remote controller 100209924 (TM-RE42). Smith connecting hoses. Owner's Guide Normal Operation -Measuring inlet gas pressure1. Ideal hot water delivery for households with 2-3 people when sized appropriately. Temperature can be adjusted from 25C to maximum 75C. Instruction Manuals. AO Smith Tankless Error Codes and Troubleshooting, The numbers that are displayed on a remote control, The numbers that are shown on an LED display, How many times the warning light will blink. How to check and change your Navien tankless water heater DIP switch settings and parameter settings. Forced or attempted repair may result in a fire or explosion due to gas leaks. Do Not Ninstall or attempt to repair any damaged component parts. D-2) 6. steve and terry andrianos; sf ferry building wifi password; homes for sale in marion county, tn by owner; how to summon rhino island saver; yard hostler training Turn off all electric power to the water heater if service is to be performed. Type of unit Unit # of easy-link Parent 1 Child 2, 3, or 4 10. The Heating indicator lamp glows as shown in (Fig. Smith GDVH Owner's Manual, Water Heater A.O. There are even certain. (Of course, they acted like it was a faulty unit and not admitting the water too low) And now, I know how to check and adjust the settings, and already feel like I know more than them. Today, A. O. Smith Corporation is one of the largest water heater manufacturers in the world and is a global leader in innovative technology and energy efficient solutions. Cras luctus posuere enim. From water filtration to water softening, our products are obsessively engineered to provide you with clean water. In case the customer does not wish to enter the Service Contract, he has an option to call our Customer Care Centre and get A. O. Smith water heater unit serviced on actual basis i.e. On-Demand Gas Tankless Water Heater Service Manual Series 100/101 & Series 200/201. Blue Diamond Glass LiningBlue Diamond technology increases the life of the inner tank. Please read all installation instructions completely before installing this product. B. Installation Manual Installation Installation and service must be performed by a qualified installer (for example, a licensed plumber or gas fitter). Switch OFF the electric supply to the water heater. Installation Manual Safety Guidelines SAFETY GUIDELINES SAFETY DEFINITION DANGER WARNING CAUTION NOTICE Indicates an imminently hazardous situation which, if not avoided, will result in death or serious injury. Owner's Guide Operating Safety OPERATING SAFETY FOR YOUR SAFETY READ BEFORE OPERATING WARNING: If you do not follow these instructions exactly, a fire or explosion may result causing property damage, personal injury or loss of life. Commercial Gas Tankless. Anode is not included under warranty, the service life of the Anode is determined by the quality and quantity of the water flowing through. The way this thing works is once it calls for heat, the blower motor will kick on and the switch is in the open position and once it gets rolling at full speed and there is sufficient air, the switch will CLOSE and it will fire up. Open the main gas supply valve to the unit using only your hand to avoid any spark. As an Amazon Associate, I earn from qualifying purchases. Owner's Guide Normal Operation FREEZE PROTECTION SYSTEM This unit comes equipped with heating blocks to protect it from damage associated with freezing. The two holes should be aligned horizontally. Lowes Item #: 1055545, Model: R4LR-280E The contents of the discharge from the Multi-function Safety valve may be hot and may cause burns to the users and damage nearby objects if not properly routed to a drain. 5. This issue may potentially be caused by an inadequate intake supply, a clogged inlet or aerator, or both. Then, set it to your desired temperature setting. When ON, the STAND BY LED is lit. There has been a failure in the inlet thermistor. A. O. Smith ZIP Tankless Water Heaters are the perfect solution to revolutionize your daily bathing routine. (76 mm) *24 inches (610 mm) recommended for maintenance. Whenever the water heater is not used for an Figure 20 extended period, unplug the unit and drain. Lowes Item #: 1055570, Model: GT15-540-PI Model Top 110C 310C 510C Bottom Front Back Front Back Side Sides 12 in. AO Smith Gas Water Heater Temperature Adjustment Follow the below steps to adjust the temperature of your AO Smith Gas Water Heater. Find the right water heater for your needs. CAUTION: Please turn off the power supply to the water heater prior to draining the water heater. If the problem does not solve after checking the following issues, call Customer care centre. The A. O. Smith plant with manufacturing facilities spread over 76,000 sq. The Companys liability under the warranty will be limited only to defects which occur under conditions of proper installation, normal operation and under proper use. Different models has different service delivery levels. If there is a problem with the installation or the unit, the error code will be displayed on the temperature controller and remote controller. At this point, take off the insulation. Water Heater Expansion Using heat pump technology to keep usage down, it gets . Always install, operate, inspect and maintain this product in accordance with all applicable standards. : 140,000 Min. For instance, if you are seeing the error code 10, look for vent blockages, ensure that the distance between the intake and exhaust terminals is as specified in the instructions, and clean out the fan motor and gas burner if you notice dirt or grease build-ups. Press and release either the Up and the Down button to increase or decrease the water temperature. WARNING The manufacturer does not recommend installing the water heater in a pit or location where gas and water can accumulate. Installation Manual Installation EASY-LINK SYSTEM (Available on the 510C model only) The 510C model water heaters can be connected together to work as a multiple-unit manifold system. When you shop through links on our site, we may earn an affiliate commission. GTS-305-NE water heater pdf manual download. 50F(10C) 40F(4C) 50F(10C) 60F(16C) 70F(21C) 100 (38) 105 (40) 110 (43) 115 (45) 120 (50) 125 (52) 130 (55) 135 (57) 140 (60) 3.7 (14.0) 4.4 (16.7) 5.5 (20.8) 6.6 (25. Ensure that the free end of the Discharge tube is placed over a suitable drain and away from the users. Thankfully, AO Smiths tankless heaters provide an error code when something goes wrong. Wait a fair amount of time for the water to heat up. Do not have the vent terminal pointing toward any opening into a building. Inspect the water heater and its component parts for possible damage. Owner's Guide Normal Operation TEMPERATURE SETTINGS -Set temperatureScreen on the controller Operation Built-in controller 1. A. O. Smith Issues 1st Quarter Financials. Press the UP button for increasing temperature. A communication cable (gray color) comes with each 510C model. Smith Water Heater Reviews (2023 Guide), Bradford White Tankless Error Code Troubleshooting, Knowing Your Bradford White Water Heater's Age is Key to Maintaining Its Performance, Stay Warm and Save Money: Best Bradford White Water Heaters. INSTALLATION GENERAL 1. Follow all local and national codes in regards to proper termination clearances. Lowes Item #: 1055579, Model: GT15-340-PI Manage Settings var intYear = dteNow.getFullYear(); drill 2 holes at least 90mm deep in the wall (Fig. In this case, check the manual. There is a problem with the gas solenoid valve. prevent it from dripping or releasing the excess pressure inside the heater. *Flexible Hoses to be procured by the customer, not part of standard product. Presence of organic matter in input water. (kg) 51 (23) inch mm H 20.5 x W 13.7 x D 10. There is a failure in the gas solenoid valve drive circuit, hi-limit valve, or overheat cut off switch. Set the Gas Valve To Your Desired Temperature Setting Locate the gas control knob on the gas valve of the unit. He obtained his Bachelor of Science degree from the University Of Texas at El Paso. A. O. Smith Glass Coating helps to prevent scale formation and extends the life of the heating element.Anode RodThe tank has an anode rod which has stainless steel core that is designed to protect the tank from corrosive elements. Failure to follow these steps could lead to fire or explosion, resulting in personal injury or death. When installed, the remote will take priority over the built-in controller. The cover plate must then be located and removed. AO Smith water heaters comply with all the necessary safety regulations and have excellent lifespans. Installation Manual Installation 3. Setting temperature on AO Smith Hybrid Water Heater is a piece of cake. Thank you for this very informative article and files. Installation Manual Installation WATER CONNECTIONS WARNING NOTICE Do not use this appliance if any part has been under water. Required fields are marked *. : 190,000 Min. Commercial Heat Pump. Then, set it to your desired temperature setting. If you detect any Ndamage in the water heater, please contact the dealer where the water heater was purchased or call A. O. Smith Customer care. damage to water heater at customer house during installation or serviceable procedures by unauthorised service technician. Before use, we recommend that you read through this owner's guide carefully. This cutting edge technology prevents sediment and scaling, fights corrosion and extends the life of your water heater. If you would like to change your settings or withdraw consent at any time, the link to do so is in our privacy policy accessible from our home page.. On-Demand Water Heater Installation Manual and Owners Guide Models R D R ANSI Z21.10.3CSA 4.3 510C model only 110C 310C 510C If the information in these instructions is not followed exactly, a fire or explosion may result causing property damage, WARNING personal injury or death. 10.5 (2.61) lbs. The built-in Easy-Link System allows up to 4 units to manifold together (connected with communication cables). Commercial Gas. D-1) 5. Energy Factor: 0.95. AO Smith Hybrid Water Heater Temperature Adjustment, AO Smith Electric Water Heater Temperature Adjustment, AO Smith Electric Tankless Water Heater Temperature Adjustment, AO Smith Water Heater Temperature Settings, AO Smith Electric Water Heater Troubleshooting, AO Smith Gas Water Heater Troubleshooting, AO Smith Hybrid Water Heater Troubleshooting, Rheem Water Heater Failed Ignition Lockout [A Troubleshooting Guide], AO Smith Water Heater Too Hot [How To Fix], Basement Watchdog Battery Alarm Add Distilled Water, Basement Watchdog Battery Alarm [Corroded Terminals Or Bad Battery], Basement Watchdog Pump Was Activated Alarm. Installation Manual Installation CLEARANCES Top Side Maintain all clearances around the water heater. O. Smith India Water Products Private Limited(formerly known as A. O. Smith India Water Heating Private Limited) Plot 300, Phase II, KIADB Industrial Area, Harohalli, Kanakapura Taluk, Ramanagara District, Karnataka 562 112, India. : 15,000 Max. Product installed in direct sunlight exposure or rain or non serviceable areas. Locate the temperature knob at the top of the circuit board. smith owner's manual gas water heaters gdvh, gdvs, xdvs (28 pages), A.o. Parts. It is recommended as per IS302-1 to have 6inches clearance from wall. (305 mm) (305 mm) (102 mm) (25 mm) Bottom 3 in. WARNING Adjust the appropriate DIP switches according to model and elevation as shown below. First hour delivery of 189 gallons of hot water. smith owner's manual gas water heater gpsh, gpcr (20 pages), A.o.smith gas water heater owners manual gpdh, gpdt, gpdx (20 pages), A.o. Available in condensing and non-condensing units to fit your needs. Smith Signature Series 6.6-GPM 160000-BTU Indoor Natural Gas Tankless Water Heater. Lowes Item #: 1055566, Model: R2VR-180E to each water heater in the Easy-Link System, in accordance with the table below. The model description is listed on the rating plate which is attached to the side panel of the water heater. (Fig. Find a separate socket for power plug and make sure the socket is in firm contact with the plug. Power of 1 valid service is applicable for calls registered at A. O. Smith call centre before 4 p.m. only. Some of our partners may process your data as a part of their legitimate business interest without asking for consent. Installation Manual Specifications SPECIFICATIONS Model Natural Gas Input (Operating Range) BTU/h 110C 310C 510C Min. Press the ENTER button to confirm your selection. The customer will have no claim under this warranty in respect of any personal injury, damage of property or consequential damages, or for utilisation of the goods not in accordance with the user guide, The inner tank and Heating element need to be cleaned for any deposits / scales periodically from an Authorised service technician. Place the Main body back on the Back plate, with the Remote controller cable running out of the bottom inlet. In order to purge air in water pipes within a closed-loop system, an air vent and air separator should be installed in the system. Installation Manual Installation When the built-in controller installed in the CHILD-2 unit displays a number, turn on CHILD-3. The Stand-By LED will come on if the controller is on. Open the hot water faucet until the water runs cool. A. o. smith gas water heaters specification sheet (2 pages), A. o. smith gas water heater specification sheet (2 pages), Power vent/power direct vent gas models with direct spark ignition (60 pages), Gas models power vent with hot surface ignition (21 pages), A.o. In Canada, follow the requirements of B149. Follow the instructions carefully and look forward to enjoying long years of trouble-free service.A. Enjoy continuous hot water for up to 3 simultaneous showers and 1 sink when sized appropriately (sink and shower calculations are based on a 0.5 GPM faucet and a 2.5 GPM showerhead in the southern zone) Save money and energy with our ENERGY STAR qualified Ultra-Low NOx indoor model that operates at a 0.93 Uniform Energy Factor (UEF) by paying the Labour Cost and Spares needed to attend to that Service or Complaint Call at the prevailing Company rates. If you need an additional manual, contact the manufacturer or your local distributor. I wanted to get the most efficiency out of my Navien W. Model: GT15-510C-I Two 4,500-watt copper heating elements provide a first hour delivery of 53 gallons. For more information, follow the procedures below: Screen on the controller INFO Button Operation 1st. These error codes correspond to a specific problem that might affect your heater, but this isnt much help if you dont know what they mean. If the Anode is consumed, it needs to be replaced by an Authorised service technician for efficient protection of the water heater. When you call, please tell us the product name and the serial number of your unit written on the rating plate of the water heater. Water dripping from Multi-function Safety valve during heating. The Company shall mean A. O. Smith India Water Products Private Limited. When the temperature of the water drops by 5C from the set temperature due to usage of water, the water heater again enters into heating mode. Tighten the two Fork terminals beneath the two Remote controller terminal screws on the back of the main body. press Inlet water temperature will be displayed on the remote controller by pressing the "INFO" button. Set DIP switches shown in the table below. This is an in-depth guide on AO Smith Water Heater Temperature Adjustment. The customer shall mean the original purchaser under the purchase agreement. WARNING Refer to "Freeze Protection System" on p. 37 for more information. Owner's Guide Troubleshooting EASY-LINK SYSTEM 510C model only BUIT-IN CONTROLLER and REMOTE CONTROLLER WATER HEATER PROBLEM SOLUTIONS Unit does not ignite when water goes through the unit. The Company or its Authorised service provider will be entitled to retain any defective part replaced under the warranty. : 120 F) Remote controller (EX. If you dont have a digital display, warning codes should be indicated by a blinking light. Save Energy, Space and Money. Lowes Item #: 1055567, Model: R4LR-220E It will reduce the risk of scald injury. Control circuit or internal wiring error. A. O. Smith is a company known for its innovative technologies and energy-efficient solutions. The most common problem with AO Smith tankless water heaters is the heater, not lighting. This will also make the warranty null and void. Automation. You can cycle through the available temperature set point quickly by pressing and holding down the Up button. Make sure you set the both upper and lower thermostats to the same temperature settings. In cases where power losses can occur, consider the use of a backup power supply. NOTICE Canadian requirements differ from the guidelines in this section. Follow the below steps to adjust the temperature of your AO Smith Gas Water Heater. Just follow the below steps and make the adjustment. A.O. So, lets get started without a second delay. I want to give it another week after adjusting the temperature to 140 to see if it has any other issues or has just been on the wrong setting. Finally, Very Hot temperature, what the name suggests, is the highest temperature setting on your AO Smith Water Heater. Before installing the water heater, confirm that the power of water heater matches electric meter capacity and supply wire. Owner's Guide Normal Operation NORMAL OPERATION BUILT-IN CONTROLLER and REMOTE CONTROLLER The illustrations below show examples of the displays of the controller. Model: R2VR-140E ** Multi-function Safety valve comes included with the Water Heater. There has been a failure in the outlet thermistor. Installation Manual Installation MULTI-UNIT SYSTEM Multiple 510C models can be combined for a Multi-Unit System, along with the multi-unit controller (Part 100112691 (TM-MC02)). Save Energy, Space and Money. Inlet water temperature 2nd. COURSES. Damage to the heat exchanger caused by freezing temperatures due to power loss is not covered under the warranty. Save Energy, Space and Money. A. O. Smith India Water Products Private Limited was established in 2006. Ours are the only water heaters with the Blue Diamond Glass Lining for the inner tank. This will prevent the water heater from activating properly. Indicates an imminently hazardous situation which, if not avoided, could result in death or serious injury. Installation Manual Initial operation INITIAL OPERATION FOR YOUR SAFETY, READ BEFORE OPERATING Check the GAS and WATER CONNECTIONS for leaks before firing unit for the first time. It is has to be installed indoor only. Smith electric water heater installed, you can adjust the temperature in a matter of minutes as long as you have access to the heater's panels. Commercial Electric Tankless. After checking, consult with the manufacturer. If you have any problems or questions regarding this equipment, consult the manufacturer or its local representative. Tanks, Tankless Non-Condensing Concentric Vent Indoor 199,000 BTU Water Heater, Tankless Non-Condensing Concentric Vent Indoor 190,000 BTU Water Heater, Tankless Condensing Ultra-Low NOx Indoor 199,000 BTU Natural Gas Water Heater, Tankless Condensing Ultra-Low NOx Indoor 180,000 BTU Natural Gas Water Heater, Tankless Condensing Ultra-Low NOx Indoor 160,000 BTU Natural Gas Water Heater, Tankless Condensing Ultra-Low NOx Outdoor 199,000 BTU Natural Gas Water Heater, Tankless Non-Condensing Ultra-Low NOx Outdoor 199,000 BTU Natural Gas/Liquid Propane Water Heater, Tankless Non-Condensing Ultra-Low NOx Outdoor 190,000 BTU Natural Gas/Liquid Propane Water Heater, Tankless Condensing Ultra-Low NOx Outdoor 160,000 BTU Natural Gas Water Heater, Tankless Non-Condensing Ultra-Low NOx Outdoor 140,000 BTU Natural Gas/Liquid Propane Water Heater, Tankless Condensing Ultra-Low NOx Indoor 199,000 BTU Propane Water Heater, Tankless Condensing Ultra-Low NOx Indoor 180,000 BTU Propane Water Heater. 1800-103-2468/1860-500-2468. The DIP switch settings depend on the altitude. 4.0 (1.00) Max. Product WarrantyYour A. O. Smith water heater is warranted against defects arising from faulty design, workmanship and materials for a period of 24 months from the date of the invoice, subject to the following conditions: JurisdictionThe courts of competent jurisdiction at Bengaluru, Karnataka shall have exclusive jurisdiction over all matters arising out of any disputes in relation to the product.Expert Company Service Power of 1, Warranty CardCustomer Copy to be retained by the CustomerInvoice Number: ___________________________ Dated: _________________________ Unit Serial Number: __________________________________Model: _________________________ Capacity: ______________________ Customers Name and Address: ______________________________________________ ___________________________________________________________________________ ___________________________________________________________________________ Ph: _______________ Mobile: _____________________ E-mail: ___________________Dealers Stamp and SignatureCompany Copy to be sent back to the CompanyInvoice Number: ___________________________ Dated: _________________________ Unit Serial Number: __________________________________Model: _________________________ Capacity: ______________________ Customers Name and Address: ______________________________________________ ___________________________________________________________________________ ___________________________________________________________________________ Ph: _______________ Mobile: _____________________ E-mail: ___________________ Dealers Stamp and Signature, For Service needs:Please contact our A. O. SmithCustomer Care No. Lowes Item #: 1055575, Model: GT15-240-NI Needless to say, I try my best to produce contents to help my readers. Any damages to water heater occuring due to site conditions like electrical works and plumbing works. Manage Settings Lorem ipsum dolor sit amet, consectetur adipiscing elit. For this freeze protection system to operate, there has to be electrical power to the unit. Smith GAS WATER HEATER User Manual, Page 17: Wire Diagrams 305E/O, 305I, 505E/O, 505I, Page 20: Component Replacement Instructions. This chapter will show you how to adjust temperature on AO Smith Gas water heater, no matter if you have a tank or tankless unit. Thanks for your feedback. Failure to observe this warning could result in severe personal injury or death. Legal Disclosure:Lildutchuncle.com provides and shares information on plumbing, heating & air quality, home improvement, and other DIY projects. Continue with Recommended Cookies. 3. Cut out the inlet for the remote controller cable from the bottom of the main body. (Fig. The content is not intended to be a substitute for professional advice or consultation. The Company announced Q1 sales of $966 million and net earnings of $126.9 million or $.84 per share. This appliance does not have a pilot. The fan motor is still spinning after operation has stopped. The Power indicator lamp glows.Temperature settingTurn the Temperature control knob clockwise for the device to commence heating and change the set temperature. Smith GDV Instruction Manual, Water Heater A.O. Smith line of water heaters is a broad one, covering both residential and commercial use and electric and gas options. In some cases, the heater wont be able to do this. These flow rate requirements must be followed. No, its not too low. Improper installation can cause nausea or asphyxiation, severe injury or death from carbon monoxide and flue gases poisoning. Turn the manual gas valve located on the outside of the unit to the off position. Installation Manual Installation WARNING FOR INSTALLATIONS FOR YOUR SAFETY, READ BEFORE INSTALLATION: WARNING NOTICE Do not install the water heater and its termination where water, debris or flammable vapors may get into the water heater and flue terminal.