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Hello! Thank you for your inquiry about the Takagi TK-540X3-NIH water heater. Since you're in a salon, some chemicals or dry cleaners that are used there may affect the flame sensor and may cause the water heater to not work properly. In such a case, direct venting of the water heater is recommended. We hope this information helps. Thank you for choosing PlumbersStock to help you with your concern. We are always happy to assist you. Have a nice day!

Hello! Thank you for your inquiry about the Takagi TK-540X3-NIH water heater. To calculate the minimum size of the vent openings, you solve for the cross-sectional area by dividing the percentage of the free area of covering into the minimum free area required. In your case, since you're using a metal grill, your free area percentage would be 75%. We hope this information helps. For more information, you may refer to page 19 of the product manual. Thank you for choosing PlumbersStock to help you with your concern. We are always happy to assist you. Have a nice day!

Hi there! Thank you for your inquiry about the Takagi TK-540X3-NIH tankless water heater. The vent installation must comply with the ANSI Z223.1 or the NFPA 54 (National Fuel Gas Code), or the local codes in your area. You can check page 14 of the product manual for your reference. Thank you for choosing PlumbersStock. Have a great day!

Hi there! Thank you for your inquiry about the Takagi TK-540X3-NIH tankless water heater. Here are the general rules for venting water heaters: (1) Place the water heater close to the vent termination, securely fasten the vent collar to an unobstructed vent pipe, and avoid welding or altering the vent collar. (2) The vent should be easily removable for maintenance. (3) Only connect the water heater vent to an approved common-venting system, avoiding connections to other gas appliances. (4) Use appropriate materials for air supply pipes and avoid prohibited materials for non-metallic venting. (5) Sidewall or vertical venting is recommended, and slope horizontal venting sections appropriately. (6) Run the exhaust vent and intake pipe parallel when possible. (7) Install a rain cap for rooftop venting and avoid venting into a chimney. (8) Do not connect the water heater to a chimney flue serving a solid fuel-burning appliance. (9) When replacing a Category I appliance, resize the venting system if necessary. You can check page 13 of the product manual for more details. Thank you for choosing PlumbersStock.Have a great day!