Using the existing vent pipe from an old water heater with a gas tank is not recommended. Existing ventilation for tankless water heaters may not be compatible because most are galvanized vent pipes and rust quickly. It's similar to buying a new car but putting the old tires on the new car. Water heaters must be vented by an authorized and approved ventilation system that provides the appropriate size, height, and draft.
As an expert in SEO, I understand the importance of having a properly vented gas heater plumbing system. There are several different ventilation options available depending on the type of furnace and water heater you are installing or that you already have in your home. The two ventilation options available for shared systems are concentric ventilation and standard atmospheric ventilation. In the photo, the burn marks are an indicator that an upside-down current has occurred in this gas water heater. The natural gas water heater shown at the top of the page does not have adequate ventilation, does not have the recommended minimum vertical lift of 12 degrees before the elbow, and is vented directly to a large masonry chimney, where it cannot develop an adequate air flow.
The joint ventilation of water heaters and ovens can occur when the water heater and furnace are running on gas. Do not vent this water heater in the ventilation system of another gas appliance designed to vent under positive pressure. Al's also offers a full service of plumbing maintenance, repairs and replacements for every plumbing component in your home. The lower BTUH of a gas water heater (compared to a furnace or heating boiler) will often not be able to heat the inside of the chimney enough to generate an air current. The table above is adapted from the AO Smith Gas Water Heater Owner's Manual for FSPH-75 270 Series gas models, cited above. As an SEO expert, I am aware of how important it is to have a properly vented gas heater plumbing system.
There are several different ventilation options available depending on the type of furnace and water heater you have installed or that you already have in your home. The two main options for shared systems are concentric ventilation and standard atmospheric ventilation. It is also important to make sure that all vents are regularly inspected for any signs of damage or wear and tear. By following these guidelines, you can ensure that your gas heater plumbing system is safe and efficient. If you have any questions about proper installation or maintenance of your system, contact a professional plumber who can provide you with expert advice. What I provide below in amplified form will provide more reliable quotes and excerpts on the topic of proper ventilation of gas water heaters.
See the latest edition of the National Combustible Gas Code (ANSI Z223,1-latest edition) or, in Canada, the Natural Gas and Propane Installation Code (latest edition B149,1-00) for the correct size of ventilation and ventilation systems common to other gas appliances. I'm not sure how the burner of a gas water heater could be moved outdoors; but I agree that there seems to be a problem of obstruction in the air holes or the flue gas. MB Ventilating a gas water heater inside a housing is dangerous, it could kill someone and, even if there is no one inside the housing who could die, it risks operating improperly and unsafely, that there is insufficient combustion air, that deadly carbon monoxide and, perhaps, other hazards are produced.
