Check the manufacturers specs or gas code book. TSSA B149.1 installation of natural gas and propane appliances if you are in Ontario Canada.
No. Gas water heaters are not all designed to use direct venting.
24"
No, propane gas heaters are designed to operate on propane gas, while natural gas heaters are designed to operate on natural gas. They require different gas pressures and safety mechanisms specific to each gas type. Using a propane gas heater with natural gas can be dangerous and may damage the heater.
Natural gas space heaters can be bought from numerous stores and retailers online. They are available to purchase from The Home Depot, Lowe's, eBay and Amazon.
Natural gas is more thin than air, which means it is not as flammable and will more likely go up in the atmosphere. Although it is non-toxic, one should still make way for ventilation avoiding suffocation. Natural gas is clean and efficient. It is surely one of the safer options to bare in mind.
Gas heaters are much more efficient. Electric resistance heaters are, by nature, hideously inefficient.
Gas tankless water heaters require proper venting to safely remove combustion gases from the unit. Venting requirements typically include using a dedicated vent pipe that is properly sized and installed according to the manufacturer's guidelines. It is important to ensure that the venting system is designed to prevent backdrafting and allows for proper airflow to maintain efficient and safe operation of the water heater.
18 inches above the garage slab
Gas water heaters are better than electric water heaters. Although they are not exactly or completely environmentally healthy, they do save you a lot more money and heat up much better.
Vented natural gas heaters for homes provide efficient heating, better indoor air quality, and increased safety compared to unvented heaters. They also help reduce moisture buildup and the risk of carbon monoxide poisoning.
Tankless water heaters can be powered by electricity or propane. Electric tankless water heaters are more common, but propane tankless water heaters are popular in regions where natural gas is not available. Both types offer energy efficiency and the convenience of on-demand hot water.
Many people already have gas stoves, and gas water heaters, which burn natural gas. The general public has had access to natural gas for a very long time, at least a century.