When creating a size plan on what tankless water heater to install in your house, you must figure out certain things. Such things include but not limited to the number of bathrooms you have in place, the energy source, the temperature of the input water, the diameter of the gas line, available voltage, and the design of your interior. You want to buy a high-quality water heater that will fit well in your existing water line as well as work perfectly well with the available electricity voltage. Tankless water heater models differ when it comes to what they can do and the amount of water they can heat at different flow rates. And that’s the reason you should also consider checking the number of bathrooms and other faucets that will use the hot water. Ask for professional assistance so that you don’t settle for a tankless water heater only for it not to match your application requirements.