Buy a Tankless Water Heater: What You Need to Know Tankless water heaters are a great option for homeowners who are looking for a more efficient and convenient way to heat water. They provide hot water on demand, so you don't have to worry about running out. Tankless water heaters can also save you money on your energy bills. If you're considering buying a tankless water heater, there are a few things you need to know. ...