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Hot water tanks are the lifeline of your house. Day to day living would be pretty unpleasant if you couldn’t wash your hands and dishes with hot water. And don’t even think about having to take an ice cold shower every day. It would definitely wake you up, but wouldn’t be a whole lot of fun.

The two main kinds of hot water tanks are regular and tankless.

Tankless water heaters take up very little space. They use quite a bit less energy, so you can save up to $100 a year on your bill. Tankless models heat water on demand when you turn on the faucet. The main advantage of tankless is you don’t have to keep 40 to 50 gallons of water hot in a storage tank, which is a lot more efficient.