Are you talking about a on demand system? If so, they are, it won't give you very hot water fast, but it'll get there, the difference is that it doesn't have to keep like 40 gal of water at 120 degrees, so it only runs when you need it. They also make a natural gas, and LP system that will give you hot water almost as soon as you turn on the faucet.

Filed under: Electric Tankless Water Heaters

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