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Answered 2011-08-30 16:10:38

Tankless water heaters are more efficient than conventional water heaters because they only use energy when hot water is needed. Conventional water heaters use energy to keep the tank hot all the time. Another advantage, particularly in a large house, is that you don't have to run as much water before the hot water reaches the faucet.

However, tankless water heaters are expensive to purchase and expensive to install. In some houses, you may need more than one. The energy savings may not be enough to pay for the additional cost over the lifetime of the water heater.

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