If you are replacing your storage tank water heater or are installing a new one in a new construction or commercial building, you may be considering a tankless water heater. These take up much less space for installation and are more efficient than storage water heaters. They also offer a constant supply of hot water, as long as they're sized correctly for your needs. The initial cost may be higher for purchase and installation, but in the long run a tankless unit should last much longer than a storage water heater and save much more in monthly water heating costs, since a tankless unit doesn't need to keep 40-50 gallons of water heated constantly.
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