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    amb0827's Avatar
    amb0827 Posts: 1, Reputation: 1
    New Member

    Mar 15, 2008, 05:15 PM
    Changing from 100 amps to 200 amps
    I have a gas water heater (40 gallon tank). I want to change it to an electric tankless water heater. I have read that I need 200 amps in the house to do this, but currently I have only 100 amps. The outside meter is located only about 25 feet away, but the lines are underground. What is involved with upgrading to 200 amps, what would be a ballpark cost for an electrician to do this, and does being underground really increase the costs to upgrade? I really dislike gas and this is the reason I would like to change to all electric. Thank you.
    stanfortyman's Avatar
    stanfortyman Posts: 5,598, Reputation: 279
    Electrical & Lighting Expert

    Mar 15, 2008, 07:34 PM
    Then why no just install a regular tank type electric heater?

    These tankless heaters are NOT all they are hyped up to be.

    YES, underground make a service replacement much more expensive. Although 25' is not that much.
    A typical upgrade is in the $1800-$3500 range depending on your location, with the high end in the California and west coast areas. ADD to that the extra cost for the underground portion.

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