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Rheem Professional Classic Tall Atmospheric Natural Gas Water Heater, 40 gal, 38,000 Btuh

Rheem Professional Classic Tall Atmospheric Natural Gas Water Heater, 40 gal, 38,000 Btuh

Best price now

$1,003.74at AmazonChecked 13 h ago

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Price facts

  • Lowest price today: $1,003.74 at Amazon (checked Nov 14, 2026).
  • Our take on the Rheem Professional Classic Tall Atmospheric Natural Gas Water Heater, 40 gal, 38,000 Btuh

    The Rheem Professional Classic is a tall, atmospheric natural gas water heater with a 40-gallon tank and a 38,000 Btuh burner. Its first-hour rating of 51 to 86 gallons and 30 to 40 GPH recovery at a 90°F rise suit households of two to four people with normal hot-water habits. It meets 10 ng/J NOx limits, so it fits many air-quality districts. Against power-vent and condensing rivals it is simpler and cheaper to install, but its 0.63 UEF is well below condensing units, and the 6-year tank warranty is shorter than the 10 to 12 years some competitors offer.

    Best forTwo- to four-person householdsReplacing an existing atmospheric gas heaterHomes in NOx-restricted air districtsBuyers who want a simple tank with no power vent
    Pros
    • 38,000 Btuh burner recovers 30 to 40 GPH at a 90°F rise
    • First-hour rating of 51 to 86 gallons covers back-to-back showers
    • Atmospheric venting needs no blower or extra electrical work
    • Meets 10 ng/J NOx requirements
    • Tall 61.75-inch profile fits tight closet installs
    Cons
    • 0.63 UEF is low next to condensing and heat-pump heaters
    • 6-year warranty is shorter than many rivals' 10 to 12 years
    • Needs a proper metal flue and combustion air supply
    • Standby loss is higher than on power-vent models

    Rheem Professional Classic Tall Atmospheric Natural Gas Water Heater, 40 gal, 38,000 Btuh prices at every store

    • AmazonNew

      Availability unknown

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      $1,003.74Free shippingChecked 13 h ago
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    Rheem Professional Classic Tall Atmospheric Natural Gas Water Heater, 40 gal, 38,000 Btuh price history

    Lowest price we've seen: $1,003.74 on Nov 14 at Amazon. Tracked across 1 store since Nov 14.

    About the Rheem Professional Classic Tall Atmospheric Natural Gas Water Heater, 40 gal, 38,000 Btuh

    This is a tall, atmospheric natural gas water heater from Rheem's Professional Classic line.

    It has a first hour rating of 51 to 86 gallons and a recovery rate of 30 to 40 GPH at a 90° F rise. Its UEF is 0.63. It meets 10 ng/J NOx requirements.

    Fuel type
    Natural gas
    Type
    Tall, atmospheric
    Height
    61.75 in
    UEF
    0.63
    First hour rating
    51 to 86 gallons
    Recovery rate
    30 to 40 GPH at a 90° F rise
    NOx emissions
    Meets 10 ng/J NOx requirements
    Warranty
    6 years

    Specifications

    Tank capacity
    48Source
    Fuel type
    Natural GasSource
    Height
    61.75"Source
    Warranty years
    6Source
    First hour rating
    51 - 86 gallonsSource
    Recovery rate
    30 to 40 GPH at a 90° F riseSource
    NOx emissions
    Meets 10 ng/J NOx requirementsSource

    Questions and answers

    How many people does a 40-gallon unit with this first-hour rating serve?
    The 51 to 86 gallon first-hour rating fits two to four people with normal shower and laundry habits. Larger households or heavy simultaneous use may want a bigger tank or higher recovery.
    Does it need electricity to run?
    No. It is atmospheric and uses a standing pilot, so it needs no blower or wall outlet. It does need a vent flue and combustion air.
    How does it compare with a condensing heater?
    A condensing unit is more efficient and can vent through PVC, but it costs more and produces condensate. This Rheem is simpler and cheaper to install but uses more gas.
    What is the recovery rate?
    About 30 to 40 GPH at a 90°F temperature rise, so it reheats a full tank in roughly an hour to an hour and a half.
    What is the warranty?
    Six years on the tank. That is shorter than the 10 to 12 years some competing models carry, so weigh it against expected service life.
    Can it be installed in a garage or closet?
    The tall 61.75-inch body fits many closets, but atmospheric units need proper venting and combustion air. Check local code and clearance before installing.
    Where is the Rheem Professional Classic Tall Atmospheric Natural Gas Water Heater, 40 gal, 38,000 Btuh cheapest?
    At Amazon, for $1,003.74, as of our latest check.

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