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Rheem 'RTE 18' 5 GPM Electric Tankless Water Heater

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ITEM# 15580087
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ITEM#: 15580087

This electric tankless water heater from Rheem is just right for bathroom renovations or additions. Its compact design fits almost anywhere and provides continuous hot water on demand.

Click here to view additional information about this item

  • Type: Electric, tankless
  • Brand: Rheem
  • Model: RTE 18
  • Volts: 240 volts - 18KW
  • UL listed: Yes
  • Materials: Metal, plastic
  • Standard 0.5-inch water connection
  • Rugged brass/copper heat exchange
  • Industry leading low-flow activation
  • Modulating power
  • Maximum flow rate: 5.0 GPM
  • Dimensions: 10.5 inches long x 11.25 inches wide x 7 inches high
  • Energy saver: Yes
  • No assembly required
  • Display: LEDs indicate active element and standby mode
  • Settings: External on-unit temperature control


Material Metal, Plastic
Fuel Type Electric
Product Features Energy Star Compliant, UL Listed, Variable Temperature Control
Wattage 7000 Watts or More
Dimensions See Details
Warranty 10 year Limited Manufacturer
Model Number RTE 18
Country of Origin United States

Quality Rating

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Features for Rugs

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Product Reviews

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1 Stars
  • Most Recent

  • What a piece of junk.
    Verified Purchase

    Comes with NO attachments, poor directions, spent a fortune on complex fittings, does not work as it is suppose to, will now cost more to return it than it is worth, what a piece of junk, going with a small tank water heater and this is going to scrap heap.

    Read More
    sccarnut Mar 30, 2014

Questions & Answers

  • Q:

    "must I use copper tubing in/out of water heater"

    • A:

      Thank you for contacting us 1kaz. You can use either copper or PVC, unless the temperatures you are reaching are above 180 degrees. In that case you would want to use the copper supplies. Please let us know if you have any further questions.

  • Q:

    "What size unit should I use for a 1 bathroom Studio apt with a maximum of 2 people."

    • A:

      Thank you for your inquiry; you will be contacted by Customer Care.

  • Q:

    "does this item come with all the necessary attachments? How do I know what size to get for my square footage? I have 1800 sq. foot."

    • A:

      Hi, coolsesh1234. This water heater does come with a mounting kit. The right size for you would depend on the amount of water you use in your home rather than the square footage of your home. This product has a maximum flow rate of 5 GPM. Please let us know if you have any further questions. Thank you for your interest.

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Shipping & Returns

Contact Information
Shipping Information:

Our standard shipping method is ground shipping. We also offer expedited shipping for most items. Your final shipping cost and estimated delivery timeframe will be available at checkout.
Standard shipping details
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Standard Return Policy:

Items must be returned in new or unused condition and contain all original materials included with the shipment. More Details

FINAL SALE EXCLUSION: Items marked as FINAL SALE are not returnable unless the problem you experience is the result of our error.

For your protection, all orders are screened for security purposes. If your order is selected for review, our Loss Prevention Team may contact you by phone or email. There may be a two business day delay to process your order.

** Most Oversize orders are delivered within 1-4 weeks. Some orders may take 6 weeks to be delivered.