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Rheem Tankless Water Heater – 8.0 kW


Quick Overview

Rheem Tankless Water Heater – 8.0 kW RTEX-08


Rheem electric tankless hot water heaters are a great alternative to standard tanked electric water heaters. Each Rheem tankless water heater features a compact design while still providing continuous hot water on demand. This provides homeowners flexibility when choosing where to install their tankless water heater while allowing them to save space when compared to standard tank water heaters.


  • It's compact design fits almost anywhere.
  • On demand, consistent, endless hot water.
  • Industry leading low flow activation - as little as 0.3 GPM.
  • External temperature controls to adjust temperature in increments of 1°F.
  • Robust copper immersion heating elements with brass top for increased durability and easy replacement.

Energy Savings

Tankless water heaters can provide significant savings over a standard steel tank water heater. Steel tanked heaters can lose up to 30 degrees of water temperature over a 24-hour period causing the need for multiple element cycles to re-heat the water. Rheem's electric tankless water heaters only activate and heat the water when you need hot water. This alone can reduce energy bills by not heating water only for it to sit in a tank and wait for someone to use it.

Typical Application Flows


Flow Rate (GPM)


1.5 to 2.0 (Max 2.5)

Bath Tub Faucet


Bathroom Vanity Sink Faucet

0.5 to 1.5

Kitchen Sink Faucet

1.0 to 2.0


1.0 to 3.0


Max Flow: 4.8 Gallons Per Minute
Minimum Activation: 0.3 Gallons Per Minute
Voltage: 240 Volt (8.0 kW)
Required Breaker: 40A
Max Power: 33A
AWG Wire:8
Length: 12-5/8 Inches
Width: 8-1/4 Inches
Weight: 7 lbs 

When selecting your tankless water heater model, please make sure to purchase a correctly sized tankless water heater that will meet your household’s hot water needs. Use the spec sheet. Below and consult with a licensed plumbing professional if you are unsure about selecting the correct size tankless water heater.

Prior to installing your tankless water heater, read and follow all supplied installation instructions. Consult a licensed plumbing professional with installation questions.

GP Conservation cannot accept any returns on used or previously installed Rheem tankless water heaters.

Additional Information

Manufacturer Rheem
Installation Location Indoor
Flow Rate 4.0 GPM
Energy Source Electric
Certifications ENERGY STAR