Skip Content

Electric Tankless Water Heater,208VAC close
close x

Using 360° Viewing:

  1. Rotate: Use top-to-bottom, side-to-side by use of mouse arrow.
  2. Zoom In: Double click on image.
  3. Zoom Out/Reset: Put photo at full zoom & then double click.
How can we improve our Product Images?

Electric Tankless Water Heater, 208VAC

Price $283.00 / each

Please sign in or register to access lists

Confirm ZIP Code to determine availability.


Invalid Zip Code


Ship to: (Change)


Invalid Zip Code

  • Item # 21HT82
  • Mfr. Model # SP4208
  • UNSPSC # 40101826
  • Catalog Page # 3808
  • Shipping Weight 3.15 lbs.
Country of Origin USACountry of Origin is subject to change.
Note: Product availability is real-time updated and adjusted continuously. The product will be reserved for you when you complete your order. More

Technical Specs

  • ItemElectric Tankless Water Heater
  • Water Heater DesignPoint-of-Use
  • Water Heater ApplicationUndersink
  • Watts4100
  • Amps AC20
  • Voltage208VAC
  • Phase1
  • Min. Flow Activation0.30 gpm
  • Water Connection3/8" Compression
  • Temp. Rise @ 0.5 GPM56 Degrees F
  • Temp. Rise @ 1.5 GPM18.7 Degrees F
  • Temp. Rise @ 2.5 GPM11 Degrees F
  • Residential / CommercialCommercial
  • ElementsReplaceable Cartridge Insert
  • MountingVertical
  • Pressure Range25 to 150 psi
  • Wire Size12 AWG
  • Height10-3/4"
  • Width5-1/4"
  • Depth3"
  • FeaturesCold Water Feed Only, Cut Energy Costs - Flow Switch Activates Heater Only on Demand, 99% Energy Efficient, Compact Design - Fits Virtually Below Any Sink, on Demand Hot Water - Never Run Out, Compatible with Hands Free, Sensor, and Metering Faucets
  • StandardsUL 499 File E86887(M)
How can we improve our Technical Specifications?

Compliance and Restrictions

  • This product has been certified by a third party to be compliant with the “Safe Drinking Water Act” requirements for low lead in potable (human consumption - drinking and cooking) and non-potable water applications (non-human consumption).

  • This item has been restricted from sale in the following countries: Spain and France.

  • View the EnergyGuide Label for this item.

Alternate Products

Product Reviews Disclaimer:
Grainger is neither responsible for, nor does it endorse, the content of any product review or statement posted. Any statements posted constitute the statements of the poster and are not the statements of Grainger. The statements posted by Grainger employees with the Grainger employee badge represent the views of such employees and are not the statements of Grainger. Grainger makes no representations as to the appropriateness, accuracy, completeness, correctness, currentness, suitability, or validity of any product review or statements posted, including those posted by employees with the Grainger employee badge, and is not liable for any losses, injuries or damages which may result from any such product review or statements. Use of any linked web site provided in a product review or post is at the user's own risk.

Product Q&A

(1 Question : 1 Answer)

Ask your questions. Share your answers.

« Back
The water is coming out boiling hot, I installed a thermostatic mixing valve under the sink but in this chase the heater doesn't work due to water flow restriction in the valve, so I disconnected the mixing valve and I went back to the boiling hot water. The faucet on the sink is sensor type, no way to set water temperature from the faucet.
The question: is the water temperature adjustable, or not?
Exmax 208 V, 4100 W
5 months, 2 weeks ago
Read all my Q&A
Please wait while more information about Silviu is loaded.
Additional information about Silviu could not be loaded.
0out of 0found this question helpful.
Was this helpful?helpful0unhelpful0
1 Person needs an answerI have this question too


Increasing the water flow using the faucet, with experimentation you should notice an decrease in temperature that is how the temperature rise is adjusted by flow. Use cold water only on the inlet to the heater. Contact Eemax at 1-800-543-6163 if you need to change the little black bung on the heater this restricts flow though the heater to get a lower temperature rise.
3 months, 3 weeks ago
Read all my Q&A
Please wait while more information about JamesB is loaded.
Additional information about JamesB could not be loaded.
0out of 1found this answer helpful.
Was this helpful?helpful0unhelpful1
1 of 1
1 of 1