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4.0 Gal. 6-Year 1500-Watt 120-Volt Point-of-Use Mini Electric Water Heater

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  • Easy under-sink installation puts water right where you need it
  • Lightweight, compact design is easy to handle and install
  • Same-day installation in most areas. Call 1-855-400-2552 by noon.
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Product Overview

The Ariston/Bosch 4 Gal. Electric Water Heater has a 4 Gal. mini tank that fits under your sink to provide hot water right where you need it. The heater plugs right into a 120-Volt outlet and has a lightweight, compact design that's easy to handle and install. A glass-lined tank offers great insulation, while the heater's fast recovery rate eliminates long waits for hot water. A temperature-and-pressure relief valve enhances your safety.

Info & Guides

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Product Depth (in.)
13.5 in
Product Height (in.)
13.75 in
Product Width (in.)
13.75 in
Tank Valve Size (in.)
0.5 in
Water Connection Size (in.)
1/2 in


Amperage (amps)
12.5 A
Efficiency Level
Finish Family
Fuel Type
Maximum Temperature (F)
145 °F
Minimum Temperature (F)
65 °F
Pack Size
Product Weight (lb.)
17 lb
Rated Tank Capacity (gallons)
4 gal
Required Volt Connection
120 volt
Tank Lining Material
Tank Warranty
1 Year
Uniform Energy Factor
Water Connection Location
Water Heater Features
Overheat Protection,Temperature Pressure Relief Valve
Water Heater Profile
Wattage (watts)
1500 W

Warranty / Certifications

Certifications and Listings
CSA Listed,UL Listed
Labor Warranty
No Warranty
Part Warranty
1 Year

Questions & Answers

Typical questions asked about products:

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Customer Reviews

  • 3.6
    out of 62 reviews
  • 71% recommend this product
Filter by:
Showing 1-10 of 62 reviews
easy to install and seems to be working great
this product was easy to install I couldn't hide it but it still looks good it seems to be working great if you need hot water somewhere I recommend this product it's been a few weeks and is doing the job I needed it to do
  • DIY
  • Recommended
4 people found this helpful
This is a replacement.
It was easy to install because I was replacing one that failed. It was 4 1/2 years old. I hope this one last longer.
  • Pro
  • Verified Purchase
3 people found this helpful
Great Little Water Heater
Installed under the counter for the source of an instant hot water tap. Used quick-connect fittings so removing the lines to drain it & change the element when necessary will be quite simple (it has no drain valve). Will install one in a bathroom remodel that's at the other end of the house from the water heater so no waiting for a hot shower.
  • DIY
  • Verified Purchase
  • Recommended
7 people found this helpful
Good value, reliable, long life
Very easy to install - took longer to clear space under kitchen sink than to install heater. After some experimenting, we set heat a little hotter than the "ideal" marking. Gives very hot water almost instantly, and plenty for doing large pile of dishes. Also serves dishwasher. We seem to always turn water to hot when at the sink and have not been disappointed. The best we can remember, we have had this unit under our sink for around 10 years. In that time, we have not had a single problem with it and have not done any maintenance. This morning water was not hot, so turned control switch off then back on. Worked great all day, had to turn switch again in evening. Don't know if this is permanent or not, but after reading other reviews I think we have done well with this unit. Will definitely get another if this one stops. May put this one under sink in garage.
    • Recommended
    This was my second Ariston (Bosch) point of use water heater. Works great while they work. Both...
    This was my second Ariston (Bosch) point of use water heater. Works great while they work. Both started leaking after 2 years. The warranty dictates that you change something inside the heater every year to maintain the warranty. I will find another brand next time.
      1 person found this helpful
      Loved it for 6 1/2 years
      After 6 1/2 years it stopped working but I sure loved it every day! Plenty of really hot water flow, fast recovery, totally reliable and never a problem until one day after 6 1/2 years it died :(. Will get a new one!
        • Recommended
        Review Update August 2014 to May 2016
        I've now had 2 units for almost 2 years and I have never had any issue with them at all. For better or worse, I haven't looked into maintenance at all (which of course I don't recommend), but each still provides hot hot water, one at the kitchen sink and dishwasher, and the second under the bathroom sink.
        • DIY
        • Recommended
        The first one had a six year warranty. I have just requested the fourth (4th) water heater, since the first three failed during the last five years. At $200 per removal and installation, the cost is excessive. Very unreliable.
          1 person found this helpful
          Nearly useless
          It heats a VERY small amount of water to wash a few dishes then it turns cold. One would assume that I could actually get 4 gallons of hot water but it mixes with the incoming cold and it becomes lukewarm quite quickly. If you are using water that comes from a well and it's cold this will take forever to get it hot. I regret that I threw away the box as I would have surely returned it.
          • DIY
          Does not last long
          This unit heats fast and provides a good amount of water for light jobs. We bought it to replace a tankless natural gas water heater that failed due to cold air coming down the flu pipe causing the tankless heater to freeze and rupture. We thought that having a small electric unit like this would be more reliable but still sufficient for our sink water and dishwasher. It works fine for that and we rarely run out of hot water. We also love the instant hot water since it could not be any closer to the faucet. However after 4 years we've had to replace this Ariston unit twice due to leaking tanks ( we're on number 3 now) so it is NOT hassle free. Not sure on what planet will the tank last 6 years per the warranty. I've had water damage twice now due flooding. Although not called for in the instructions, this time I've placed the unit in a water heater pan with a drain!
          • DIY
          • Recommended
          Showing 1-10 of 62 reviews