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Model#: ASTNGL4S

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Brand new items;Full manufacturer warranty available
Manufacturer inspected, repaired and tested items; CPO 60 day money back guarantee
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New or Recon items with possible minor cosmetic damage; CPO 60 day money back guarantee
Returned items inspected, repaired and tested by CPO technicians; CPO 60 day money back guarantee

Ariston GL4S Point-of-Use Electric Mini-Tank Water Heater

  • Ariston GL4S Point-of-Use Electric Mini-Tank Water Heater
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(continental U.S.)
This item is no longer available.
It has been replaced by the BWHN7738004997.

Product Overview

Additional Information


This small water heater is ideal for cottages, camps, and other specific applications where a small volume of hot water is desired. Its compact size means you save valuable floor space.
Check with your plumber or professional installer to ensure you have the requirements to install this product in your home. For additional help choosing the right water heater call one of our trained product specialists toll-free at 1-800-955-7661.
  • Glass-lined tank for longer life
  • 6-year warranty on tank - 1 year on parts
  • 2.5- and 4 gallon models plug into standard 110V outlet for easy installation
  • Temperature/pressure relief valve included
  • Meets ASHRAE 90.1 standard
  • Mounts on wall or floor
  • Three sizes to choose from
  • Elegant Italian design
  • This item may ship in the original manufacturer's packaging.
  • GL4 Point-of-Use Electric Mini-Tank Water Heater - GL4S


Length: 13.75 in.
Width: 13.75 in.
Height: 10.75 in.
Amperage: 12.5
Application: Two Sinks
Energy Factor: 0.94
Shipping Weight: 22.8 lbs.
Temperature Range: 65-145 Degrees F
Thermal Efficiency: 0.984
Voltage: 110/120V
Water Connection: 1/2 in. Male NPT
Wire Size: Plug-in



4.3 / 5.0
3 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
Would you recommend?
Yes (3)
Yes, I would recommend this to a friend
Nice item.
Nice compact water heater, good supplement for tankless 50' away on 2nd kitchen sink & dishwasher.
February 8, 2012
Yes, I would recommend this to a friend
Best point of use instant hot water solu
Works great! easy to install. just tap the cold line with a T and run a line to the cold input of the water heater. Then run a line from the hot output to the faucet's hot water line. Plug in and that's all.

The only thing is buying the correct fittings and lines to make it all work. Since most of the installs are for under sink, Bosch / Ariston should just include lines and fittings for standard faucet hook ups. I'd gladly pay more and save the trips to the hardware store to get it all figured out!
November 6, 2014
Yes, I would recommend this to a friend
Exactly what we needed!
This was exactly what we were looking for. We needed a small hot water heater for a water system in a concession trailer and this fit the bill perfectly. CPO had it in stock, at a great price, and shipped it next day. Easy as pie. Thanks!!
March 7, 2016

Questions & Answers

Start typing your question and we'll check if it was already asked and answered. Learn More
Browse 5 questions Browse 5 questions and 8 answers
Could we install in our 27' cherokee camper. Thx
Carol on May 17, 2016
BEST ANSWER: The Bosch GL4S has been discontinued and replaced with Bosch ES4. The new model plugs into a 120v. So long as your camper is wired for 120, it would work.
Could we install in our 27' cherokee camper. Thx
Carol on May 17, 2016
BEST ANSWER: Yes, but please scroll down the page and click on the manual icon to be sure it is compatible with your needs.
Can this be used for a single shower and sink?
Mike on Oct 12, 2012
BEST ANSWER: This product (the Point-of-Use Electric Mini-Tank Water Heater by Ariston) is suitable for use with a single sink. It does not provide enough hot water to be used with a shower & sink.
is it big enough to work for a single bathroom if you need to shower?
Kim on Sep 17, 2015
BEST ANSWER: No,the GL4S only heats 4 gallons of water at a time.A typical shower head uses 2 gallons per/min.
What is the rated water flow on this model?
jetjock on Oct 15, 2014
BEST ANSWER: The recovery rate is 7 gph at a 90 degree rise with a 3.85 gallon capacity


Ariston (Point of Use) Warranty 6 Year Warranty

This warranty applies to both new and factory-reconditioned Ariston (Point of Use) water heaters.


  1. The Inner Tank — If the inner tank leaks within six (6) years from the date of original installation of the water heater, because of a defect in material or workmanship, Bosch Water Heating will furnish to such Owner a new heater of the then prevailing comparable model.
  2. Any Component Other than The Inner Tank — If any other component part (other than the inner tank) proves to be defective in material or workmanship within one (1) year from the date of original installation of the water heater, Bosch Water Heating will furnish the Owner with a replacement of the defective part(s).
  3. Verification of Date of Original Installation — When Owner cannot verify or document the original date of installation, the warranty period begins on the date of manufacture marked on the tag affixed to the water heater.


  1. This Limited Warranty shall be the exclusive warranty made by the Manufacturer and is made in lieu of all other warranties, expressed or implied (whether written or oral), including, but not limited to, warranties of merchantability and fitness for a particular purpose.
  2. Manufacturer shall not be liable for any incidental, consequential, special or contingent damages or expenses arising, directly or indirectly, from any defect in the water heater or the use of the water heater.
  3. Manufacturer shall not be liable for any water damage arising, directly or indirectly, from any defect in the water heater component part(s) or from its use.
  4. Manufacturer shall not be liable under this warranty if:
    • The water heater or any of its component parts has been subject to misuse, alteration, neglect or accident, or
    • The water heater has not been installed in accordance with the applicable local plumbing and/or building code(s) and/or regulation(s), or
    • The water heater has not been installed in accordance with the printed manufacturer's instructions, or
    • The water heater is not continuously supplied with potable water.
  5. The Owner and not the Manufacturer or his representative shall be liable for and shall pay for all field charges for labor or other expenses incurred in the removal and/or repair of the product or any expense incurred by the Owner in order to repair the product. Some states do not allow the exclusion or limitation of incidental or consequential damages, so the above limitation or exclusion may not apply to you. This warranty gives you specific legal rights and you may also have other rights which may vary from state to state.


Note: A water heater should be installed in such a manner that if it should leak, the resulting flow of water will not cause damage to the area in which it is installed.

How the Owner can secure service or make a claim

  1. Owner should contact the dealer who sold the water heater covered by this warranty or
  2. Owner should submit the warranty claim directly to Bosch Water Heating at the address listed below, and they will arrange for the handling of the claim.
  3. Whenever any inquiry or service request is made, be sure to include the water heater model number, the date of manufacture, date of installation, Dealer's name, and the watts and voltage.
  4. When returning the water heater or component part(s), they must be individually tagged and identified with the Returned Goods Authorization # issued by Bosch Water Heating and shipped prepaid to Bosch Water Heating.

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