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Bosch GL4S Ariston 4-Gallon Point-of-Use Indoor Electric Mini-Tank Water Heater

by Bosch
4.3 out of 5 stars 255 customer reviews
| 54 answered questions

List Price: $197.00
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  • Point-of-use 4-gallon mini-tank water heater
  • Provides instant hot water for your sink's faucet
  • No hard wiring needed, simply plug into an outlet; installs independently or with a larger water-heating source
  • 120 volts, 1500 watts
  • Measures 14-by-14-by-12-1/4 inches; weighs 17 pounds; 1-year limited parts warranty, 6-year limited heat exchanger warranty
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20 new from $149.00 2 used from $134.95

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  • Bosch GL4S Ariston 4-Gallon Point-of-Use Indoor Electric Mini-Tank Water Heater
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Product Description

Product Description

Bosch Ariston GL4S (Ariston GL4) Electric Mini-Tank Water Heater - Installing an Ariston electric mini-tank water heater under the sink puts hot water right where you need it -- at the point of use. Easy installation. Simply tap into the cold water line and install the water heater directly at the sink. Plugs directly into a standard 120 volt outlet. And when you want to eliminate the wait for hot water but need more volume, install the Ariston water heater in-line with a larger hot water source. The Bosch Ariston GL4S (Ariston GL4) keeps 4 gallons of hot water ready to go and draws only 12.5AMPS. A Pressure relief valve is included. The Bosch Ariston GL4S is a replacement for the Ariston GL4, but please note that the GL4S is 13.5" deep while the Ariston GL4 was only 12.25" deep.

The new Ariston GL4S has many new improvements over the older Ariston GL4. The Ariston GL4 has a new temperature adjustment knob on the front of the unit to raise and lower the temperature from 65 Deg F to 145 Deg F while on the older Ariston GL4 you would have had to remove the blue oval cover to access the temperature control knob.

The Ariston GL4S also has a new improved thermostat that features a new sensing probe that is attached to the thermostat and inserts into the cavity of the new element so the heater can adjust temperatures quicker and maintain a more consistent heat.


The Ariston 4-gallon point-of-use electric mini-tank water heater eliminates the wait time for hot water to come from the sink faucet. You can install the heater independently or in-line with a larger water-heating source. You need no hard wiring to power your unit; simply plug it into any standard outlet and this heater's ready to go. The glass-lined tank ensures long life, and the superior insulation provides quick recovery and greater energy efficiency. This 120-volt, 1500-watt water heater weighs 17 pounds and measures 14-by-14 by-12-1/4 inches. Ariston backs its heater with a manufacturer's 6-year limited warranty for the heat exchanger and a 1-year limited warranty for parts.

Product Information

Technical Details

Part Number GL4
Item Weight 23.1 pounds
Product Dimensions 12.2 x 14 x 14 inches
Item model number GL4S
Size 1
Voltage 120 volts
Item Package Quantity 1
Batteries Included? No
Batteries Required? No
Warranty Description 6-year warranty, 1 year on parts

Technical Specification

Additional Information

Customer Reviews
4.3 out of 5 stars 255 customer reviews

4.3 out of 5 stars
Best Sellers Rank #7,826 in Home Improvements (See top 100)
#12 in Home Improvement > Rough Plumbing > Water Heaters & Parts > Water Heaters
#718 in Home Improvement > Contractor Supply
Shipping Weight 23.1 pounds (View shipping rates and policies)
Domestic Shipping This item is also available for shipping to select countries outside the U.S.
International Shipping This item is not eligible for international shipping. Learn More
Date First Available January 1, 2008

Warranty & Support

Product Warranty: For warranty information about this product, please click here

Customer Reviews

Top Customer Reviews

Verified Purchase
This mini-tank water heater works very well and we love not having to wait for hot water at the kitchen sink. The form-factor is also very convenient for mounting under the kitchen sink, unlike some other small point-of-use water heaters.

I have this hooked up inline with a gas tankless water heater and I wanted to know how much this new heater was costing me in electricity, so I hooked up a meter to check it out for a few weeks. It turns out that, with our normal usage, it uses just about 5 KWH/week - which works out to about $2/month in our area.

Before this heater, we had to run a full 2 gallons of water down the drain before getting hot water to the sink - which was both a big pain and somewhat wasteful. With this 4 gallon heater, we basically have an instant and endless supply of hot water at the sink since the hot water from the main tankless unit arrives before the water cools too noticeably. I've also noticed that it seems to heat water on it's own very quickly.

The biggest problem with this water heater is how much of a pain it is to set the thermostat. You basically have to remove 3 panels and then turn a dial that isn't labeled at all. In order to get it set to the same temperature as my main water heater, I ended up using an instant-read thermometer and moving the thermostat dial as I filled the tank with cold water and let it reheat it to the set temp. The process took a while, but I shouldn't have to do that again.

Overall, I'm very pleased with the purchase and would recommend this water heater.

Edit: It is now February, 2010 and this water heater has been installed for almost 2 years. It is still working perfectly and I haven't had to mess with it at all since the initial installation.
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I have 2 tankless water heaters in my house (one on each end of the house). I added a 6 gallon tank to one of them to see if it would allow me to get hot water faster while the tankless water heater starts to heat up. I purchased an A.O.Smith for this and it worked great. For 4 years it has plugged away and I've never thought about it for a second. I've never had to touch it even one time so it's covered in dust and spider webs. I love it.

Two years later, I asked the plumber to put the exact same water tank into my house on the other tankless water heater. Instead, he installed this one by Ariston (Bosch). After I saw what he did, I told him this wasn't the same brand, but he assured me that this was far better. It was *NOT* better.

From the very beginning, the thermostat circuit kept triggering and shutting off because it said the water was too hot. Even when I turned it down to a very low temperature, it kept triggering. I would have to run down the basement and reset the tank. After many months of this and calls to the plumber, he told me to call their customer service line. Ariston (owned by Bosch) sent me a new thermostat and told me to install it. I installed it with some difficulty because the instructions on how to do this were terribile.

It fixed the problem for about 6 months, then it started triggering again. At first occasionally. Now it triggers every day. I get lots of exercise running the stairs. I assure you that I'm monkeying with this thing so much that it doesn't have any dust or spider webs on it. It's squeaky clean.

I called tech support and asked for a new thermostat again. They told me that my warranty expired and I was on my own. The guy on the phone, Scott, was rude and condescending.
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Verified Purchase
If your living in a place like mine where your hot water heater is a long way from the kitchen sink, then you are probably going crazy like I was waiting and waiting for the hot water to finally get to the faucet. There are technical ways to remedy this, but they involve a lot of plumbing, auxiliary pumps, and ripping half your house apart. Since I rent, I was thinking that the landlord wouldn't take to kindly to this idea. So I started casting about for a better solution.

That's when I came up with the idea of putting a little water heater as close to the kitchen faucet as possible. With this, the hot water is right there where you need it. No waiting and wasting a lot of water while running the faucet so that a half mile of plumbing warms up.

'Only problem is a tiny tank has very limited capacity. If you're only washing a dish or two like me, then no problem. But if you wash a sink full of dishes, it will quickly run out.

But the trick is to hook this little heater right in line with the hot water supplied from the big tank. As you draw hot water, cold water will go into the small heater, but only for a gallon or two. Then as you continue to draw hot water, the small heater now has hot water being supplied to it, so the hot water just keeps on coming.

I checked around with local suppliers and found small hot water heaters, but most were kinda short and stubby and wouldn't fit under the sink well at all. But I stumbled upon this neat deal from Ariston. It's a nice clean design, well insulated, and fits under the sink extremely well. I also felt that the price was very reasonable considering how nice it is. The funny thing is, it seems to be specifically designed for exactly the idea I had in mind. It was a snap to install.
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