Bosch Ariston GL4 Review – an unbiased summary

Image from Amazon

The Bosch Ariston GL4 is the slightly larger version of the GL2.5. So if that is what you are looking for…do read through my review to gain a better overview of this unit. 

In my review, I will summarise the pros and cons of this Bosch water heater, and provide a mode of comparison of prices for this unit provided by various suppliers.


Benefits Of Owning A Bosch Ariston GL4 water heater

Instantaneous hot water

This Bosch water heater can store up to 3.85 gallons of hot water supplying instantaneous hot water for a single sink faucet. The operating temperature range of this unit is 65 Degrees Fahrenheit to 145 Degrees Fahrenheit with a maximum water pressure of 150 psi.

Easy installation

No additional hard wiring is required to power your unit. The Bosch Ariston GL4 has a 1500-watt heating element and can be plugged into any 120V standard outlet.

Lightweight and functional aesthetics

The Bosch Arison GL4 has a small and compact design; Length (L) x Width (W) x Height (H) 12.25L x 14W x 14H Inches and weigh a total of 20 pounds. It is also small enough to be installed under your sink supplying your faucet with hot water.

Longer lifespan

The glass-lined tank of this Bosch water heater confers a longer lifespan for all of your Bosch Ariston series making it a worthwhile investment.

Better efficiency

The insulation of the tank for the Bosch Ariston GL4 also confers better efficiency of this heater with better insulation.

Versatility in deployment  

This unit can be deployed independently or as a part of a larger heating system. These series are also available in two other sizes; Bosch Ariston GL2.5 and Bosch Ariston GL6 allowing you a choice to decide which is best for you.

Customer Reviews on Bosch Ariston GL4

I have read many customer reviews for Bosch Ariston GL4 and have summarised them below.

The Pros 🙂

Positive comments are many and include its space-saving capability allowing it to be installed under the sink or kitchen cabinet, thus decreasing the distance of the water heater from your faucet and giving you almost instant hot water.

Others include ease of installation and convenient adjustment of temperature with no fear of scalding are also other positives that have been mentioned by consumers in terms of the positive aesthetics.

There were no sudden spikes in utility bills after installation of this unit so proving that having a tank water heater will necessary increase your energy usage. So ultimately you have to determine which heated water system is best for you.

The Cons 🙁

However there are also some negatives about the Bosch Ariston GL4 that I have to highlight. Like all tank water heaters, it will be good to have a drain pan below your unit to prevent any leakage.

The thermostat that comes with this unit is installed internally. To gain access to it for adjustment of temperature, you have to remove a cover plate and a few screws making it a possibly troublesome task especially if you need to do it often.

A dedicated 120V power outlet is also required for this unit; this heater requires 1500 watts, and it is not advisable to share that power point with your dishwasher, microwave or toaster to prevent any short circuit from happening in your household.

Other shortcomings include isolated cases of bad threading reported for fittings provided and bad customer service. However I am sure after the complaints Bosch will have ironed them out as there are no recent complaints pertaining to these issues.

Another point to consider is your regional water supply; if it is high in minerals, you might need to clean out your heating element more often. Like all tank water heaters, sacrificial anodes will also need to be replaced to prevent your tanks from rusting out. All these will probably add to your maintenance costs so it is important that your supplier covers these aspects in the warranty.

How does the Bosch Ariston GL4 rank on popular websites?


64 customers at Amazon gave Bosch Ariston GL4 an average of 4.0/5 stars. Out of 64 customers, 30 gave it a maximum of 5.0/5 stars.


56 customers at Nextag gave Bosch Ariston GL4 an average of 4.1/5 stars. Out of 56 customers, 27 gave it a maximum of 5.0/5 stars.

Home Depot

22 customers at Home Depot gave Bosch Ariston GL4 an average of 3.3/5 stars. Out of 22 customers, 7 gave it a maximum of 5.0/5 stars.

Warranty Information

There is a six-year limited warranty on the inner tank and a one year warranty on any heater component other than the inner tank.

Best Deals for Bosch GL4

As I was doing my research, I have discovered that the best place to purchase the Bosch Ariston GL4 is Amazon. There is stock readily available and at the lowest prices as compared to other sites.

Here is the link for you to check out this great product: Bosch Ariston GL4 Best Deals

(Download the specification sheet for Bosch Ariston GL4 here)


(Last updated 8th February 2012)

Wilson Yeo

I am the admin of Green Energy Helps and I possess a keen interest in how green energy and how leading a green lifestyle can help to reduce our individual carbon footprints. From my website, I will provide useful information about green energy and tips that allow you to leave the green way. Besides that, I will provide unbiased reviews about green products and whether they are suitable for you!

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