Ariston Water Heaters Review

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Ariston water heaters review features Bosch mini tank, point of use electric water heating units, designed for installation at the point of service for instant hot water delivery.


The great advantages of point of use Ariston hot water heaters are the elimination of a long pipe for hot water when the distant whole house heater is used, and significant reduction of heat and energy loss.


Where to install Ariston point of use water heater

Ariston water heaters are mainly built to supply one specific plumbing application, with an instant hot water delivery. The Ariston mini tank can be used in the home or office applications where the distant sink is far away from the main heater or boiler and takes too long to receive hot water. In a case where the remote sink is not served by the larger heater, an installation of the separate electric unit definitely makes sense.

The best location for Ariston hot water heaters is under the kitchen sink for dishwashing or in the bathroom for small jobs like shaving or face and hand washing. This is why this type is called under sink water heater.

They can be installed in line with the other unit, on a cold water line, directly at the sink and plug into 120 V supply. Such heater installation saves you valuable time, and above all, money.


Model Review

Ariston 2.5, 4 and 7.2

ariston water heaterBased on the size or your hot water needs, there are three electric, mini tank, Ariston hot water heaters, with capacities: 2.5, 4 and 7.2 gallons.

Ariston electric GL 2.5 mini tank heater has a capacity of 2.5 gallons and is ideal for single sinks. Glass-lined tank provides a longer life.

Bosch GL4 is the 4-gallon point-of-use model that supplies two sinks.

Bosch GL6 is the 6-gallon point-of-use mini-tank heater that actually stores 5.1 gallons for the vertical models, or 7.0 gallon for horizontal models, supplying two or more sinks.

Ariston hot water heater is lightweight and small, allowing the unit to be installed either on the wall or floor; and close to the faucet for a maximum efficiency. Bosch Ariston hot water heater models GL 2.5 and GL 4 has to be installed vertically, while model GL6+ can be installed either horizontally or vertically.

All three Ariston water heaters are using 1.5 kW heating element to heat water in a temperature range from 65 to 145 F (18-63 C). To keep that thermal energy inside the unit and therefore reducing the energy loss, models are equipped with polyurethane insulation.

Note: The temperature selector is behind the cover plate.

Another protection system added to the Ariston heater as a standard equipment, to prevent excessive water expansion, is called temperature and pressure relief valve. A drain pan is recommended for a potential leak.

emergency plumber

Ariston Pro

The Ariston Pro series is available in three sizes: GL8Ti, GL4Ti S / GL4CA S and smallest Gl2.5 S, all used for the point of use service. They are designed for under the sink installation inside the kitchen or bathroom cabinet. The compact and space saving design allows installation of these electric mini-tanks, close to the fixture to supply hot water instantly. With the water flow rate from 2.7 to 7 gallons they are used mainly for one fixture, while GL8Ti can be used for two.

They all use one heating element of 1440 Watts, which is fully immersed for 98% energy efficiency and recovery rate of 6.8 GPH max.

To protect from scalding or burns, thermostat is factory pre-set to the temperature between 105 and 113 F (41-45 C).

Note: To protect your electric Bosch water heater from failure, always fill up the tank first before turning the power on.

Price and warranty

Ariston mini tank has a 6-year warranty as the models built by other great manufacturers, AO Smith, Rhem/Ruud, Bradford White and State Industries.

You can buy Ariston water heaters by visiting one of many plumbing online stores; Amazon, Home Depot or through the certified Bosch dealer. The price is from $160 to $200 and it depends on the size. Buy from Amazon.

Review with pros and cons

Pros when buying Ariston hot water heater

  • Neat Italian design
  • Ariston water heaters are easy to install
  • Lightweight
  • Money saver
  • Works quickly providing an instant hot water
  • Good tech support
  • Some people used it in RVs
  • Fast recovery
  • Removable
  • Durable

Cons when buying Bosch Ariston
  • Inconvenient to control the temperature. Thermostat control is behind 2 covers, need a screwdriver to access.
  • Getting leaks from temperature-pressure relief valve thread.
  • Some consumers had to install an expansion tank to prevent water leaking from TPR valve.
  • Inaccurate controls.



(Pictures courtesy of Bosch)

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