Bosch Tronic Reviews

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Bosch Tronic electric water heaters are small and compact units, designed mainly for point-of-use service in residential and light commercial applications. Larger models can be used for whole-house water heating too.

Tronic is designed to supply hot water to distant fixtures in the kitchen, bathroom or offices and where it is not economical to run long pipes from the central water heating system. Point-of-use water heaters are also used in cottages, apartments, pool houses or as a supplement for other systems, such as solar, or installed in line for one fixture. These are also called under-the-sink water heaters.

Model review

Bosch electric water heaters can be found in several sizes and grouped in three categories; Tronic 5000, Tronic 3000 and Tronic 3000T.

Bosch Tronic 5000

Bosch Tronic 5000

Bosch Tronic 5000 is the most powerful group of all electric water heaters from this manufacturer. It consists of the three models WH36, WH27 and WH17, all designed for the whole-house water heating, providing enough hot water for one or more fixtures.

One of the greatest advantages is the small and compact size and thanks to its great flexibility these can be installed almost anywhere in the house.

Another advantage is the modulating power on some models, so depending on the hot water demand, the unit can use more or less power, for better comfort.

And when it compares to the tank-type units, Bosch Tronic also heats water with the high 97% efficiency, but this time heating is on demand, there is no storage tank and stand-by heat loss is minimal. Other quality features include the electronic flow sensor and the scale prevention technology, both working for the enhanced performance.

Bosch Tronic WH36, as the most powerful model can be used in homes with up to 2-3 baths in regions with the mild climate, or only 1 bath-home in colder areas.

All three Tronic models work in the voltage range from 208 to 240, providing a power from 17.25kW for WH17 to 36kW for WH36 model, and water flow rate from 2.6 GPM to 5.4 GPM.

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Bosch Tronic 3000

Bosch Tronic 3000

Bosch Tronic 3000 consists of the five models; US3, US6, US7, US9 and US12, and are usually called under-the-sink water heater as they are installed mainly in the bathroom or kitchen sink. With the smaller output and water flow, series 3000 is known as point-of-use group. Its efficiency is a little bit higher than on the previous models; 99% vs. 97%, while the flow rate is much lower; it goes from 0.5 for US3 model to 1.8 GPM for the US12 model. Most models require voltage from 208-240V while the model US3 120V.

Tronic 3000 models utilize tankless technology for on demand water heating. These are small and lightweight, equipped with the copper heat exchanger and heating elements, where only the model US12 features the thermostatic control. Another difference from the above whole-house models is that 3000 series allows installation horizontally or vertically.

Tronic 3000T

Tronic 3000T

The last category of the Bosch electric water heaters is the Tronic 3000T, a group that consists of the three models; ES 8, ES4 and ES2.5. As opposed to the above models, Tronic 3000T utilizes a small storage tank where hot water is always ready and delivered fast.

All the heaters have a compact and lightweight design, maximum size of 17x17x14” and weights close to 30 pounds, for easy installation either on the wall or mounted on the floor. Tronic 3000T uses one 1440 W heating element for easy hot water supply mainly to one fixture, while the largest model ES 8 can be used for 2 sinks at a time. Also, model ES8 is hardwired while ES4 and ES2.5 are plug-in type.

Bosch Tronic electric water heaters are sold in the US and Canada, except the last group that is sold in America only. The warranty is 8 years for tank-type heaters, while the tankless come with the 5 years only.

(Pictures courtesy of Bosch)