Recommended series: Shiheng, Shixiang, Shizhen, Zunning series
 
Bosch Group is a famous Fortune 100 company, in 1894, Bosch Group Junkers invented the first vertical gas water heater in history, officially opened the era of gas water heater for domestic use. As Europe's top supplier of heating products and hot water solutions, Bosch Heating entered the Chinese market in 1995, and gas water heaters are naturally its main products.
 
Bosch gas water heater products are refined and few, and there are only four series: Shiheng, Shixiang, Shizhen, and Zunning. Among them, three world series are strong row products, and the model names are AM, AA, AS, all of which are national level 2 energy efficiency. The Zunning series is a condensing gas water heater, the model is BS, the energy efficiency level is level 1, and the thermal efficiency of hot water with rated heat load is as high as 98%.
 
Among them, the Shiheng series belongs to the public model, using the original imported chip, the water flow, gas volume and other sets of data for rapid processing, water temperature fluctuation within ±1 °C, to meet the needs of general households. As the core of the gas water heater, the heat exchanger determines the heat utilization rate, and Bosch uses a unique O-shaped heat exchanger tube to increase the heat exchange area and ensure that the heat is fully and uniformly heated. The heat exchanger material is oxygen-free copper, which is a metal with excellent thermal conductivity, which is far better than iron materials. Oxygen-free copper material can effectively prevent scaling and oxidation, and is the most ideal heat exchanger material at present. The price of the 13-liter Shiheng series of models is about 3,000 yuan.
 
Zunning is the flagship series of Bosch gas water heaters, which adopts advanced condensing technology, is equipped with a moving coil gas proportional valve pressure stabilizing device and a water volume servo device, and the price of 16 liters is about 6,000 yuan. The series is equipped with a CO detection alarm that automatically shuts off the gas when carbon monoxide reaches 150ppm. However, since the strong exhaust water heater is often installed in the kitchen, the oil smoke in the kitchen may cause the sensitive alarm to misjudge the alarm, so it is recommended to stay away from the kitchen stove when choosing the installation location.
 
There are fewer options for Dr. gas water heaters, and there are few options for water output, but they are simple to operate and easy to clean, making them suitable for the elderly who live in different places. However, after-sales service has always been a major flaw for foreign brands, and Bosch's warranty period is only three years.