At present, we offer only one type of SHW of the highest class – a vacuum-tube thermosiphon system under high pressure with a heat tank and electronic control. This is the newest, most reliable, simplest and highly efficient (96-98%) solar hot water system. Its high efficiency allows it to generate heat even during the gloomy days of winter, which is why it is very suitable for use for domestic heating complete with a heat pump, a steam heating system or simply connect it to the underfloor heating pipes of your home. This system does not need a pump, heat exchanger and a number of other secondary components of a standard solar installation. In addition, due to the availability of heated water capacity (from 150 to 500 liters) through which domestic heating water passes, this system maintains a significant heat capacity even at night, which distinguishes it from standard systems. In practice, this is a complete analogue of the batteries of the photovoltaic system, which give it reliability and independence throughout the day. From an economic point of view, it is the most efficient and fastest paying-back solar hot water system.