The scheme represents a simple and compact system, typical of single-family homes, two-family homes or small commercial spaces, in which the production of domestic hot water (DHW) is managed through a single storage kettle. This is a reliable solution, particularly suitable when using generators with limited power, such as heat pumps, as it guarantees the availability of DHW even with low loads.

The temperature of the kettle can be regulated in two ways: through a mechanical thermostat, which controls the ignition of the pump or generator according to the temperature detected, or through an electronic probe, which allows a more precise and continuous control of the accumulation, improving the efficiency of the entire system.

Thanks to the simplicity of the system, the DHW distribution circuit can be designed with or without recirculation. In environments with short pipes or where use is infrequent, recirculation may not be necessary, contributing to greater energy efficiency. However, when recirculation is envisaged, a thermostatic mixer can be integrated to control the outlet temperature, so as to ensure user safety and avoid sunburn.

From a hygienic point of view, this system does not allow the thermal disinfection of the distribution network, which is why it is recommended only for networks of limited extension, where the residence times of the water inside the pipes remain limited.

In conclusion, it is a compact and reliable solution, which offers good performance in thermostatic mode and excellent in the case of electronic regulation, while requiring greater installation spaces than instant generators.