In general, the thermal reservoirs are manufactured with an internal auxiliary heating system that are activated by temperature controllers that guarantee the complementation of the heating on days when the sun is not sufficient to supply all hot water demand.
Electrical resistance: it is a set of electrical resistances installed inside the thermal reservoir that acts as an accumulation system allowing to use a lower power to accumulate hot water, unlike the electric shower which, because it is a passage heating system, needs a higher power to heat the water instantly if it’s not at the right temperature. The use of electrical resistance is more common in homes with showers and other hot water consumption points. For larger systems, such as hotels, hospitals and gyms, a set of electrical resistors is necessary to guarantee the hot water reserve in rainy and cloudy periods.
