The fan heater is an accumulator that integrates a thermodynamic group. This group allows, through the change of state of the refrigerant liquid, to obtain the heat from the air and heat the water contained in the accumulator tank. This must be sized according to the needs of hot water in the home (there are several models).
The fan heater is an interesting solution for small and medium consumption of hot water. In addition, they are a simple system for replacing solar thermal energy and indicated for reform projects, replacing obsolete electric water heaters. They represent a small initial investment that is quickly amortized due to the significant energy savings achieved.
Another great advantage of the fan heater is that we can cut electricity consumption in half to heat the water.
In many cases, the reduction in consumption can be much greater, reaching 75 % depending on the COP of the appliance (the COP defines the performance. For example, a COP of 4 implies that with 1 kWh of electrical energy spent, the fan heater produces 4 kWh of thermal energy, obtaining a performance of 400 %.
Usually these devices can heat the water up to about 60 ºC. A temperature that is sufficient for the use of the DHW.
In accordance with the provisions of the Basic Document HE4, in its section 4.1., we are told that the daily consumption of DHW, with the reference demand at 60ºC, is 28 litres/person.