In order to exploit all the capabilities of heat pumps in producing domestic hot water, it is necessary to consider the fundamental principles on which they operate.
A heat pump is, indeed, a heat generator that differs from a traditional combustion boiler. The traditional boilers with a heat exchanger to transfer heat between the water circulating inside the boiler and the domestic water are completely inappropriate for use with heat pumps.
In traditional boilers, the internal heating coil, if connected to a heat pump, inevitably leads to a reduction of the exchanges as the temperature in the tank rises (as the heat exchange is a function, mainly, of the temperature differential between the two fluids and of the exchange surface). This limits the power which the heat pump can supply and thus prolongs the time required to reach the usage temperature considerably. The most immediate drawbacks when using traditional boilers are: a reduction of domestic hot water availability and a limitation to the heating or cooling capacity. In ehpoca tank domestic water circulated within an instantaneous exchanger comprising a finned copper pipe submerged in the tank. This exchanger has a very large surface that guarantees excellent heat transmission from the “technical” water in the tank to the domestic water and thus ensures the constant supply of hot water for common residential consumption.
Thanks to the fact that domestic water circulates only inside the heat exchange coil, the likelihood of the building up of bacterial colonies (Legionella) is practically nil, different from what happens with traditional boilers.
The intermediate connectors make it possible to connect average temperature heating terminals such as radiators (for instance, the heated towel rails installed in bathrooms) without need to increase the system’s temperature and the consequent reduction of the heat pump’s SCOP.
The tank’s standard configuration includes a coil heat exchanger for connection to solar panels (for which the company supplies the connection control unit with circulation pump and electronic controls, upon request). This coil is mounted under a panel that, at its centre, contains a stratifying pipe that ensures considerable efficiency in the exploitation of this energy.