With an accumulator tank in your system you do not need to fire up the boiler as often as when the boiler is connected directly to the heating system. You also exploit the energy that the fuel liberates significantly better, and create optimum conditions for environmentally sound heating. In Sweden, as in other countries, it is a precondition that the system is environmentally approved. A system that includes an accumulator tank is also more flexible because, in principle, the tank and boiler can be located anywhere, even in another building.
If you want to get the maximum use from your accumulator tank, the boundary between the hot and cold water must be sharp. There is a great difference in the heat gain from a tank with poor or non-existent separation and a tank with perfect separation. To achieve perfect separation, the hot water from the boiler must be added at a rate that does not disturb the separation.
The component that controls the addition of the heat, and therefore how well the separation functions, is called the charging unit.
You can, of course, regulate the temperature of your house manually, directly from the boiler. The problem is that the system then will not be harmonised with the indoor or outdoor temperatures – it will provide the same heat all of the time, not the heat that is needed to maintain the indoor temperature that you want.
The solution to this is an automatic control and regulatory system with sensors that respond to the outdoor and indoor temperatures. The regulatory system then makes sure that the heating system provides exactly the heat that is needed – neither more nor less.