In my thesis, I deal with heating circuits, where several heat generators are present, e.g. a combined heat and power unit and a supporting boiler. Usually, the boiler is placed in front of the heat storage tank, but I have also repeatedly seen heating circuits where the boiler is placed behind the heat storage tank.
For example, the structure of the heating circuit of an IEEE paper:
What are the advantages and disadvantages?
Do I understand correctly that if the boiler is in front of the heat storage tank, the water of the heat storage tank is heated and if it is behind it, it has its own reservoir of water which it heats?