Marc

Hi, I want to calculate a system with 2 boiler tanks. One boiler tank is for sanitary water, the second is a buffer for heating support. This second buffer has a solar coil at the bottom, and also a coil at the top. This is used to preheat the sanitary water that is feeded into the sanitary water tank. This has the advantage that the sanitary water tank can be smaller because the water can take the energy from the buffer, and in winter the system can collect the solar energy at low temperature. But I can't see how I can introduce this second coil in the system. BR Marc