The DeltaSol MX operates Solar closed loop system consisting of 2 loads: DHW, heating Buffer storage. The back up of Space Heating and DHW is provided by a single stage low mass Boiler together with solid fuel/ wood boiler loading heating Buffer storage tank. Home distribution incorporates single hydronic heating circuit (HC) controlled by floating action 3-way mixing valve with temperature compensation using Outdoor Reset and Indoor temperature Feedback. The DeltaSol MX provides Warm weather Shutdown (Summer Mode), boiler differential and 7-day programmable Setback control functions for all hydronic loads. Solar heat dump function prevents collectors from stagnation and activates Solar Pump and Heat Dump Valve if collector temperature reaches high limit set point.