Hydronic heating with satellite distribution stations for multi-temperature supply water to heating loops

A hydronic heating system having a source of hot supply water and a reservoir of cooler return water, a supply water line from said source, a return water line to said reservoir and a multitude of heating loops through which water flows from said supply line to said return line, comprising,

• (a) a main distribution station including a main supply header fed supply water by said supply line and feeding supply water to main heating loops, a main return header fed return water from said main heating loops and feeding return water to said water return line and a main pump that compels water flow from said main supply header, through said main loops to said main return header,
• (b) whereby said main distribution station heating loops are fed water at the temperature T,
• (c) a satellite distribution station including a satellite supply header feeding satellite supply water to satellite heating loops, a satellite return header fed return water from said satellite loops and a satellite pump that compels water flow from said satellite supply header, through said satellite loops to said satellite return header,
• (d) a satellite injection water line from said main supply header to said satellite return header,
• (e) a satellite return water line from said satellite supply header to said main return header,
• (f) whereby there is a water exchange between said main distribution station and said satellite distribution station that results in a net heat flow from said main distribution station to said satellite distribution station and said satellite station heating loops are fed water at a temperature lower than said temperature T and
• (g) means responsive to outside ambient temperature is provided for controlling said water exchange.