HELLO ONE AND ALL! NEW TO THIS SITE AS A POSTER, BEEN LURKING IN THE DEPTHS OF DARKNESS FOR A WHILE. MY QUESTION CONCERNS THE FEASABILITY OF ADDING ZONE VALVES TO BYPASS CONVECTORS, AS I HAVE 4 SEPERATE ROOMS THAT THE FLOW TO IS CONTROLLED BY A THERM IN THE HALLWAY, THAT IS HEATED BY A WOOD STOVE. HAD A HVAC COMPANY OUT AND THEY SAID ONLY WAY TO DO IT WAS TO ADD ALL NEW FEED LINES, AND POSSIBLY BE ABLE TO USE MY OLD LINES AS A RETURN. IS IT POSSIBLE TO USE MORE THERMS IN EACH ROOM TO CONTROL CIRCULATOR PUMP/ ZONE VALVES? I HAVE A 5,300+ SQ/FT HOUSE RUNNING ONLY 4 ZONES! ONE FOR THE ENTIRE UNFINISHED, UNINSULATED, 2700+, VERY OPEN FLOOR PLAN, ONE FOR THE MASTER BEDROOM, ONE FOR THE KITCHEN/DINING/GREAT ROOM, AND THE ONE THAT CONTROLS FLOW TO 4 ROOMS, OV VARYING SIZES AND CONVECTOR SIZES. A VERY POORLY DESIGNED SYSTEM TO SAY THE LEAST! IT IS ALL COPPER PIPING, AND THE BOILER IS A EARLY '80'S BURNHAM, PROPANE FIRED, UNKNOWN BTU'S AND UNKNOWN TANK SIZE. THANKS FOR ANY INSITE THAT CAN BE OFFERED.