Ok, my house is currently on 3 zones, one for each level of our split level house. The main level of the house is our kitchen, dinning room, main living and also a sun porch on the back of the house which is now our sons playroom. The thermostat is in the living room at the front of the house. The entire house system has a single pump and then there are 3 zone valves that are each connected to a thermostat on each level.
We have baseboard heat with an oil boiler that runs as a backup if the OWB runs out of wood. Everything works really well, except the sun room tends to be really cold. It's all Windows and with the thermostat on the opposite side of the room, it's hard to keep it warm without over heating the rest of the house.
I would like to pull that room off the main floor loop and put it on its own thermostat. That way we can warm it up when he is back there and not over heat the rest of the house. What is the best way to add a loop without completely reworking the whole system? Should I add it to the main system and add a new zone valve? Should I add a new small pump just for that zone? I've done all the install work on my system so I'm not worried about doing the work, just want to know the best way to do it.