Zoning my

I am looking some information on zoning my house the set up I have now is funny one But I have two pumps that pumps water to the rad and too hot tank. When I switch my boiler to hw the pump is wire to the bolier but it heats four rad downstairs when I want just hot water. My other pump witch has a switch on the counter heat one rad downstairs and there a second switch that turn on a valve to send heat upstairs. So I want to zone then to a nest but I don't want heat hot water every time I turn on the heating. Aslo in my bathroom there is a stud wall that is build of a block wall and I think that has the pipes going up to the hot tank as the tank is above it and to my rad because been a while from I was in an building of a house but there is a place were the pipes meet each other