I'm thinking of putting a small radiator in my scullery which is the ground floor.
The only possible way to get the feed and return pipes to the radiator would be to drop down through the ceiling from the 1st floor heating circuit and return back through the ceiling
My gas boiler is on the ground floor, the system is a pumped, with 3-way motorised valve, open vent with header tank in the loft above the first floor and hot water tank on 1st floor.
My (simple?) query is: will the hot water get pumped down and return back to the circuit, or will I end up with a cold radiator and thus have wasted a load of time and effort?