I just had my boiler and pump replaced. 1st and 2nd floor seem to be fine giving heat but the basement rads are cold and they used to be really hot.
this is my system
my heating guy - doesn't seem to be familiar with monoflow systems. I am suspecting that either the pump is in the wrong direction or maybe the velocity is too slow or too fast to get monoflow t valves to operate.
The supply loop running along the ceiling is hot as hell but the pipes running to the rads below the supply loop are cold as hell.
Can you help.