Reply To: Boiler Flow Rate 1 month After Turning Down November 20, 2022 at 10:05 am #200994 JojoeParticipantSilly question your heating system may be sludge up need the system flushing out, I am assuming you have bled the system at the start of the winter season?Yep, it’s thirst thing I did when the rads weren’t getting hot.Enyaq EV