Yesterday I drained my heating system so I could cut the pipes on one radiator to raise it. After refitting, I filled and bled all the radiators and they were all working. When I got up during the night to let my dog out, two upstairs radiators were still hot and hotter still when I got up this morning.

We have no hot water tank, its a direct feed system that works only when turned on, so no water is stored in an immersion heater. The heating system was not on. I've tried bleeding the two radiators again just in case, but no air came out just water.

  • So with the system off, water came out when you bled it? This was after you drained it? That doesn't make any sense... Something must be on and pumping.. – Steven Jan 24 '14 at 17:31
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    Are the radiators that are hot the closest and above to the furnace? – mikes Jan 24 '14 at 22:35
  • Is this piped in copper or cast iron? Hot water will circulate on its own in cast iron pipes – Joe Dec 14 '17 at 10:03

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