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The hot water doesn't get hot, the pipes get hot (if you wait long enough) by convenction it seems. I turned off all radiators and water still doesn't get hot. The radiator feed pipes get warm eventually too. The boiler return gets hot eventually (presumably also by convection). If it is a...

So, I put in a new pump. No change, which shows I should have believed my own eyes. I worked out why the boiler wouldn't drain; the plug was blocked with crud. Fell out at the merest suggestion of a sharp poke. I drained it for 10 minutes or so but it was not help either. I now presume the...

I had go when I got home this week; drained the cleaner out of the system at all four drain poins on the ground floor. Close off the top floor radiators. I removed one upstairs because the valve leaks unless closed but realised it is 8mm pipwork not 10mm and i had only one (10mm) reducer...

Yes, although that particular radiator, a small one in the downstairs toilet, had always been ok. Since I have to remove a rad upstairs because the valve leaks if opened and the collar is jammed beyond moving, I am interested to look at the condition within generally and do them all if it...

well, the system always worked, after a fashion, pretty much regardless of settings, heat moved around, doors were open etc. The upstairs tended to be shut down more simply because heat rises. What I will do is shut down all the rads upstairs and see if the downstairs will get warm; at least...

not sure about the position at actual filling time but i subsequently put it mid-posn to test the flows. I bled the air off the top of the HW feed so i know water went in there ok and i felt heat along the radiator feed pipe too. it just seems to take a while, if ever, to reach the rads and...

yes, it is a more accurate name to be sure; bit longer to type! My main problem is that it seems to be operate but doesn't 'push' hard enough perhaps. One of my many questions was whether the impeller lateral movement might be a problem and/or the torque of the motor itself.

How much force should the impeller have? Does my system use only this pump? After reading a substantial number of articles, the story is as follows: System: Grundfos 10-50 pump drawing water from Netaheat 10/16 boiler, 1988. 3-way valve afterward feed heating coil and CH circuit. Microbore...