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I'm using a magnet (sorry - my terminology was wrong). Would it also be attracted to the Aerjec? Another observation - When the boiler is running the radiators and boiler are getting hotter than ever before (ie before the last routine boiler service which was when I started getting problems...

Slight magnetic force on the "blue" part of the Aerjec and on the pump casing and the large nuts holding the pump in place. Is this because these items are made of a different (magnetic) material or is it likely to indicate blockages? No magnetic field found in any other pipes. Boiler...

Ok will get a magnet and try it out. Pump sounds ok - therefore suspect probably a blockage (would a plumber be able to "easily" find a blockage?) How is this checked? Thanks

Further update: Flow pipe actually remains at approx. 50C for several hours (overnight) while the cylinder is hot and no water has been run off (slightly warmer at the cylinder end rather than the 3part valve end of the pipe). Once some hot water has been run off the pipe goes cold. In...

Thick compressed 'foam' insulation in a "digestive biscuit" colour. yes - 50C Not immediately - stays hot (approx. 50C) for some time. If HW has not been requested it is cold. No - same temp it has always been - comfortable. All 3 pipes approx. 75C (peaking at 80C). It changes...

Aerjec orientation looks ok. Any way of checking if its clogged short of cutting pipes around it? Sorry - yes 71C is the return, flow into the cylinder is 77C. An infrared thermometer placed directly against pipes (either painted pipes or with tape on them where these are not painted)...

Bypass – can’t see anything that looks like a bypass and also can’t see any valve on the return from the cylinder. The set up seems to be such: Flow from boiler runs upstairs into the Aerjec, which has a flow output into the pump, in turn into the 3 part valve, which in turn goes one way to...

So is it possible that the engineer on the last service may have also adjusted the gas pressure? (ie in addition to the burner pressure?) or can this only be set on installation?

8 rads 80x50 double (1 set fins) 50x80 single (1 set fins) 50x60 single (1 set fins) 60x60 double (2 set fins) 130x50 single (1 set fins) 50x80 double (2 set fins) 50x50 single (1 set fins) 50x70 double (2 set fins) How do I check if there is a bypass?

By "boiler output" do you mean Burner Pressure? If not what is boiler output and how do I check this? I'm aware he changed the burner pressure. It had always been 14.2mbar but he changed it to 15.6mbar (he told me the reason for this is because the pointer on the boiler indicated 15.6). He...

LSV opened 1/2 turn = no change, 1/4 turn = no change - no making so much noise not really wanting to take it any lower. Bedroom = 310x320x230 Cavity insulated. 25years old. Loft insulation 20cm all over (& boarded) Double glazed window 170x110 Radiator = 80x50 double rad...

Sorry its taken so long to get back. I had (unsuccessfully) tried to balance the radiators previously then other matters prevented me following through. However having now had a determined effort to get a grip on this I discover that it is impossible to change the differential at the...

My terminology was wrong (sorry), it is an older non-condensing boiler. The differential at the boiler is 12C. The radiators heat up quite quickly (approx. 15-20mins to get to between 70-75C), however the room temperature does not heat up in the same way - it can take up to 3hrs to warm...

I understand the desired differential between flow and return at each radiator is 10-12C for a standard (not combi) gas central heating system. The difference in flow and return temperatures at each of my radiators is considerably lower than this. It varies between a difference of 2C (lowest)...