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Yes it is bud Each size of pipe work has a limit to the number and size of rads it can heat Is there any way some of the pipe work can be replaced with 15 mm pipe?

There is a similar alternative available at Toolstation which screws into the body of the(shorter)radiator I like them as they do not rely on the rubber seal and they do not look too shabby when in place, I seal them with Ptfe tape Item number varies as they are offered in different lengths...

The tails can be connected at the bottom Foxhole

Not sure if this will help in this situation or not but I have been told by others on here and by a Ferroli agent that with this group of boilers if swopping one thermistor you must swop both Don't know why, possibly something to do with the Pcb They must be Ferroli parts as well, not oem ones

The valve that the pipework connects to (red top r/h side of pump) opens or should open when pressures reaches or exceeds 3 bar The two faces/seats of the valve do not sit perfectly flat after this as dirt or tiny ices of grit cause this and it weeps , losing pressure

Where are you in brum? That heat exchanger has to come out to be cleaned, with acid such as brick/patio cleaner or spirits of salt

If it is leaking between the pump body and the plastic housing it is attached to , then it needs replacing. The pump body and housing are supplied together if it is a genuine Glowworm part You purchase.

Yes Do not repressurise the boiler to 2.8 again or you may find this happening where water leaks out below the pump and the housing it is attached to Over £200 for a pump with housing plus labour charge Although that only looks like a wee drip , it pizzas out if you try to put water into...