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If, by the "bog in a box type" is like the one below then yes, I would agree, best avoided, as our one takes 2 and sometimes 3 full flushes, we have a 50 year one upstairs with the cistern mounted higher up with a connecting pipe and it gives a fantastic one time flush, only replacement was the...

I thought all the piping is 10mm??

I find it hard to answer that one (re extra rads), probably no big problem if you are not using all the rads at one time, on your existing system you might be able to see the boiler flow and return temperatures, what is the make/model of the Combi?.

I have a over 50 year old oil fired open vented system with some rads over 40 years old, with, being optimistic, traces of inhibitor but have no corrosion or sludge in any form, just wonder is it because the (non condensing) oil boiler's heat exchanger is just a mild still box, I never have...

The circ pump on a combi is used to circulate water through the radiators or through one side a small plate heat exchanger with mains cold water being heated on the other side of the heat exchanger so the circ rate (via a high pump head) is designed to allow full boiler output to heat the...

Is it gas or oil fired, if oil fired the pump is (normally external) but I wouldn'y worry in the slightest about it, as said , its working fine, leave well enough, alone.

Circ pump might be set to and running at a high head.

That looks like the reason for the frequent boiler demand, it should really be on a timer of some sort or some form of temperature control, I would suggest that you just switch the pump off (will look at the pump data in a minute) say this evening/tonight and see does the frequent boiler demand...

There seems to be a pump located at the bottom of the cylinder, this may be a recirc pump to ensure HW is available instantly at all the HW users, this can result in a fairly hefty heat loss which causes the cylinderstat to cycle the boiler frequently, is this pump running all the time, can you...

Yes, but it seems that some will also start the boiler and others will not, like the (my) Honeywell, and while most wouldn't dream of draining or refilling a system without the power isolated, it can happen, but the valve MIs don't mention if the microswitch is made or not if the valve is opened...

Do you mean the boiler will fire up when the (EPH) valve is manually opened?, the Honeywell does not fire the boiler but when the valve is powered open then when the valve has passed the manually open position, the lever just falls (down) out of the latch so when the vale is de energised then it...

Do the above behave like my Honeywell ones in that when opened manually they do not close the microswitch to start the boiler?. This facility is normally used when filling the system.

If you don't wish to split the pump to inspect it you can just view it by removing the pump and look in at the impeller from the inlet port. And the same pump with the head removed.

You should give the F&E Cistern a thorough clean out before refilling the system. Also consider isolating the pump, remove the 4 stud bolts and pump head and clean out the impeller vanes with. a steel scriber or small screwdriver and a tie wrap, those Selectrics are outstanding pumps.

Again, as stated above I think, the increase in pump press is a indication also that there is water in the system so I wouldn't, rule out the pump completely, especially if old, if the boiler has a pressure gauge then you should see the pressure increasing by around 0.2bar when the pump starts.

What is the exact model Grundfos pump? If its a 6M UPS3, then guaranteed problems running It at speed 3 if the pump is healthy, try speed 1.

The series 4 Vaillants are heat only boilers and as stated above have a external pump so have a look at its mode and setting.

I would think that the coil would emit at least 20kW especially if/with a flowtemp of 80C. I wouldn't expect a coil dT of more than 10C, if so then the flowrate required would be 28LPM, IF the actual flowrate is 15LPM, then at 20kW, the coil dT would have to be 19.1C, again unlikely. If the...

These, I think are limited by the 12LPM regulation for mains boosting, is this flowrate good enough for you?

For interest, what does this manual procedure do?, does it, like some A rated circ pumps, speed up/slow down/almost stop the pump, for about 10 minutes?.