Pipe identification and magnaclean placement

30 Jul 2013
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United Kingdom
We've an old Potterton Kingfisher boiler with a pumped open-vented (I think) system. I was going to install a Magnaclean as I know the CH isn't the cleanest from radiator removal during decorating. I'm not 100% sure on the function of all the pipework:



1&2: This is obviously the shower pump outlets.
3: Connects from the motorised valve to the tank heating coil for DHW.
4: Must go to the CH circuit.
5: Boiler output to pump.
6: I think this might be a vent going to the cold tank.
7: I think this might be an inlet from the header tank.
8: HW tank feed coming from CW tank and entering bottom-right.
9: Shower feed coming from CW tank to the pump.
10: Tank heating coil outlet - but it splits into two immediately after exit. I think one might go to a towel rail in the bathroom and the other back to the boiler.
11: I think this is DHW from the tank to the shower pump, taps - and I assume it goes up to vent.
12&13: I suppose these are mains feeds to the expansion and CW tanks; I don't know why there are three.

The boiler is in a fitted unit in the kitchen; it's very snug and I have no way of fitting anything there. The floor is tiled so I can't fit one under a hatch in the floor before the CH return.

Choices are:

1) Put a magnaclean on the boiler output before the pump.
2) Leave it alone until I can access the floor around the boiler.
3) Something I haven't thought of because I don't know what I'm doing.
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