thescruff
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Lots of potential issues, The pump in a system boiler is likely to be on the return, whereas the existing pump is likely on the flow, this can upset the balance unless you intend to have a sealed system and do away with the header tank.
Normally a pump inline will be ok but I wouldn't advice it without seeing the system and any implications.
Sounds like the system has been extended a few times and with that in mind I'd sooner upgrade the pipework
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