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[sham]

need answers to the following questions.
1) When replacing a two port unit does the whole central heating system need to be drained.
2) Any-way to isolate before removing
3) Any benefit of using scale inhibitor products when there is a magnaclean on the system

[rosebery]

"1) When replacing a two port unit does the whole central heating system need to be drained."

No just below the level of the valve.


"2) Any-way to isolate before removing"

Drain below the level of the valve.


"3) Any benefit of using scale inhibitor products when there is a magnaclean on the system"

Different animals - do different jobs. So the answer is yes.

Cheers