I am installing a split easy-fit air conditioning system in my house,
and I have a need for the pipework between the indoor and outdoor unit
to go above the height of the indoor evaporator (basically, up into
the loft, and then across to the external wall).

I believe that I need to install a small condensate pump to assist the
flow of drained condensate. (it only needs to pump about 12 inches
above the height of the evaporator).

My question is... does the condensate pump have to be installed at a
similar height to the bottom of the evaporator unit? i.e. at the same
level as the contents of the drainage reservoir in the evaporator? Or
can it be installed at a higher level, and somehow maintain a head of
water to syphon the condensate from the evaporator?

Also, I noticed that most of the mini condensate pumps seem to come as
two parts, one of which can be fitted within the evaporator's drainage
tray, and one that can be put into trunking in line with the drainage
tube. Is this an either/or option? I don't particularly want to take
the evaporator apart and install things in it, so I'd like to just
have something in the trunking.

Thanks for any suggestions / advice!

James