My thought is that if the water or debris is that high the drain placement is pretty far down on the list of problems you have.
Boiler condensate pipe into gutter.
Especially in the summer when some of the water has evaporated.
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The condensate is acidic enough to burn the feathers off a baby bird.
I always aim to have the condensate drain pipe come out just under the drip edge and extend an inch into the gutter.
It is ok for a boiler condensate pipe to feed into an ordinary drain.
The condensate pipe from our 5 month old condensing boiler feeds into the drain like the drainpipe from the gutters on the.
That puts it about three inches above any water or debris.
Condensate should only be discharged into an outside drain if there isnt a means discharging condensate internally eg teeing into a waste pipe from a sink or washbasin due to the risk of freezing if terminated outside and also should be at least 32mm but better if 40mm if outside.
It s possible for it to pool in the gutter and birds may come and bathe in it.
Condensate pipes should not discharge into guttering.
The pipe work from the boiler should be of a minimum 19mm id or as per manufacturer s instructions and the condensate discharge pipe shall be run in a standard drainpipe material e g.