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A little late, but,
if it it is a combined washer/condensing dryer,
I agree with Tester,
as who knows what the trickle of water has collected from the deposits on the inside surface of the waste pipe.
If it is a standalone condensing tumble dryer, it should be free of minerals.
I have used condensed tumble dryer water for both car coolant system topping up,
(caution; I only own essentially fully depreciated nth hand cars),
and
in an 'espresso' coffee machine, (caution; I do not claim to have a discerning palette).Cars continue to run, coffee machine not yet sucumbed to the hard water of Three Valleys/Affinity.
Is the water that is condensed in my tumble drier sufficiently distilled to use in a steam iron or steam cleaner? Thank you.