As 3GGG says, all the heated nozzles do, is to stop them from freezing up... your actually washer fluid may still freeze however and it certainly wont make them squirt hot water as some have thought.
The heated mirrors, however, that come in this £40 pack, are VERY VERY useful in all weathers! Even rain just disappears - I miss this hugely when I drive another car and it is money very well spent indeed.
As most have said, the £40 alone for the heated Mirrors is worth it. Can't really comment on heated nozzels, but never had a problem with the freezing as I always put anti freeze washer fluid to protect to -10 degrees
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