Personally I don't like the look of the HotShot, it's designed more for clearing the screen at startup than during driving. It takes a while to heat up then shoots a sequence of pulses at the screen.
The biggest
problem I find is that the jets freeze up when travelling at speed due to windchill - they can be fine at the start of a journey (if you've enough screenwash) but then freeze up at the nozzles (seemingly regardless of how strong the screenwash is).
I don't think heating the pipes by routing them next to coolant pipes will
help much, as the
problem occurs at the nozzle which won't get heated and blocks flow.
I'd say the best option is to get the OE heated jets from a dealer, then try and work out where the wiring/plumbing goes - and once you have, tell me, and I'll buy some too
They are fitted as part of the "Winter Pack" which was only available on the continent, I bought mine abroad but they wouldn't let me have a winter pack with a RHD car for some reason