Interestingly that link (the way I read it) implies that the unit is not pre-wired for you, however, I've been in the shop and was sure I saw them all wired up in a box etc.
I have bought one of their units for heating and cooling on my fermenting fridge when i was new and scared of electrical work.
Works well, havent had a problem with it.
Not the cheapest option but you simply plug it in and it works....time is money.
BlackRat