I think Baz is pulling ya legs

But in all seriousness,
I don't do anything different in winter.
However I don't have anything in the van to frost damage even though I am wfp.
I have a removable battery/pump/controller box that I take in every night to charge, a tank and a hose reel and that's it.
I drain the reel each night, if it still freezes I use a backpack for first few jobs until temp rises.
No hot water, no overnight heater.
If its too cold I don't work, but that's maybe a day or two, compared to the expense and faffing about trying to combat nature.