Yesterday morning i stupidly didnt do anything and had frozen pump, reels and pipes, spent a good hour or so thawing it out.
I put the immersion on this morning for about 3-4 hours on timer, water was about 45 degrees, ill admit it isnt hot at pole, its warm less shock to the hands but it kept the van frost free, all pipes reels and pump were fine and i was out on first house at 9 this morning...not 10.30 like yesterday!
Well recommended