I worked a full day today,.. only earned €230 though. It was -7 when I started and never got above -2 all day.
I won't lie, it was a tough day and I did have a little trouble with hoses freezing on the first job until the hot water got through,.. but after the first 5 mins everything went like clockwork. I used loads of salt (I prefer it to grit because there's no dirty residue when everything has melted,.. it just dissolves to nothing) under every window, and I chose my work carefully, but I got everything done that I wanted to. The salt is very effective,.. I have passed some jobs a few hours later & could see the snow & ice completely gone from the footpaths.
My biggest challenge was defrosting my transfer hose when I got home so I could re-fill the van ready for tomorrow.
There is no way I could have worked today with a cold system,.. so in just this one day my heater has more than paid for itself (again).