spruce
belive me they keep you warm in a hgv,lived with one for best part of 14 year,has a driver over europe
I agree, they work fine, but having them ticking over as a frost heater every winter night I believe won't work. I would hate the expense of running mine at 5 to 10 degrees every night.
Also mine hasn't got a silencer and sounds like a jet engine on takeoff. I can hear it get going while I'm around the back of the house cleaning windows. OK to use during the day, but neighbours would object at night.
I use it to keep the van cab warm for the dog during the day and also to defrost myself as and when - getting soft in my old age.