a big fat NO i have one used it a couple of times. its in the shed when its that cold you run the the risk of cracking glass
What a load of crap
Not a load of crap at all. If you are cleaning old style glass that's oiled floated, a lot of them are held in place with panel nails and covered with putty. When its near freezing in winter hot water users will run hot water over the glass. The heat disperses from the centre of the glass to the outer edges where the metal panel pins are and because of the sudden change in temperature the glass cracks occasionally due to thermal shock.
Even double glazed units are prone to thermal shock, I've had two units blow shortly after I cleaned them.Never use hot water anymore, at best mild water if need be. Apart from initial cleans and Plastics wet weather jobs, conservatory roof's, there isn't much requirement to use hot water.
How many suppliers want to sell you a hot unit, yet how many can be bothered to service it or repair it when it goes wrong?