Hi .
Inspired by Nathaneal's hot water set up. I decided to experiment, so I filled a barrel up with hot tap water ( temp before I started cleaning was 55c), and cleaned my own windows that had a good months worth wind battered dirt, insect poo and salt grime - once the hot water came through ( which took a while to flush out the Di, and hose) it was a noticeably easier clean, and insect poo cleaned off very easily. i didn't measure the head temp, but I would estimate it was about 25 to 30 c. Hot enough to make the hose's soft .
I also got the impression that glass was drying quicker - but then it was there was a breeze, and relatively mild afternoon.
I can see a real advantage on ' 1st' cleans, gutters and conservatories - for maintenance cleans I think it would be an easier clean, and slightly faster.
I have found a heater for sale close to my home.
Its a Morco D61B Gas water heater.
Would this do the job?
The technical specs says it can take up 10 bar, and a rise of 25degrees c above the ambient, and flow rate of up to 6 litres per minute.
I can get it for a good price, but I may be a tad bulky, compared to the L5 to fit my Pug Partner van.
Thanks
Marc