Thanks for all your helpful replies,
Dave Shaw,.... do you not find with the heat from the parasene heater, warming it all up from frozen....can crack the pump or the spindle on the reel...?. that happened to me last year...
so i want something to keep it frost free all night really.
Matt, how much water with antifreeze will i need to sit in my 100 mtre hose reel overnight?
silly question i know, but i may have to buy a winters stock of anti freeze??

and even after i have flushed it in the morning... are you sure the residue left behind in the reel and other hoses...will not affect the pure water during the day...as i clean?