Can't drain off hot water cylinder if header tank empty

[AGAS]

No, I do listen. I read 50 reviews of the pump on the Screwfix website, the great majority of which were very positive, and I read your 'review', where you kept repeating that the pump was 'shyte', without further explanation. So on balance I thought the pump was probably a good buy, especially as I also kept seeing favourable ratings for Salamander pumps (maybe not quite as good as Stuart Turner ones but a lot better than e.g., Wickes ones).

its a shame really I've still got 2 of them in the garage which i had to rip out and they read the reviews as well . i expect your the sort who reads and listens to the WHICH magazine as well , your pump is not only £100 just for a special deal you know . anyway you'll be safe with your which magazines .you will see soon