Have start my immersion heater bought this year and am satisfied. I use it to heat rainwater for de workshop so you do on cold days when washing your hands do not freeze your fingers ^^ Even ice lies to melt relatively quickly with some skill, though the boiler is not designed for. Because there is a "minimum and Maxlinie" for the water level. Even after frequent disregard this advice, he continued faithful service providers and I could not see any "tempering colors" that arise when one puts the immersion heater dry and it overheats.
The 1000 watt are, I think, adequate. The price is right too! But what has bothered me: The cable is a bit short and stiff! Since the boiler does not weigh much suppressed to him fast times of the actually intended position away - maybe a softer cable should be used
I am with price - satisfied performance and it's what it takes!