This is the one I have, in 750w: https://www.amazon.co.uk/gp/product/B07H6P9GCJ/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1
Quite a convenient way of doing it, I did about 150L last weekend and just left it to it, after a few hours it does heat up a bit which helps dissolve the sugar...