Hello, im in the process of converting my 19g/70l kettle to electric and am wondering if this http://www.aliexpress.com/item/AC-220V-4KW-Water-Boiler-Heater-Element-U-Shaped-Tubular-Bundle-Heater/32266871282.html 4kw electric element will be enough to boil 15g/55l of water (ambient temperature...