4000 W for 15gallon

[Subl]

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 is in the low 60s), i dont have acess to the 5500w low density ones u guys are using in america as they dont ship them over here.
My setup will be very simple with just the element and a switch connected to a 20a/220v outlet, it is biab so im planning on mashing in the same kettle.
Also im wondering how far from the bottom should i mount it, im worried the sediment might scortch it if i put it too low but at the same time i also need to fit an imersion chiller in there.
Should i just lower my preboil volume, maybe put some isolating material around the kettle or will i be fine?
Tnx.

 

[homebrewdude76]

Will be watching this thread.
I am wondering if 5500 watt is good for 15gal!

Maybe you can consider 2 elements?

 

[wilserbrewer]

IME, the sweet spot for 4000 w is around 10 gallons, likely work for 15 but will be a little slow heating and the boil will be on the milder side. Covering the kettle will help to reach temps and boiling may require the lid partially covering the pot. Try it, you could likely run two smaller elements to get 5000w if you want to step it up.

Insulating the pot will help a little.

 

[Subl]

Tnx, i thought about 2 elements but id rather go with 1. As long as it gets the thing to boil ill be happy, maybe ill put a small gas kitchen stove underneath for a little extra kick.

Its gona take a month for them to send it from china but ill report how it goes .