escapizm wrote:Using the excellent batch sparge and boil calculator on 18000feet i need 27.1 litres for the boil. is that the qty in the HLT, i put in the final FV vol was 20 litre and used the eg's for the rest of the figures. ie 4kg, 2.5:1 etc etc
I think Im gonna need a large bucket say 10 gallon as a HLT and would a normal 5 gallon do as the kettle for the boil? should i put two elements in both? as back up and for getting to boil quicker then i can turn off 1?
Thanks
I think you're getting this a bit wrong.

I use a 27l Cygnet (Burco) as my HLT for 5g brews and have no problem at all. Firstly, assuming 5Kg grain bill that means you need to mash-in with 12.5l of water. Mash-in, refill HLT and leave mash for 90 minutes. After 90 minutes, add first sparge addition and whilst leaving it to rest add a little more water to the HLT to ensure you have enough for sparge 2. You can almost get away without the last step but I usually run out just short so tend to heat more water up now.
The quantity in the HLT does not need to equal that of the boiler as in effect you are using the water three times and can therefore top-up between each addition. You can easily get away with a 27l HLT, perhaps even smaller, what you really need is a big boiler as it's here where shortcomings will give you boil-overs. I personally use the H&G 10g plastic boiler and there's no way on this earth you'll ever get a boil-over with a 5g brew and I've managed several 10g brews in it too with few problems.