Stepping up to BIAB/ All Grain

Sorry for delay in reply, will give you an answer soon, cheers mate.

Nah mate, not much thinking time, I just didnt see the message till this morning and had to go shopping lol
1. I think electric is the best, you don't run out half way through a brew and you can brew inside if needed. Either in and old keg or a pot.
2. Size. smallest you can get away with comfortably is 40L that allows for a few litres losses due to chillers and trub etc, though something like a robobrew is 35L but you dont have much loss in that type of system. 50L is great.. and you can do bigger brews without cutting down batch size.
3. Most mills will be able to run by drill, though you usually need a 13mm/1/2inch chuck, or get and adapter chuck from hardware shop. Biggest thing with drills is you need low speed and high torque, some drills have that some don't, going too fast is no good.
4. Robobrew is cheap, you can get away with spending less making your own.. pot, bag, burner/element, thats if you get a keg or pot cheap, for less stuff around you really need a decent element or high pressure burner (high pressure regulator on gas tank at least). There's great satisfaction in making your own set up, more flexibility in size etc. Its really hard to make that call for you, which way you should go. I find myself using the robobrew most of the time here because its fast and easy, cleaning is quicker etc than my 3V. A lot of people dont sparge with brew in bag, because it can be tricky, people say they dont lose efficiency but every time I havent sparged I have, its not much though. Robobrew has a small footprint with is an advantage, all in one. If I were to start again I'd go something like a robobrew, I prefer the design of the robobrew over Guten and even over Grainfather, though grainfather has a nice controller and wifi etc to be honest I'd have no use for the wifi, its fancy but not much use to me. I still really enjoy my 3V system but thats a whole different beast. I should stop rambling, myself I'd go for one of the urn systems over BIAB just for a slightly easier brew day. Robobrew has limitations like the most grain easily used is probably 6ish kilo, 6-7% beer, depending. So if you want to make 23L of 12% you're going to have a hard time in a robobrew sized machine, though it can be done with a bit of work. Advantage of BIAB that you make, you can always repair easily since you made it!
That may of made the decision harder?? lol Ask anymore questions you like, Cheers!

Yep no worries getting 21-23 Litres. Can fit probably 7kg of grain if you work it.
The immersion chiller works, it of course depends on your ground water temp. Its a little slow for the last bit of the chill and it uses a far amount of water, though you can recycle that water for cleaning, chuck it in the washing machine, water garden etc. There are more efficient chillers you can upgrade to later but immersion chillers are an easy first chiller. If using the immersion chiller hop spiders arent really necessary. I do use it sometimes, but most of the time I use a grain bag if I want to lessen the amount of hop matter in the wort .

I use both elements all the time and don't get scorching, I think you have to be careful to keep enough wort over the elements by just making sure you match your pump flow to the speed the wort is draining through the grainbed.
I cant say everyone wont get scorching but I never have.
Another reason they may say not to use both is that they think the heat of the element after turning off may make you over shoot your temps ?? I've never had any issues with that, that happens with any of the different units I've tried but I've never seen it as an issue, its so small and sorts itself out within a minute or two , Guten, Grainfather etc. It's not much and levels out pretty quickly.
I cant think of anymore reasons why they would say not to use both?