You dont need an Urn - If you have the time you just fill the robobrew to full (30 litres) and heat up full volume to your sparge temp (75 degrees or so) once at temp - drain the water out and keep it aside for sparging ( you will need a vessel that holds 21litres if you use a 19 litre mash. You set the timer before you go to bed and when you wake up your water is heated
Or you could buy an urn - or a sous vide thing - or just sparge with cold water - apparently doesnt make much difference (but adds time)
You will need some silicone tubing - this is true - needed for the mashing process - although maybe the new versions come with a bit - not sure.
You dont need fittings for the immersion chiller if you use the no chill or hot cube method - but you will need a 21 litre food safe cube/container - otherwise you will need some fittings for the immersion chiller
to connect to a standard tap etc - also there is a size difference on the immersion chiller and a standard hose
A mash paddle - Yes to this too
Optional extras...
* I bought a kitchen scale and some containers and marked them up with accurate measurements of water volumes
* Hop spider or hop socks
* a tea strainer to put over the overflow valve - added safety net (pun intended)
* A cover to insulate the robobrew to minimise heat loss (but dont cover the base)
* some insulation around the pipe as this is where a lot of heat can be lost - like a heat exchanger
* A milk crate - allows airflow around the robobrew !
Im about to brew batch number 30 in mine (gen 2) -its been awesome