Hi All, Considering building myself a Mash Tun in the near future. I'm going to loosely follow *these* instructions: https://www.instructables.com/id/Build-Your-Own-Brewery-for-Under-100-STEP-1-/ I'm thinking it might be better to use a cool box and some copper piping than the stacked FV's. My question is how do i know the Cool Box i buy will be suitable and have sufficient insulation. I've seen them for as cheap as £16.00 (https://www.amazon.co.uk/Litre-Colo...locphy=9046634&hvtargid=pla-933154588712&th=1) While cost isn't the only factor in this, i am trying to keep costs to a minimum, i certainly don't want to be spending more on a DIY Tun and Boiler as I would on an All in One system. Anyway, any help is appreciated.