Yes I would add the grain to the water as it easier to let the water preheat the esky first. At least till you get the hang of your system.Ciderman said:Makes sense. I added the water to the grain, so next time I should get my temperature correct in the mash tun, then add the grain.
Also I don’t know if it’s been mentioned here but a 60L esky is a bit big for 25L batches so you will have a large headspace above the mash. It would be better if you could cut some insulation and fit it above the mash. Even a sheet of tin foil above the mash will help.