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Definitely not best practice, but with just a 25L electric coffee/tea urn, you can do a 20L batch, which is probably as much as you'll want to bottle (or put in a corny keg). If you are vigilant on watching the temp, you can do mash and boil in the urn pretty easily I find. To make your volume, though you have to top up with sparge water (you could just put your grain bag in that 5L pot you have and cover it with water) and often a couple times through the boil (which means it isn't all being boiled the full amount. This also gives you a bit of control around the gravity as your sparge water will be much lower gravity than the main mash you did in the urn, so you can mix to meet your target gravity.
jdmitch
Got you. Seems like I'm also gonna need pot big enough to boil enough water for the mash and to boil it again after? Biggest I own is currently only 5l.