I've used these at around 5 psi for transfers and not had many issues. You will definitely see the lid start to swell and bulge a bit from the pressure but it shouldn't pop off if you're using under 5-7 psi or so.

I use fermenter in my heated basement in winter I set heat to 65F summer max temp is about 67 F.

I use a greenhouse garden mat to help maintain a minimum temp. when fermenting in an unheated work area.

I've used this in a temperature-controlled room (64deg for ales) and with a temperature-controlled stand up freezer (32-50 deg for lagers) with the controller probe taped to the side if the fermenter. For the freezer you can find controllers like Ranco that will allow you to override the freezers settings. I would also suggest that you replace the spigot with the FE741 stainless steel one from here. The one included will take you forever to transfer out of the 120L and is leaky.

I keep mine in a temperature controlled room and have no problems with it staying constant.

They fit perfectly into most standing freezers.

They have a heater that you can purchase from them out. Purchased it and then I’ll wrap a blanket around my barrelEnter an answer to this question.

these do appear to have about 1/8th additional headroom above the stated capacities from my rudimentary math/investigations.

Hi Michael - There should be plenty of headspace regarding the mentioned item.

U can fit in and reach the bottom of the tank to clean easily.dont have a tape or tank handy at the moment to give you exact dimensions

Hello Ryan - The Speidel FE725 does not come with volume markings.