5 gal in a Mash and Boil. I'm adding about 2 gals via sparge to reach boil volume. It heats to 160 deg temp in a couple of minutes and beeps when it gets there. Thats about 3 or 4 dumps of 2 liters. Works fine. Beats what I've been doing which is room-temp sparge.2 Liters? I assume you are doing quite small batches.
The alternative was a hot plate, a pot and check it with a thermometer.
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