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gorgonzolach
It's just been my experience of using them. The second boiler for steam is usually much smaller than the main one so it runs out quicker, if you pull a couple of shots and do some steaming at the same time you'll soon need both refilling and heating up at the same time meaning they both go slower. Doing one shot and steaming at the same time might be fine and it's certainly better than a single boiler or heat exchange set up so if it works, fine, but I'd be shocked if you could do more than 2 shots in a row while steaming without losing pressure.