I can only relate my experience with these units and it has been very good. As for how many showers you can take at once, I turn other things off when I take a shower on my current electric heater. There is only 2 of us, so we do not often take a shower at the time. I do know that no matter how long a shower I take with the AquaStar there will always be hot water for my other half when they are in the shower. That is not always the case with the standard electric hot water heater. I would question whether you now have enough water pressure to handle multiple things running and take a shower. Try running 2 showers with your current system and see how it goes, and check what your flow rate is with both going. You can then check it against what the documents say about flow rates for the Aqua Star. The benefits as far as I am concerned for the heater far outweigh not being able to take multiple showers at once, if that turns out to be the case. You could always just shower with your other half... Good luck
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