Why not? Because it can be 400l! 
Dont know, they told us thats good for 4 people household and they where correct.
If we would need more warm water I could easily raise (or rise ??? please correct it yourself to the best verb) temp to 55°C.
To be more exactly, I use a brine-water heat pump with intermediate circuit (behind clothes on pictures I sent you per mail) and heat exchanger to ground water. Thats for more security because “bad” aggressive water can easily totaly damage the heat pump exchanger (and so expensive compressor) and ground water can’t be determined by fluid from heater circuit.
With groud water it will constantly work with best performance factor as it got same temp 13°C all of the year (especially valuable in winter months).
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