Shower buffer storage

Yes, it looks like the 210-liter variant then necessarily uses solar as well. Since you did not plan for that, it will probably remain at 150 liters. My experience with a 160-liter tank and only one shower: It can already get tight if someone showers extensively, so I suspect that 150 liters with two showers will be even tighter.

Best regards

K1300S

How many liters of hot water does your heater produce per minute?

Best regards,

Manuel

That must have been around 15 liters per minute. I should check the exact value, but as I said, it was only noticeable after showering for a longer time. A ten-minute break was enough for hot water again.

Best regards

K1300S

In the meantime, I spoke again with a contact from Junkers. Apparently, the model is also installed in 3-family houses. I will report what practice shows. If it is not sufficient, then another buffer tank will simply be installed in the house (that's how it's done, right?)

My parents have an 80 (eighty!!!) liter tank on the still perfectly functioning gas heater from 1986, and with minor limitations, it even worked in a 4-person household with two showers... Of course, 10 minutes of showering was not possible, but I have to say it worked (almost) well for 20 years. I obviously didn’t want that in my own house today, but 150 liters for 4 people should still be bearable under decent conditions depending on shower habits.