I went from 50 liters to 32 for exactly the same reasons, after a certain amount of torture this spring trying to save the old calorifier
I have seven bunks on board without the salon
and sometimes that many people on board, so 32 liters is not ideal. Nevertheless, we seem to be more or less ok. Reality is that everyone on board can't take showers simultaneously. But I also increased the immersion heater to 1500 watts, and with three ways of heating
the tank -- immersion heater, engine coolant
loop, central heating
-- we do manage to get everyone showered without any horrible tragedies.
So I guess you will be ok, Bash.