It is. It serves both for heating the radiators and for the warm water in the sinks/shower/dishwasher/laundry, but I understand both to be separated systems fed

It is. It serves both for heating the radiators and for the warm water in the sinks/shower/dishwasher/laundry, but I understand both to be separated systems fed by the same heat pump. The boiler is not huge, but it has enough water for 2 or 3 people showering in a row, depending on how quickly that happens and what other things sre using hot water now. It doesn't take super long to have hot water again, but it depends on how cold it is outside. On colder days it obviously take longer.