Are 5 liters of water per day normal for heating?

Are 4 liters of water/day normal for a new heating system (2-family house, 200-liter boiler) during domestic hot water heating? By that I mean the overpressure of the boiler. Some water is probably normal, but such an amount? Since the overpressure line is located slightly lower than the drain, I also don't know where to put the water... A lifting system would actually be a bit exaggerated. But I can't think of anything else. I would be very grateful for your help.