KfW 55 without underfloor heating

Karsten, that is the mentioned coziness. Because everything is evenly warm and there are no cold surfaces in the house, it feels warmer. By the way, you won’t reach 15 at night. More like 19, maybe 18 if you’re unlucky. If it’s too warm for both of you, adjust the heating curve of your heater properly. If the OP wants to save money: no false shame. I’m happy to give a tip via PM on how to do it cheaply with some DIY effort.

True. At ten to seven in the morning, bathroom, there’s a radio-controlled clock on the windowsill with a thermometer, 17.8 degrees. It definitely wasn’t much colder at three in the morning either, on the windowsill, inside the room it will be eighteen plus. Too warm for sleeping, for example, we were used to fourteen. So, in the bedroom the window is constantly open. I don’t set anything there, Joe. I’ll have the heating technician come again and have him set it up so we don’t have to do anything. I refuse to just leaf through the Junkers manual, let alone read it. It hardly has any pictures anyway. And it’s quite thick, that thing. I only read the quick manual, which almost only has pictures, and the conclusion was, set it to auto. End. Karsten

Brr 18 degrees in the bathroom and 14 for sleeping, you really don’t need heating anymore... practically the warming from the sun and the devices+residents in the house are enough

Well, my mother also sleeps without heating and with the window open in any weather. I wouldn't even go to bed with a jacket on. Everyone just does it the way they like. Yes Karsten, but the HB doesn't set the heating curve to 100% for you. However, that's not really necessary for you either, since you have a gas heater that can handle that. I would just try to keep it running on low flame as long as possible. The new boilers don't tolerate the constant on/off cycles that well anymore.