Recommendation digital heating thermostat

"Warm feet" are an indication of a complete misplanning or misconfiguration of the heating system, even with gas. If the floor is so warm that you feel it warming your feet while wearing socks, the new building will be too warm. The only remedy then is ventilating against it. The consumption is, of course, anything but optimal in that case. One must be aware that this comfort demands corresponding consumption costs. Constantly warm, even hot, feet are unhealthy, by the way. Risk of edema. Ask your doctor. However, this does not mean that the tiles will be as cold as you might know them now. It is okay, but simply not noticeably warm. This only happens with us when it is below freezing outside (KFW 55) or in places where the floor distribution is located or in the area of the heating circuit distributor.

Honestly? That would be one of the reasons for me to build new in the first place. I finally want to be able to walk around the house in socks, currently I always need warm slippers.

Yes, you won’t need slippers anymore but it will still be far from warm feet. Provided you don’t want a sauna everywhere or don’t want to have the windows open all the time.

Has this changed drastically in the last approx. 10 years? With acquaintances in a roughly 10-year-old house, I always have warm feet, which is very comfortable for me.

No, nothing has really changed. Which brings us to the question what warm feet mean to you?

But how do I solve the "problem" that I want 25 degrees in the living room and bathroom, but only 18 in the bedroom? And the 25 degrees in the living room not all day, but only when I am at home, and not at night? Of course, I know that underfloor heating is slow. So my thought was to set it to the desired temperature in the respective room already a few hours earlier, but then also let it cool down earlier. Doesn’t that work?

The problem basically isn’t really there. People just aren’t used to the other side because they always had radiators everywhere. But that passes pretty quickly and you get used to the different way of heating as well as to the mostly homogeneous temperatures.

So, you don’t lower the temperature at night with underfloor heating, like with radiators? Isn’t that inefficient?

Those are two completely different solutions to a problem. Fast with a lot of hustle with radiators, and slow and steady with underfloor heating. The slow approach does not require lowering the temperature because that would just cool the house down and the underfloor heating would then have to run at higher temperatures during the day, which would again negate the savings effect.

Simple explanation: Fuel-saving driving style (underfloor heating) and full throttle (radiators). Both reach the goal, just at different speeds and with different consumption under otherwise the same conditions.

The best solution would be two heating circuits, one underfloor heating, one radiators, which can be switched on quickly if needed? But that would certainly be too expensive?

Not only expensive but completely unnecessary. Because you can also heat the place very well with just underfloor heating, it just takes longer but is cheaper if it isn’t an intermittently occupied property.

Also here an analogy with a car. You don’t install both a diesel and a petrol engine. While possible, the advantages are outweighed by the disadvantages.

And what do I do in the transitional period, in which so far I only heated the living room and hallway with the fireplace (that’s why we’re used to the 25 degrees)? Then I’d have to turn the heating in the living room to minimum, I would only want warm feet then.

You do absolutely nothing. Especially don’t fiddle with the controls. You set the heating once or twice, correct it a bit during the first two heating periods and then just let the devices do their job. Because then, provided you have no defects or major mistakes in the system, you will always have the desired temperatures during the heating season. All by itself without your intervention.

No, that has not changed. However, if you don’t necessarily plan efficiently, requiring a high supply temperature, you can also get really warm feet. With tiles, they feel even warmer than with parquet, for example.

The gas heating system is significantly more robust in terms of design than a heat pump. Which KfW level are you actually aiming for? And why gas at all?

We are not aiming for any KfW level at all. And gas, because we already have it on the property. We use it now; it is effective and proven. We pay for an 80 sqm house, with a normal heating system, with insulation on the walls but little in the roof area, just about €600 per year for heating, hot water, and cooking. And when I look at the electricity consumption costs of heat pumps here, I cannot be cheaper with that.

Yes, you won’t need the slippers anymore, but it will still be far from warm feet. Assuming you don’t want a sauna everywhere or constantly have the windows open.

No, almost nothing has changed. That brings us to the question: what are warm feet for you?
The problem isn’t really there. You just don’t know the other side because you had radiators everywhere. But that passes quite quickly, and you get used to the other type of heating and also to the largely homogeneous temperatures.

These are simply two completely different solutions to a problem. Fast with a lot of fanfare using radiators and slow and steady with underfloor heating. The slow approach doesn’t require lowering the temperature either because that would just cool down the houses, and then the underfloor heating would have to run at higher temperatures during the day, which would in turn negate the savings effect.

Simple explanation: Fuel-saving driving style (underfloor heating) and full throttle (radiators). Both reach the goal, just at different speeds and with different consumption under otherwise identical conditions.

Not only expensive but completely unnecessary. Because you can warm the house very well with underfloor heating, it just takes longer but is cheaper if it’s not a sporadically occupied property.

Also here an analogy to the car. You don’t install both a diesel and a gasoline engine. That would be possible, but the advantages are outweighed by the disadvantages.

You do absolutely nothing. Especially don’t fiddle with the controls. You set the heating once or twice. Adjust it a little during the first two heating periods, and after that you let the devices do their work. Because then, as long as you have no defects or major mistakes in the system, you will always have the desired temperatures during the heating period. All by itself without your interventions.

Hmm, warm feet are just warm feet, how should I define that?
The way I know it from my acquaintance who has underfloor heating. When I’m there, I immediately notice that the underfloor heating is on, I can walk around for hours with socks on and it’s comfortable, I don’t get cold feet. She also has an area where she doesn’t have underfloor heating, there the tiles are as cold as in our place, I don’t like standing there longer than a few minutes, I just get cold feet right away.
But then the flow temperature simply has to be a bit higher, I don’t care, I want to feel comfortable.

The problem with different temperatures in the rooms remains. How do you handle that? I simply can’t sleep at the same temperature as I have it in the living room.

We pay for a house with 80 sqm, normal heating, with thermal insulation on the walls, but little in the roof area, just about €600 / year for heating, hot water, and cooking.

Expensive fun. Half the cost as a KfW-55 house with a heat pump.

There still remains the problem with the different temperatures in the rooms. How do you deal with that? I simply can't sleep at the same temperature as I have in the living room.

Yes, you can. You can have the heating system designed a bit lower. and before going to bed, let in plenty of fresh air. That’s all there is to it. You will have to accept this fate – or keep a window always open and literally blow your energy out the window. And imagine, it even works in a 30-degree waterbed :D

Expensive fun. Half the cost as a KfW-55 house with a heat pump.

Hmm, here I read consumptions of about 6000 kWh per year for the heat pump. That would then be almost €2000. I also read things like that on the internet. €300 per year would be only 1000 kWh. With that, you can operate an air heat pump for a whole year, prepare hot water, and cook?