ᐅ Installation of a Gas Heating System in New Construction 2023/2024

Hello again,

Bausparfuchs schrieb:

Heaters older than 30 years must be replaced.

Like many things you write, this is once again incorrect....

This explicitly does not apply to low-temperature and condensing systems. These were already standard in the 1990s. If you still find a constant temperature heating system in the basement, it is probably much older than 30 years. Replacing it would likely be a very good idea...

Andreas

andimann schrieb:

Hello,

What on earth are you always doing with your 60°C (140°F) supply temperature? Are you trying to heat your sauna directly with that, or do you only have heating pipes without radiators on the wall?
I grew up in a house built in 1971 with quite basic insulation. That was back when oil was just a few pennies, and radiators were even installed in garages to keep the car from freezing.
Our supply temperature in winter never exceeded 37-40°C (99-104°F), which was completely sufficient even with the poor insulation and standard radiators. Only during extreme frost would it go up to 45°C (113°F), and that was enough.

A small tip: keeping the windows closed helps a lot in winter...

Andreas

Oh, storytime—I'll get the cookies.
I've lived in 4 rental apartments so far, and in none of them would I have managed a mild winter with only 40°C (104°F) supply temperature...

Nowadays, even heat pumps for new buildings are typically designed for around 38°C (100°F) supply, unless someone here ignores the forum advice and insists on pushing 25°C (77°F) supply temperature—no degree more—leading to something like 2.5 kilometers of heating pipes being installed in the screed at ProHaus...

They're saying 37-40°C (99-104°F) is enough for normal wall-mounted radiators? Quickly file a patent for that, we’ve discovered a new physics!

By the way, the CO2 price for 2027 is far from settled. A lot can still change. We are currently in a war and, in Europe, also experiencing a slowly taking shape, massive economic crisis.

I’ve already lost count of the U-turns made by politicians on major decisions.

Intel, which was actually planning to invest several billion in Magdeburg, has already said, “More funding from you and guaranteed electricity prices below 8 cents, or we’d rather build in the ‘land of the brave.’ Uncle Biden is happy to provide the funds.”

By the way, I have no intention of heating with fossil gas either. Green methane would be preferable to me.
Because the idea of converting electricity into hydrogen first, then storing it, and later converting it back into electricity in winter, sending it through power lines we don’t have enough of to run heat pumps...
That’s absurd. There is a dense natural gas network beneath Germany.
Converting hydrogen directly into methane and burning it in heating systems—efficiency of 110%.

Besides, what are all the gas power plants supposed to do in summer? Just stand idle and cost money?

This rotary motor must be Habeck’s advisor. Do you have experience in writing children’s books or studying philology?
Well, there’s no physics involved in that, that’s true.
And what the farmer doesn’t understand… he laughs about it. Right? 😉

Oh, I see, you’re not writing all that nonsense as satire after all?

xMisterDx schrieb:

So 37-40°C (99-104°F) should be enough for regular wall-mounted radiators? Quickly file a patent on that, we’ve invented new physics!

Unfortunately, that’s not possible because it’s not new. Of course, that’s sufficient, and you can easily calculate it yourself. Grab a good book on thermodynamics and get started.
The circulation pump must, of course, be set so that the last radiator still receives heat.
The heating then ran continuously through the winter, almost 24/7, not this nonsense of nearly turning the heat off during the day. The amount of heating energy a house needs remains (mostly) the same whether you run the system continuously at a low level or only switch it on for two hours in the morning and evening. In the latter case, of course, you need more pressure in the system—that is, higher flow temperatures.

The 38°C (100°F) flow temperature as a standard design, even for heat pumps, comes from the potential savings for heating professionals and from completely outdated calculation methods that assume winter temperatures of -30°C (-22°F) for weeks. Unfortunately, it also stems from insufficient knowledge of thermodynamics among heating technicians. And, of course, no one wants to complain later that the bathroom doesn’t reach 25°C (77°F) or so.
Technically, what they are doing is complete nonsense. Whether 25°C (77°F) flow temperature is truly necessary can be debated. For a modern house, around 30-33°C (86-91°F) should definitely be enough.

Best regards,
Andreas