ᐅ Recommendation for Digital Heating Thermostat

guckuck2 schrieb:

Where exactly do you read something like that?
Faulty systems shouldn’t be used as a benchmark. Old buildings neither.

But nothing against gas; it works too, though it’s getting more expensive all the time (CO2 pricing). For me, it doesn’t belong in any new build anymore.

I read that here in the forum. There is a topic about electricity consumption. In my opinion, these are already new builds. Certainly bigger houses, but not three times as large.

And electricity isn’t getting more expensive?

nordanney schrieb:

That fits. With a heat pump, 1,000 kWh of electricity produces between 4,000 and 5,000 kWh of heat energy. That should be enough for your 80 m² (860 sq ft) new build.

So far, I can only share what I’ve read here in the forum. People mention efficiencies around 3,... but rarely reaching 4.
And I never see references to 1,000 kWh consumption, not even 1,500 kWh (when you scale it according to the square meters). Especially since hot water and cooking are additional and independent of the floor area.
But I don’t want to argue about that, as I have no experience. I’ll have to look into it more thoroughly in the coming days because an offer we received includes KfW 55 standard if we choose a heat pump instead of gas. It’s just that gas feels familiar—I know what I have and what it costs. With electricity, I’m not sure.

motorradsilke schrieb:

I am familiar with gas, so I know what I have and what it costs. With electricity, I don’t.

I’m just talking about the CO2 tax. Please tell me what you know about gas that you don’t know about electricity (which you may even generate and store yourself).

motorradsilke schrieb:

And I never read about 1000 kWh consumption, not even 1500 kWh (when you scale it up per square meter). Especially considering hot water as well.

You also don’t read about 80 m² (860 sq ft) houses here, but about 180, 200, or 240 m² (1,940, 2,150, or 2,580 sq ft). From my own experience, I can report that you can heat a 300 m² (3,230 sq ft) house with a reasonably sized geothermal heat pump for around 50 € per month, including hot water, at 22°C (72°F).

nordanney schrieb:

I’m just mentioning the CO2 tax. Please tell me what you know about gas that you don’t know about electricity (which you might also be able to generate and store yourself).

You’re not reading about 80 m² (860 sq ft) houses here, but about 180, 200, or 240 m² (1,940, 2,150, or 2,580 sq ft).
From my own experience, I can say that you can heat 300 m² (3,230 sq ft) with a properly sized ground-source heat pump for around €50 (about $54) per month, including hot water at 22°C (72°F).

For gas, I know that I currently pay about €600 (around $645) for my poorly insulated 80 m² (860 sq ft) house with old windows. It can’t be more for 110 m² (1,185 sq ft) built to new standards with underfloor heating.
For electricity, I don’t know. Generating and storing it myself is probably inefficient for us since the roof will be oriented east-west. I can’t predict the price trends for either, but I only know that electricity prices have risen more sharply than gas prices in recent years.
And that was the catch I suspected with your costs: you have a ground-source heat pump. How much more does that cost to purchase and install compared to a gas boiler or an air-source heat pump? Do you also need a mechanical ventilation system with heat recovery? Both will probably exceed our budget — we are already over it.
Can you also provide realistic figures for an air-source heat pump for 110 m² (1,185 sq ft) including hot water for two people?

motorradsilke schrieb:

Can you also give me realistic values for an air-source heat pump for 110 sqm (1,184 sq ft) and hot water for 2 people?

For 2020, based on 186 systems, an average annual performance factor (APF) of 3.73 (partly including screed heating); in 2019, with 193 systems, an APF of 3.6. Usually includes hot water as well. Annual performance factors close to 5 have also been observed.
So, if your demand is between 5,000 and 8,000 kWh (this depends on the house and your usage patterns), you can expect to use around 1,700 kWh of electricity. A well-designed system with moderate room temperatures, not immediately set to 24°C (75°F) in all rooms, might use about 1,250 kWh; a poorly implemented system with unfavorable user behavior could use up to 2,500 kWh. That equals roughly between 375 and 750 in annual energy costs.

Thanks for the data, I will think it over again. Is this related to your profession?