ᐅ Air-to-Water Heat Pump: Current Consumption and Data

Only 2 loading cycles per day are good; with the factory service settings, it was 5-6 per day. 50 degrees Celsius (122°F) and a 2 K hysteresis... and circulation set to comfort.

halmi schrieb:

What’s the benefit for you in the end? During the 2-3 weeks each year when the conditions apply, you don’t even save enough for a small cheese pizza and a soft drink.

In December, January, and February, you typically have over 80% of the annual consumption. Currently, a hot water charge uses about 1.3 kWh at our place, and we usually have two charges in 24 hours. Whether I get that energy from the roof or from the grid doesn’t really matter.

I can almost confirm that too. It’s not the hot water that uses a lot, but the heating operation. For example, at 48 degrees Celsius with a temperature difference of 7K, I have about 1 kWh consumption per charge. So every additional charge costs me either 0.258€ from the grid or 0.04€ via photovoltaics.
What really hurts is the heating operation drawing power from the grid for weeks on end.

So, 1 kW for 365 days, and then multiplied by 2 or 3 charges, adds up a lot.

The same applies to the ERR for 25 units with 1 W per day.

Then there is the circulation pump running 24 hours.

Well, assuming you can generate hot water with photovoltaic panels 365 days a year 😉 Also, at that moment, you lose the feed-in. We pay 24.5 cents per kWh and get 10 cents back, so the difference is only 14.5 cents.

In summer, with wonderfully warm weather, the heat pump operates well below 1 kW. And especially in winter, when it’s colder, you basically get no generation from the roof, or my modulating pump just runs continuously. The difference between producing hot water as needed (water at 48°C (118°F), 6 K hysteresis) or only at noon will realistically not be that significant. Two-thirds of our hot water cycles happen during the day anyway and automatically benefit from the photovoltaic power if it’s available at that time.

Everyone, what are your current energy consumptions like? Yesterday, I used 21 kWh with an average temperature of -1°C (30°F). I believe I used to easily consume around 30 kWh before.

Bookstar schrieb:

Guys, what are your current energy consumptions like? Yesterday I used 21 kWh at an average outside temperature of -1°C (30°F). I think I used to easily consume around 30 kWh before.

I agree. 21 kWh with a basement at -1°C (30°F) seems pretty reasonable to me.

We are ending today with a total house consumption of 19 kWh, of which 670 Wh was drawn from the grid.