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

Bookstar schrieb:

Here’s another update from me 🙂

Over the past 10 days, we’ve averaged a heat output of 80 kWh and an electricity consumption of 19 kWh daily. This means the heat pump is working with a coefficient of performance of about 1:4, which doesn’t seem too bad.

To reduce the heat demand even further, I lowered the heating curve by 2 degrees. Right now, because of the sun, we have the problem that we need to ventilate a lot during the day to avoid overheating (with outside temperatures of 30°C (86°F), the window is basically open almost daily), and at night, when it drops to 0°C (32°F), the heating has to run again.

I want to offset this effect with the lower heating curve, since the sun warms up the rooms sufficiently in the morning.

Let’s see if it works and saves electricity 🙂

Wow... 19 kWh just for the heat pump in this weather and temperature range. It feels like the house is less efficient than before, doesn’t it? It’s not the heat pump’s fault. You and the house set the required heat demand.

You definitely need a photovoltaic system!

Hmm... but that still sounds like a lot, doesn’t it? The self-regulating effect doesn’t seem to do much for you :p
The question is whether adjusting the heating curve is the right step. You’ll have to fine-tune it again as soon as it gets colder. You’re changing the slope, which means the effect is stronger at lower temperatures than at higher ones.
I would rather consider shifting the heating limit or adjusting other parameters.
Or am I wrong?

In the last 10 days, we’ve used about 40 kWh on average, including hot water. I think we rather have a high hot water consumption. 2 adults + 2 children. There are many showers, and we all spend more than just a short time under the shower. Can you break it down? How much hot water do you use per day, and how many people?
Unfortunately, I only have the internal meter, which only shows electricity for hot water. Last 10 days about 3.5 kWh per day (with about 9.5 kWh total consumption for heating + hot water).

Day before yesterday/yesterday average temperature 8.7°C (47.7°F), used shower and full bath, daily consumption 21.297 kWh

Yesterday/today average temperature 8.1°C (46.6°F), daily consumption 12.608 kWh
Gas BWT

Our pump is currently barely running; this morning it ran for a few hours. Electricity consumption for heating and hot water is about 4-6 kWh per week.

Zaba12 schrieb:

Wow...damn, 19 kWh just for the heat pump at this weather and temperatures. It feels like the house is less efficient than before, doesn’t it? It’s definitely not the heat pump’s fault. You and the house set the required heating demand after all.

You really need solar panels!

I don’t think it’s that bad at all. February will probably end up with a total of around 700 kWh, which is actually quite good. It was really freezing, on average about 3°C (5°F) colder than last year! So it’s still pretty cold. But sure, a few kWh less would be better 🙂. For hot water, we need about 3-4 kWh per day of electricity on average, even in summer. That leaves about 15 kWh currently for heating. Considering the cold nights, that’s understandable.

Since we will soon have 2 electric cars and next week will also add a sauna, I will definitely put the topic of solar panels on the list for 2022 🙂

My average before this week was 16 kWh per day since mid-October, which I find quite high given the temperatures.