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

My BDT was 0.7. According to the energy consultant, this is a good, decent value.

Good value, we were at 0.9, but that doesn’t say anything about thermal bridges.

I wouldn’t overdramatize this for the transition period either. However, you did have disproportionately high heating costs even during the winter. So no matter what, you’ll have to take some action, whether that means continuing to pay higher electricity bills or something else.

If I were you, I would first gradually bring the household back to “normal” room temperatures so you can lower the return temperature.

I know you’ve already tried that. But you also gave in yourself.

nordanney schrieb:

No. An uninsulated house performs just as “well” as your insulated house. So the problem isn’t the heat pump, but the house itself.
Who knows how “good” your house really is, and not just on paper with favorable calculations.

On paper, every average case could be “favorable” compared to a different wind exposure.
Hardly any house behaves like the average.

berny schrieb:

Actually, right now is the perfect weather for an air-to-water heat pump + solar + battery setup: outdoor temperature above 6°C (43°F), so no energy-consuming defrost cycles. The heat pump regularly almost drains the battery for heating purposes (here, we’ve had a maximum outdoor temperature of about 13°C (55°F) for weeks), ...

It would be more effective to let the screed warm up by one or two degrees during the day directly from the sun. That way, the heating system wouldn’t need to rely on the expensive battery electricity, the heat pump would run more efficiently during the day, and you’re less likely to reach the 70% power reduction limit. Overall, you save money and do something good for the environment.

4lpha0ne schrieb:

Hardly any house performs like the average.

No, but a house with a heat pump is on paper more energy-efficient than one with gas or even oil, assuming the same construction method and location. Sometimes it is classified as KFW 55, sometimes as an energy-efficient house, and it would not be feasible to build it with oil.