ᐅ What is currently the best heating system?

I’m actually only marginally interested in this... The first year is not really representative anyway. Just the screed heating system alone already consumes around 6,000 to 7,000 kWh.

I think what Charlie Brown is getting at is that at -20°C (-4°F), an air-source heat pump functions as a purely electric heater, meaning you could just as well use electric space heaters. An air-source heat pump only has a good efficiency at ‘warmer’ temperatures; when you really need heating (in winter), the efficiency is not that high.

Best regards

K.Brodbeck

Yes, I know that myself. But it’s not that dramatic. As I observed in February, the heating element switched on at -10°C (14°F). Until then, the pump managed on its own. How many days a year do we actually have temperatures below -10°C (14°F)…

Hello,

K.Brodbeck schrieb:
... that at -20°C (−4°F) an air-source heat pump is purely an electric heater, meaning you could just use electric space heaters instead. An air-source heat pump only has a good efficiency at ‘warmer’ temperatures; when you really need it (in winter), the efficiency is not that good.

There is a lot of misinformation about air-to-water heat pumps; they are definitely not just electric heaters.

As with most things in life, it is crucial to have a well-designed system and to install a unit that matches the actual heating demand. When these conditions are met, the proportion of supplemental electric heating remains within reasonable limits. By the way, no heating system operates without electricity.

Kind regards

With gas boilers, the electricity costs are almost negligible. They range between 100 and 200 kWh per year for the circulation pump, ignition spark, and valve. That roughly translates to 50 € per year.

Häuslebauer40 schrieb:
Yes, I know that myself. But it’s not quite as dramatic as that. From what I observed in February, the heating element switched on at -10°C (14°F). Until then, the pump managed on its own.

From a technical standpoint, this bivalence point sounds quite reasonable. Unfortunately, the fear of the heating element often leads to oversizing. The builder is happy because they have sold a more expensive unit than may actually be necessary. The problems (lifespan, seasonal performance factor) usually occur mostly under partial load conditions, especially near the heating limit, particularly with ON/OFF devices that cannot modulate.

Häuslebauer40 schrieb:
...How many days a year do we actually have below -10°C (14°F)...

The number of days is irrelevant; what matters are the hours at those outdoor temperatures. What seasonal performance factor is being achieved?

Best regards.