Heating offer comparison - Please share your experiences

2019-11-21 12:48:13

Those who are commercially very clever and like to gamble build today with a fossil energy source and replace the system in 15 years with substantial environmental subsidies. Plan connections already now...

Those who think not only of their wallet but also of the climate and descendants exclude fossil fuels from the outset in their new building.

2019-11-21 12:55:42

Yes, that's correct. If you rely on very inexpensive heat pump models, it can be cost-effective. The question is whether these devices are suitable in terms of comfort, e.g. noise at the installation location / performance with high heat demand in cold winters / hot water comfort in general, and of course how long these cheap things really last. I am already annoyed by these 300-liter tanks. Space requirement, incubation of germs, standby losses. And the good systems with fresh water station then cost significantly more again. Of course, a lot depends on the planning, but ultimately this "it depends on the planning" often turns out to be wishful thinking in practice. As I said, anyone planning something like this should definitely also consider realistic, binding offers for maintenance and also not ignore taxes on self-generated electricity. Two points that are unfortunately often forgotten. Annual performance factors also obscure the special demand in particularly cold winters. In fact, many then mainly heat with purchased electricity.

May I ask what you pay for your gas condensing boiler with underfloor heating and so on? So the "cheap heat pumps" are not no-names either... These are manufacturers like LG or Panasonic!

2019-11-21 12:56:56

I absolutely don’t know anyone who has a maintenance contract for their heat pump, let alone has it serviced annually. Myself included (but I don’t have an outdoor unit). These are hermetically sealed systems. The brine had to be refilled shortly after commissioning, since then the fill level has been stable.

Whether it’s worthwhile or not, you only find out afterwards anyway. There was no gas here at all, so the decision was clear.
The heat pump was more expensive to purchase, including drilling, than gas, but there was a €5000 subsidy. I just got it now, the gas newcomer will get it in 10 years or whenever the exit happens.

2019-11-21 12:57:42

Those who do not only think about their wallet but also about the climate and future generations exclude fossil fuels from the outset in their new building.

I agree, you should also think a bit about the environment! And the price difference is not enormous regarding purchase, consumption, maintenance, etc.

2019-11-21 13:04:15

Caution with the demonization of fossil energy. Car, one! Nissan Leaf. Annual mileage 20,000 km. Results in 100 full charges at 45 kWh each, equaling 4500 kWh electricity demand per year. Our annual consumption without a car for two people is 1800 kWh. These are the ratios. With an electric car plus possibly a heat pump heating, 200% more electricity demand per year. Scale it up to all of Europe....where should this electricity come from if not also fossil or nuclear power! Figures from the ADAC

2019-11-21 13:07:46

Everything very nicely said.

A small addition:

Rough rule of thumb: A photovoltaic system produces about 1/8 of the output in winter (Nov-Feb) compared to summer (Jun-Aug).

Even in the summer half-year (April to September), the solar yield is 4 times as high as in the winter half-year (October to March). Or in other words: only 20% of the yield occurs in the winter half-year, precisely when the yield would be most needed.

PS: Namesake of Lef's theorem?

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Heating offer comparison - Please share your experiences

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