Heat pump with photovoltaics vs gas and solar thermal

If I am not mistaken, you currently receive significantly less compensation for the fed-in electricity than at the beginning of photovoltaic systems. I doubt that the compensation will increase with rising electricity prices; rather, it will go in the opposite direction!

If electricity prices really rise, the feed-in tariff will also increase. However, in recent years electricity has not become much more expensive; only taxes/levies have been increased. For the end consumer, the electricity price has been nearly constant for the past 4 years.

Can you please stop that? It's annoying....!

Rhenish greetings

@Sarrus: Your statement is somewhat exaggerated..... How many people live with you, how much area do you have to heat.... Basically, you can say a heat pump with an average COP of 3 requires about 10 cents of pure consumption energy for 1 kW of heat without investment costs. If there are 3 of you and each showers 5 minutes every day, your 300€ electricity is already gone. Nothing is heated yet and waste heat is also not considered.

@Sarrus: Your statement is a bit simplistic..... How many people live with you, how much space do you have to heat.... Basically, you can say that a heat pump with an average COP of 3 requires about 10 cents of pure consumption energy without investment costs for 1 kW of heat. If there are 3 of you and each showers 5 minutes every day, your 300€ electricity is already gone. Nothing is heated yet, and waste heat is not considered either

Your statements are very simplistic. There are also no justifications or calculations (e.g., I do not recover the investment in 30 years... 9% return... I would always use solar thermal etc. etc.). So please take a look at yourself first. By the way, you can find all the details about my "construction" here in the forum (I have itemized all construction costs etc.) and in a post about heat pump experience also something about my usage. Besides, energy is measured in kWh, not, as you said above, in kW. Your example with showering costs me with the heat pump at most 500 kWh of electricity, so about 100 euros. That is still quite far from the 300 euros. And with a COP of 3, one kWh of heat with a heat pump currently costs 6.6 cents, so 35% less than you say. So come on, take a look at yourself and answer less simplistically next time.

I have now looked at your thread ... nice house.

You mention a consumption in your thread of 2000kwh, which for me would be around €600 heating costs and hot water, contrary to the €300 you stated.

Now the 9% return is quickly explained. I have an installed capacity of 30kw/peak. The system cost €57,000 net and generated a return of €5,465 net in 2015. (I have not considered taxes and depreciation here).

In 2015 I consumed 1800kwh of electricity and fed in 34,000kwh. I get €0.16 for the fed-in kwh.

I pay €0.31 per kwh electricity including VAT.

My building has a heated area of just over 600sqm, which would not be efficiently heated with a heat pump. Since I have a roof area of over 400sqm facing entirely south, it makes sense for me to install and use solar thermal and photovoltaics.

My heating system (Vaillant gas condensing boiler, 2000l buffer tank, Vaillant solar station) cost around €12,000.

This means I have about €8,000 less investment than your heating system. In return, I get about 100rm of wood.

And as for the wood: 1 rm of beechwood currently costs about €80. The rm of wood (about 550kg) corresponds to a heating output of 2000kwh => or €0.045/kwh.

Heating oil is €0.50/liter and has a heating value of 11kwh => similar with gas!!

When I now look at the costs, I do not make up the extra cost of a heat pump at all, so my statement is quite correct.