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Heidi19655 May 2020 23:13For our new build, we originally planned to install an air-source heat pump and generate the electricity for it, as well as part of our other electricity needs, with our own photovoltaic system and battery storage. After receiving two quotes, we now have some doubts. The lowest quote for a heat pump with 5.08 kW, a photovoltaic system with 5.1 kWp, and a battery with 5.12 kWh is €33,000. Should we rather choose a conventional gas heating system instead? That would definitely be cheaper. Or is that completely outdated now?
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knalltüte6 May 2020 04:39Hi, in the photovoltaic forum, the combination of photovoltaics and heat pumps is often discussed. It is generally advised against using energy storage because the (energy) storage is basically the underfloor heating or the heat pump’s own storage. Also, such a small system is almost useless with a heat pump due to the winter/summer issue. Probably better: cover the roof fully with photovoltaics; battery storage only if it is very affordable due to subsidies or if you accept that storage is an expensive hobby but likely environmentally beneficial (self-sufficiency, less electricity from fossil fuels, etc.). However, this is borderline from an ecological perspective.
The energy performance certificates (EPCs) would also be helpful to roughly evaluate the offer: What does the heat pump cost (and what exactly is included in the offer), how expensive is the photovoltaic system, and what does the storage cost? (Also here: have the photovoltaic offer reviewed.)
The energy performance certificates (EPCs) would also be helpful to roughly evaluate the offer: What does the heat pump cost (and what exactly is included in the offer), how expensive is the photovoltaic system, and what does the storage cost? (Also here: have the photovoltaic offer reviewed.)
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T_im_Norden6 May 2020 06:31Only you can decide that yourself.
Calculate what you will pay for the gas heating system, including the installation, and compare it with what you will pay for the heat pump.
Don’t forget the 35% subsidy for the heat pump.
Then calculate the ongoing costs; here it depends on how electricity and gas prices will develop.
But no one can predict that for you.
In my opinion, a more important factor than the heat generator is a heating system designed as efficiently as possible.
Calculate what you will pay for the gas heating system, including the installation, and compare it with what you will pay for the heat pump.
Don’t forget the 35% subsidy for the heat pump.
Then calculate the ongoing costs; here it depends on how electricity and gas prices will develop.
But no one can predict that for you.
In my opinion, a more important factor than the heat generator is a heating system designed as efficiently as possible.
Hello,
why should a gas heating system be considered outdated? In terms of pollutants, they burn very cleanly, and the CO2 emissions are negligible compared to the emissions from construction. If you’re building with a basement, just consider that the concrete used in the house itself has caused more CO2 emissions than the heating system will produce in the next 15 years.
If CO2 is important to you, reduce your air travel. A single round trip from Frankfurt to Hong Kong, for example, equals about five years (!!!!!!) of heating a house with gas!
In terms of operating costs, gas heating is usually more economical. With gas prices around 5 cents compared to electricity prices of 26–28 cents, a heat pump would need a coefficient of performance well above 5.5 to be more cost-effective. Only ground-source heat pumps typically achieve that.
The initial cost of installing a gas heating system is definitely much lower, but as Rick already mentioned, you have to factor in the cost of the flue pipe and connection.
Additionally, gas heating is silent—no loud, annoying fan unit outside—and from what I’ve seen among my neighbors, heat pumps are still considerably more prone to issues and require more maintenance than gas heating systems.
If you decide to install a gas heating system, I would recommend making sure the heating loops in the screed are laid close enough together so that you can switch to a heat pump in 10 to 20 years if needed.
Best regards,
Andreas
why should a gas heating system be considered outdated? In terms of pollutants, they burn very cleanly, and the CO2 emissions are negligible compared to the emissions from construction. If you’re building with a basement, just consider that the concrete used in the house itself has caused more CO2 emissions than the heating system will produce in the next 15 years.
If CO2 is important to you, reduce your air travel. A single round trip from Frankfurt to Hong Kong, for example, equals about five years (!!!!!!) of heating a house with gas!
In terms of operating costs, gas heating is usually more economical. With gas prices around 5 cents compared to electricity prices of 26–28 cents, a heat pump would need a coefficient of performance well above 5.5 to be more cost-effective. Only ground-source heat pumps typically achieve that.
The initial cost of installing a gas heating system is definitely much lower, but as Rick already mentioned, you have to factor in the cost of the flue pipe and connection.
Additionally, gas heating is silent—no loud, annoying fan unit outside—and from what I’ve seen among my neighbors, heat pumps are still considerably more prone to issues and require more maintenance than gas heating systems.
If you decide to install a gas heating system, I would recommend making sure the heating loops in the screed are laid close enough together so that you can switch to a heat pump in 10 to 20 years if needed.
Best regards,
Andreas
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