ᐅ Pellets combined with solar thermal or photovoltaic systems?
Created on: 15 Jan 2020 09:02
Z
Zigenpeter86
Hello everyone,
I am currently facing a small issue with planning the heating system.
A pellet stove with about 12 kW output is firmly planned. However, it should be supported by solar energy.
The question now is which option makes more sense...
1. Support from solar thermal system
2. Photovoltaics with an electric immersion heater in the buffer tank
Details:
Floor area about 175 sqm (1887 sq ft)
Building style: urban villa with basement
KfW 55 standard
Ventilation with heat recovery
Underfloor heating throughout the house
Orientation: south (10 m (33 ft) roof width facing south)
Roof pitch about 23°
The question is also which combination is best for subsidies/grants.
Thank you very much
I am currently facing a small issue with planning the heating system.
A pellet stove with about 12 kW output is firmly planned. However, it should be supported by solar energy.
The question now is which option makes more sense...
1. Support from solar thermal system
2. Photovoltaics with an electric immersion heater in the buffer tank
Details:
Floor area about 175 sqm (1887 sq ft)
Building style: urban villa with basement
KfW 55 standard
Ventilation with heat recovery
Underfloor heating throughout the house
Orientation: south (10 m (33 ft) roof width facing south)
Roof pitch about 23°
The question is also which combination is best for subsidies/grants.
Thank you very much
B
boxandroof15 Jan 2020 10:48Zigenpeter86 schrieb:
I don’t want an air source heat pump because of the electricity consumption in winter. I still see it as purely electric heating where I end up buying a lot of electricity in winter, and prices keep rising. Sure, pellets are getting more expensive too...If I were you, I would reconsider heat pumps. I think pellets are a mistake.By combining photovoltaic panels with a heat pump, it’s possible—thanks to government feed-in tariffs over 20 years and careful planning—to achieve zero heating AND electricity costs. This option also avoids the need for a chimney and involves low maintenance costs. Even after subsidies end, the outlook remains promising.
D
Deliverer15 Jan 2020 10:50Zigenpeter86 schrieb:
- I don’t want an air source heat pump because of electricity consumption in winter. I still consider it purely electric heating, where I have to buy a lot of electricity in winter, and it keeps getting more expensive. Of course, pellets are also becoming more expensive...That’s why people use air-to-water heat pumps. Nowadays, they are even cost-effective for renovation projects. In new builds (alongside ground source heat pumps), they are currently state-of-the-art.
Z
Zigenpeter8615 Jan 2020 10:52@nordanney
Air-to-water heat pumps... is such a heating system significantly cheaper to install than a pellet heating system?
Are there any comparison calculations available with the current energy costs?
The basement room will be built regardless of what equipment goes inside. If the heating system in that room is smaller, then another basement room will simply be larger. So, from a cost perspective, there is no difference.
In summer, I don’t want to heat with pellets at all, but only generate heat through solar support, therefore causing no additional costs.
In this case, solar thermal systems would be more efficient, while photovoltaic systems are more flexible when the storage is full.
Air-to-water heat pumps... is such a heating system significantly cheaper to install than a pellet heating system?
Are there any comparison calculations available with the current energy costs?
The basement room will be built regardless of what equipment goes inside. If the heating system in that room is smaller, then another basement room will simply be larger. So, from a cost perspective, there is no difference.
In summer, I don’t want to heat with pellets at all, but only generate heat through solar support, therefore causing no additional costs.
In this case, solar thermal systems would be more efficient, while photovoltaic systems are more flexible when the storage is full.
D
Deliverer15 Jan 2020 10:57If you don’t mind how much of your square meters (at €2000 each) are unusable for you, then you can of course ignore that in the calculation...
And just the costs for the chimney sweep alone mean you have been heating until March...
And just the costs for the chimney sweep alone mean you have been heating until March...
Zigenpeter86 schrieb:
The basement room will be built regardless of what goes inside. If the heating system in that room ends up smaller, then another basement room will simply be larger. So, in terms of costs, there is no difference. Well, that argument doesn’t make sense, like “I’ll build five rooms no matter what, but I won’t use one and just close the door.”
An air-to-water heat pump doesn’t have to be much cheaper than the pellet heating system—just a few thousand in supply temperature. The idea that you’d have excessively high electricity costs in winter and an electric direct heating system is nonsense; otherwise, that heating system wouldn’t exist.
Are you in a water protection area? Otherwise, with a high groundwater level, a shallow ground collector for geothermal energy is an excellent option.
B
boxandroof15 Jan 2020 10:57Zigenpeter86 schrieb:
Air-to-water heat pump... is such a heating system significantly cheaper to install than a pellet heating system?
Are there any comparison calculations with current energy costs? Energy costs: with a heat pump, you can convert 1 kWh of electricity into 4-5 kWh of heat without additional system losses from storage, pumps, or chimneys. There are almost no maintenance costs and no need for a chimney sweep. Electricity is becoming greener every year, and politically, it seems that electricity use will be encouraged in the future. Part of the electricity (20-40%) can come from your own rooftop.
With a heat pump, there is more potential for self-generation and savings. Whether this can be utilized depends on the individual situation. So potentially, yes: a heat pump can be significantly more cost-effective.
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