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
D
Deliverer15 Jan 2020 10:12halmi schrieb:
I think once Ziegenpeter sees the precise energy calculations and the costs for that nonsense, the topic will be off the table anyway. Maybe he has a sawmill nearby? Or a swimming pool in the basement? Or his municipality sells sustainable pellets from their own forests to the citizens? He must have his reasons why a heat pump is "definitely" not planned.
B
boxandroof15 Jan 2020 10:37Zigenpeter86 schrieb:
The question now is what makes more sense....
1. Support through solar thermal
2. Photovoltaics with an electrical heating element in the buffer tank 3. Photovoltaics with a domestic hot water heat pump. Using the electricity directly for heating is not sensible.
Z
Zigenpeter8615 Jan 2020 10:38The estimate of about 12 kW comes from an "online calculator" provided by a boiler manufacturer.
I’m not sure if that much is really needed. However, I think that less power might easily be sufficient.
But so far, I have hardly found any pellet boilers with less than 10 kW.
A buffer tank with 1000 liters (264 gallons) is planned.
For me, a pellet boiler in a new build is quite straightforward.
- No gas available
- Oil is a no-go
- Geothermal heat with probes is not an option due to groundwater level and soil conditions
- I don’t want an air-source heat pump because of electricity consumption in winter. I still see it as purely electric heating, where I have to buy a lot of electricity in winter, which is getting more expensive. Of course, pellets will also increase in price...
It’s also a matter of personal belief.
I think pellets are a very nice and natural heating option.
Space should not be an issue. The basement for the heating system and buffer tank is about 28 square meters (300 square feet).
@boxandroof
What exactly is meant by the domestic hot water heat pump? I’m not familiar with that system.
I’m not sure if that much is really needed. However, I think that less power might easily be sufficient.
But so far, I have hardly found any pellet boilers with less than 10 kW.
A buffer tank with 1000 liters (264 gallons) is planned.
For me, a pellet boiler in a new build is quite straightforward.
- No gas available
- Oil is a no-go
- Geothermal heat with probes is not an option due to groundwater level and soil conditions
- I don’t want an air-source heat pump because of electricity consumption in winter. I still see it as purely electric heating, where I have to buy a lot of electricity in winter, which is getting more expensive. Of course, pellets will also increase in price...
It’s also a matter of personal belief.
I think pellets are a very nice and natural heating option.
Space should not be an issue. The basement for the heating system and buffer tank is about 28 square meters (300 square feet).
@boxandroof
What exactly is meant by the domestic hot water heat pump? I’m not familiar with that system.
N
nordanney15 Jan 2020 10:45Zigenpeter86 schrieb:
It’s really a matter of belief.Yep – and I believe that you save tens of thousands of euros by using an air-to-water heat pump. Just the basement space you save is enough to pay for the electricity needed for the air-to-water heat pump for the next 300 years.For the additional cost of your pellet heating system, you could heat for many, many years for free with an air-to-water heat pump.
Regarding the air-to-water heat pump, I would suggest doing better research. It’s always funny how people say "it uses so much electricity in winter," but the oil heating also consumes much more oil in winter, the gas heating uses much more gas, and your pellet heating also needs a lot more pellets than in summer.
Regarding the air-to-water heat pump, I would suggest doing better research. It’s always funny how people say "it uses so much electricity in winter," but the oil heating also consumes much more oil in winter, the gas heating uses much more gas, and your pellet heating also needs a lot more pellets than in summer.
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