ᐅ Supplemental Heating with an Air-to-Water Heat Pump and Solar Power System?
Created on: 9 Jul 2015 10:54
J
JeanetteL
Hello everyone,
After initially focusing on a gas condensing boiler and a ventilation system for a long time, we are now reconsidering whether another heating option might be better.
The additional cost for an air-to-water heat pump is lower than the price for a gas condensing boiler plus underfloor heating, ventilation system, and gas pipeline with one house provider since the standard package already includes underfloor heating and the ventilation system. So far, so good.
Now we want to discuss this scenario again with our current favorite, Okal House. With this provider, we would also consider adding the “solar power plant” – a photovoltaic system with battery storage.
My question is: With a combination of an air-to-water heat pump, a ventilation system with heat recovery, and the solar power plant, would it still be necessary to use electric heating at any point? We live in the Rhine region, where temperatures are among the mildest in Germany – it is rare for temperatures to drop below 15°C (59°F), if at all.
The house will be a simple single-family home with 1.5 floors and about 150 m² (1,615 sq ft). We currently live here as two people.
Thank you very much for your help – additional tips that could make our decision easier are also welcome.
Best regards,
Jeanette
After initially focusing on a gas condensing boiler and a ventilation system for a long time, we are now reconsidering whether another heating option might be better.
The additional cost for an air-to-water heat pump is lower than the price for a gas condensing boiler plus underfloor heating, ventilation system, and gas pipeline with one house provider since the standard package already includes underfloor heating and the ventilation system. So far, so good.
Now we want to discuss this scenario again with our current favorite, Okal House. With this provider, we would also consider adding the “solar power plant” – a photovoltaic system with battery storage.
My question is: With a combination of an air-to-water heat pump, a ventilation system with heat recovery, and the solar power plant, would it still be necessary to use electric heating at any point? We live in the Rhine region, where temperatures are among the mildest in Germany – it is rare for temperatures to drop below 15°C (59°F), if at all.
The house will be a simple single-family home with 1.5 floors and about 150 m² (1,615 sq ft). We currently live here as two people.
Thank you very much for your help – additional tips that could make our decision easier are also welcome.
Best regards,
Jeanette
Northern Germany, Bremen Area
Urban villa 171 m² (1839 sq ft), KfW 70 standard
(Brick facade with 2 cm (0.8 inch) air gap, 14 cm (5.5 inch) insulation, 17.5 cm (7 inch) Ytong blocks, triple glazing with U-value 0.6).
Insulation of the top floor ceiling 24 cm (9.5 inch), 10 cm (4 inch) perimeter insulation.
Yes, 2 heating systems.
The original plan included a gas condensing boiler and controlled ventilation system. Since the air-to-water heat pump replaced the controlled ventilation, the investment costs for the systems remained almost the same.
KfW 70 because I decided on photovoltaic later.
The system works very well, and in winter I hardly ever risk activating the electric heating element, as the air-source heat pump only needs to produce a maximum of 35°C (95°F).
Any disadvantages from direct ventilation without a heat exchanger in the ventilation duct are compensated by the control system.
Ultimately, I am not focusing on the type of heat generator but on how, through a well-designed measurement and control system, the interaction between generators and consumers leads to efficient cost management.
Unfortunately, it is now common that each trade works independently and does not consider the overall concept, and installers often do not offer such integrated solutions.
From my experience, photovoltaic combined with an air-source heat pump is definitely worthwhile.
Including tax rebates, my return on investment is about seven years.
Cheers
Urban villa 171 m² (1839 sq ft), KfW 70 standard
(Brick facade with 2 cm (0.8 inch) air gap, 14 cm (5.5 inch) insulation, 17.5 cm (7 inch) Ytong blocks, triple glazing with U-value 0.6).
Insulation of the top floor ceiling 24 cm (9.5 inch), 10 cm (4 inch) perimeter insulation.
Yes, 2 heating systems.
The original plan included a gas condensing boiler and controlled ventilation system. Since the air-to-water heat pump replaced the controlled ventilation, the investment costs for the systems remained almost the same.
KfW 70 because I decided on photovoltaic later.
The system works very well, and in winter I hardly ever risk activating the electric heating element, as the air-source heat pump only needs to produce a maximum of 35°C (95°F).
Any disadvantages from direct ventilation without a heat exchanger in the ventilation duct are compensated by the control system.
Ultimately, I am not focusing on the type of heat generator but on how, through a well-designed measurement and control system, the interaction between generators and consumers leads to efficient cost management.
Unfortunately, it is now common that each trade works independently and does not consider the overall concept, and installers often do not offer such integrated solutions.
From my experience, photovoltaic combined with an air-source heat pump is definitely worthwhile.
Including tax rebates, my return on investment is about seven years.
Cheers
We also have a KfW 70 house with a partially heated basement, just under 200 sqm (2,150 sqft), located in a cold region – with heating and hot water costs of about €50/month (approximately $55) – relying solely on a ground-source heat pump and controlled residential ventilation with heat recovery – without photovoltaic or solar panels. According to the climate map, we live in climate zone -16 degrees Celsius (3°F), while you are in zone -10 degrees Celsius (14°F).
Considering that you have two heat generators AND photovoltaic panels, I find €15-20/month (approximately $16-22) very high. And the photovoltaic system is supposed to pay off within 7 years?
What are your house’s primary and final energy demands per year and per square meter?
Considering that you have two heat generators AND photovoltaic panels, I find €15-20/month (approximately $16-22) very high. And the photovoltaic system is supposed to pay off within 7 years?
What are your house’s primary and final energy demands per year and per square meter?
Sorry,
you didn’t quite understand.
The heating system was not more expensive for us,
because either a gas condensing boiler with controlled ventilation or an air-source heat pump combined with an air-to-water heat pump was available at the same price.
What pays off after 7 years is the photovoltaic system including the installed control system.
I can provide the numbers next week. I am currently on vacation...
With only the air-source heat pump, our heating and hot water costs would be around €90 (about 4100 kWh consumption).
you didn’t quite understand.
The heating system was not more expensive for us,
because either a gas condensing boiler with controlled ventilation or an air-source heat pump combined with an air-to-water heat pump was available at the same price.
What pays off after 7 years is the photovoltaic system including the installed control system.
I can provide the numbers next week. I am currently on vacation...
With only the air-source heat pump, our heating and hot water costs would be around €90 (about 4100 kWh consumption).
Elektro1 schrieb:
Sorry,
you didn’t quite understand.
The heating system wasn’t more expensive for us,
because either a gas condensing boiler with controlled mechanical ventilation, or an air-source heat pump combined with an air-to-water heat pump, was available at the same price.
What pays off within 7 years is the photovoltaic system including the installed control system.
I’ll gladly share the numbers next week. I’m currently on vacation...
With only the air-source heat pump, our heating and hot water costs would be around €90 (about 4100 kWh (14,000 BTU)) consumption)Gas condensing boiler with controlled mechanical ventilation, or air-source heat pump and air-to-water heat pump at the same price? I believe the first combination would be significantly cheaper (controlled ventilation for 170 m² (1,830 ft²) around €9,000 and €2,500 for the gas boiler).
In my opinion, several thousand euros less than the price of the second combination.
4100 kWh (14,000 BTU) consumption for 2 people in a mild climate region in a 170 m² (1,830 ft²) KfW 70-standard house for hot water and heating is quite reasonable. Just my non-expert opinion...
We had just under 200 m² (2,150 ft²) of heated space in 2014, in the coldest climate zone in Germany, 4 people, with less than 2000 kWh (6,800 BTU).
Enjoy your vacation—and try not to spend too much time on forums while you’re away.
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