Hello everyone,
After reading quite a bit in the forum about different heating systems, I am increasingly convinced that I would like to install a gas condensing boiler. The concept of air source heat pumps does not convince me in cases of low temperatures, and ground or water source heat pumps are not allowed on the intended plot.
My current idea is as follows: gas heating + support for domestic hot water production through photovoltaic panels + a ventilation system with heat recovery.
The house will be about 150 sqm (1,615 sq ft). I have a few questions for you:
- Does this combination make sense?
- Why are solar thermal systems typically used? Do they have a better efficiency for water heating than photovoltaic? The advantage of photovoltaic would be that the electricity can also be used for other purposes...
- What about the costs? Is photovoltaic more expensive than solar thermal? How much does a ventilation system with heat recovery cost for a 150 sqm (1,615 sq ft) house?
Thanks in advance for your valuable help in this jungle.
Best regards,
Herr Stein
After reading quite a bit in the forum about different heating systems, I am increasingly convinced that I would like to install a gas condensing boiler. The concept of air source heat pumps does not convince me in cases of low temperatures, and ground or water source heat pumps are not allowed on the intended plot.
My current idea is as follows: gas heating + support for domestic hot water production through photovoltaic panels + a ventilation system with heat recovery.
The house will be about 150 sqm (1,615 sq ft). I have a few questions for you:
- Does this combination make sense?
- Why are solar thermal systems typically used? Do they have a better efficiency for water heating than photovoltaic? The advantage of photovoltaic would be that the electricity can also be used for other purposes...
- What about the costs? Is photovoltaic more expensive than solar thermal? How much does a ventilation system with heat recovery cost for a 150 sqm (1,615 sq ft) house?
Thanks in advance for your valuable help in this jungle.
Best regards,
Herr Stein
You combine an energy source that can efficiently produce high temperatures (gas) and use it for generating low temperatures of 30°C (86°F) for the underfloor heating, while the energy source that operates most efficiently at low temperatures (heat pump) is left to produce the hot water. Somewhat confusing.
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Username_wahl14 Oct 2016 21:29We have a gas condensing boiler with a solar system and a buffer tank. Independently of that, decentralized ventilation with heat recovery. With this, we achieved KfW55 standard.
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Goldi0911114 Oct 2016 22:38It would be helpful if the wall construction is always mentioned.
I believe KFW55 is only achievable with a gas condensing boiler combined with solar panels as well as controlled mechanical ventilation, and in our case a 36cm (14 inch) T7 MW.
I believe KFW55 is only achievable with a gas condensing boiler combined with solar panels as well as controlled mechanical ventilation, and in our case a 36cm (14 inch) T7 MW.
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Username_wahl15 Oct 2016 10:23Timber frame construction with cellulose insulation, insulated ground slab (glass gravel). U-value 0.235 W/(m²·K) for the building envelope.
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Goldi0911115 Oct 2016 11:10I thought so...
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