ᐅ Final House Planning: Heating Components, What Makes Sense – No Air Source Heat Pump
Created on: 10 Feb 2016 10:37
V
Veltins
Hello everyone,
After spending the past few weeks figuring out what, how, with whom, and how big we want to build, we are now focusing on what I consider almost the most important part: choosing the right technology, especially the heating and cooling systems. We are planning a 144 sqm (1550 sq ft) house built to KfW 40 standard. It will have no basement, located in a low-altitude area in NRW, and will house four people.
Our general contractor (GC) typically installs the following components:
- Nibe Fighter 755 G air-source heat pump (variant of the 750 model) combined with a solar panel system with 2 kWp output
- Underfloor heating on the ground and upper floors
- 180-liter (48-gallon) domestic hot water tank
Optionally, the following components can be installed at an additional cost:
- Expansion of the photovoltaic system to 3.3 kWp
- 7.0 kWh home battery
- Inverter
Our requests regarding heating capacity and expected electricity consumption have yielded rather unsatisfactory results. In other words: too much marketing talk and too few answers to ease my concerns, which are as follows:
- Is the Nibe 755 G with the small solar panel, despite good insulation, even sufficiently sized to handle 144 sqm (1550 sq ft) without continuous supplemental heating? Are 180 liters (48 gallons) really enough, especially with two small children? And does it make sense to invest a five-figure amount in expanding the photovoltaic system with a battery relative to the cost?
- Is an optional stove worth it at all? With around 7,000 EUR for the chimney plus the stove itself, economically, it doesn’t add up. We are almost ruling it out.
- What other “combinations” besides an air-source heat pump would you consider?
Basically, I am not opposed to an air-source heat pump, but if a projected annual need of 6,000 kWh for hot water and heating is the standard for this setup, then I currently achieve comparable costs with my existing 1990 house that has poor insulation and a gas boiler. You can guess which GC we are dealing with. Replacing the standard components is not easy.
I am about to consult a heating expert, as I really don’t trust the GC on this point, and they mostly just hire their standard suppliers to install standard equipment. Therefore, I would be very grateful for any expert tips on this topic in advance.
Best regards
After spending the past few weeks figuring out what, how, with whom, and how big we want to build, we are now focusing on what I consider almost the most important part: choosing the right technology, especially the heating and cooling systems. We are planning a 144 sqm (1550 sq ft) house built to KfW 40 standard. It will have no basement, located in a low-altitude area in NRW, and will house four people.
Our general contractor (GC) typically installs the following components:
- Nibe Fighter 755 G air-source heat pump (variant of the 750 model) combined with a solar panel system with 2 kWp output
- Underfloor heating on the ground and upper floors
- 180-liter (48-gallon) domestic hot water tank
Optionally, the following components can be installed at an additional cost:
- Expansion of the photovoltaic system to 3.3 kWp
- 7.0 kWh home battery
- Inverter
Our requests regarding heating capacity and expected electricity consumption have yielded rather unsatisfactory results. In other words: too much marketing talk and too few answers to ease my concerns, which are as follows:
- Is the Nibe 755 G with the small solar panel, despite good insulation, even sufficiently sized to handle 144 sqm (1550 sq ft) without continuous supplemental heating? Are 180 liters (48 gallons) really enough, especially with two small children? And does it make sense to invest a five-figure amount in expanding the photovoltaic system with a battery relative to the cost?
- Is an optional stove worth it at all? With around 7,000 EUR for the chimney plus the stove itself, economically, it doesn’t add up. We are almost ruling it out.
- What other “combinations” besides an air-source heat pump would you consider?
Basically, I am not opposed to an air-source heat pump, but if a projected annual need of 6,000 kWh for hot water and heating is the standard for this setup, then I currently achieve comparable costs with my existing 1990 house that has poor insulation and a gas boiler. You can guess which GC we are dealing with. Replacing the standard components is not easy.
I am about to consult a heating expert, as I really don’t trust the GC on this point, and they mostly just hire their standard suppliers to install standard equipment. Therefore, I would be very grateful for any expert tips on this topic in advance.
Best regards
Veltins schrieb:
If you want to avoid fossil fuels like oil and gas, and you are already aiming for KfW 40 insulation standards, are there other options besides an exhaust air heat pump that should definitely be considered? Air-to-water heat pump or ground source heat pump
B
Bauexperte10 Feb 2016 14:27Veltins schrieb:
Yep. For the expansion to 3.3 kWp, battery, and inverter. Tesla?
Regards, Bauexperte
B
Bauexperte10 Feb 2016 22:10@ Veltins
So I probably guessed correctly regarding your current favorite.
You can find a lot of information online about Nibe, especially from homeowners who have chosen your potential builder.
A fireplace is not cost-effective; it is more for personal comfort. Although there are now smaller fireplaces around 3 kW, sourcing wood and regular cleaning are required—this is a decision only you can make. Will it save on heating costs? No, unless you can get the wood for free.
Considering "other" heating options is unnecessary if you plan to sign with the supplier; of course, only if my guess is correct.
Regards, Bauexperte
Bauexperte
So I probably guessed correctly regarding your current favorite.
You can find a lot of information online about Nibe, especially from homeowners who have chosen your potential builder.
A fireplace is not cost-effective; it is more for personal comfort. Although there are now smaller fireplaces around 3 kW, sourcing wood and regular cleaning are required—this is a decision only you can make. Will it save on heating costs? No, unless you can get the wood for free.
Considering "other" heating options is unnecessary if you plan to sign with the supplier; of course, only if my guess is correct.
Regards, Bauexperte
Bauexperte
Our homebuilder also suggested a Nibe 750 as the preferred option. However, we could not come to terms with the idea of an exhaust air heat pump.
We have now decided on a Stiebel Eltron LWZ 504 (air-to-water heat pump with controlled ventilation).
(House 140 m² (1507 ft²), insulation KFW40)
We have now decided on a Stiebel Eltron LWZ 504 (air-to-water heat pump with controlled ventilation).
(House 140 m² (1507 ft²), insulation KFW40)
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