ᐅ Final House Planning: Heating Components, What Makes Sense – No Air Source Heat Pump
Created on: 10 Feb 2016 10:37
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VeltinsHello 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
Options are not worth it—neither battery nor stove. Money is inexpensive, stoves are cozy; if you want one, why not. By the way, photovoltaic systems have no impact on heating capacity.
Ask your energy consultant for a heating load calculation. This should roughly match the output of your heating system. The standard unit according to DIN is kW.
Ask your energy consultant for a heating load calculation. This should roughly match the output of your heating system. The standard unit according to DIN is kW.
I am with @BeHaElJa and @wrobel.
A fireplace and stove are only worthwhile for the coziness.
Do you have photovoltaic panels or a solar thermal system on the roof? In combination with a heat pump, I would tend to prefer photovoltaic panels. However, whether it is cost-effective is often disputed.
The design of your heating system must be based on the heat load calculation. No one here in the forum can give you a general answer to that.
A fireplace and stove are only worthwhile for the coziness.
Do you have photovoltaic panels or a solar thermal system on the roof? In combination with a heat pump, I would tend to prefer photovoltaic panels. However, whether it is cost-effective is often disputed.
The design of your heating system must be based on the heat load calculation. No one here in the forum can give you a general answer to that.
Thank you for the feedback.
Yes, I had read the thread, but apart from some heated arguments, there was little constructive discussion. I had difficulty objectively identifying the pros and cons.
Sorry, I meant a photovoltaic system, of course. The combination would be a Nibe 750 with a photovoltaic system, or optionally a larger photovoltaic system with an inverter and battery. But you have to recoup the 12,000 EUR first. If you want to avoid fossil fuels like oil and gas and are aiming for KfW 40 standard insulation anyway, besides the exhaust air heat pump, are there other options that definitely should be considered?
Besides the supplemental heating for these systems, especially in winter, I also have some concerns about drafts and similar issues. Overall, there’s a lot of negative feedback, and the trend here seems to be heading in a similar direction.
Yes, I had read the thread, but apart from some heated arguments, there was little constructive discussion. I had difficulty objectively identifying the pros and cons.
Sorry, I meant a photovoltaic system, of course. The combination would be a Nibe 750 with a photovoltaic system, or optionally a larger photovoltaic system with an inverter and battery. But you have to recoup the 12,000 EUR first. If you want to avoid fossil fuels like oil and gas and are aiming for KfW 40 standard insulation anyway, besides the exhaust air heat pump, are there other options that definitely should be considered?
Besides the supplemental heating for these systems, especially in winter, I also have some concerns about drafts and similar issues. Overall, there’s a lot of negative feedback, and the trend here seems to be heading in a similar direction.
B
Bauexperte10 Feb 2016 13:13Veltins schrieb:
Photovoltaic system or alternatively a larger photovoltaic system, inverter, and battery. The 12,000 EUR must For 3.3 kWp?Regards, Bauexperte
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