Dear forum members,
I am new here and, to be honest, I haven’t read all the previous posts yet, so a similar topic might already be discussed.
We are a family with three small children and are fortunate to be allowed to build in our hometown near Regensburg. In 2011, we built a small 145 sqm (1,560 sq ft) Tuscan-style house, but unfortunately, it no longer meets our needs, so we are planning to build again. Our current home is heated with a groundwater heat pump including cooling (which we rarely use). Overall, we are satisfied with the heating results, although on cold winter days, I miss the comfortable “warm feet feeling” that I have experienced with friends who have pellet or gas heating. What bothers me more is that our hot water takes quite a while to heat up and only reaches a temperature where I can still comfortably keep my hand under it.
We are considering a pellet heating system, but to be honest, we haven’t really researched heating systems at all yet—and a lot has probably changed in the last eight years. Our architect has proposed a compact heat pump with a central ventilation system and hot water storage, as this would likely be cheaper than a pellet system with central ventilation. However, for the heat pump, we definitely do not want an outdoor unit. An indoor installation might be possible, but we have concerns about the noise.
Is a central ventilation system really necessary or required? Currently, we have a decentralized ventilation system, which works well overall, but I am quite bothered by the plastic covers inside, which have yellowed over time.
What are your experiences? Ventilation—yes or no?
Heating—pellet, compact unit, or something else?
Thank you very much!
Best regards, Stefanie
I am new here and, to be honest, I haven’t read all the previous posts yet, so a similar topic might already be discussed.
We are a family with three small children and are fortunate to be allowed to build in our hometown near Regensburg. In 2011, we built a small 145 sqm (1,560 sq ft) Tuscan-style house, but unfortunately, it no longer meets our needs, so we are planning to build again. Our current home is heated with a groundwater heat pump including cooling (which we rarely use). Overall, we are satisfied with the heating results, although on cold winter days, I miss the comfortable “warm feet feeling” that I have experienced with friends who have pellet or gas heating. What bothers me more is that our hot water takes quite a while to heat up and only reaches a temperature where I can still comfortably keep my hand under it.
We are considering a pellet heating system, but to be honest, we haven’t really researched heating systems at all yet—and a lot has probably changed in the last eight years. Our architect has proposed a compact heat pump with a central ventilation system and hot water storage, as this would likely be cheaper than a pellet system with central ventilation. However, for the heat pump, we definitely do not want an outdoor unit. An indoor installation might be possible, but we have concerns about the noise.
Is a central ventilation system really necessary or required? Currently, we have a decentralized ventilation system, which works well overall, but I am quite bothered by the plastic covers inside, which have yellowed over time.
What are your experiences? Ventilation—yes or no?
Heating—pellet, compact unit, or something else?
Thank you very much!
Best regards, Stefanie
thimHH schrieb:
(2930 reference minus 2108 supply) for electricity, water, and heating. Are you sure about those numbers? For two people without heating, you would normally estimate between 2500-3000 kWh per year. The mechanical ventilation system alone will consume around 100 kWh, and with a buffer on the underfloor heating you even have an efficiency reducer. We use 6000 kWh total (50/50 split between general use and heating) with a significantly smaller house of 160 m² (1700 ft²). It is only KfW 55 standard and 24°C (75°F) in at least one-third of the house, but we also have an air-to-water heat pump with an annual performance factor close to 4.5.
B
boxandroof30 Jun 2019 23:16A 2900 kWh electricity consumption plus direct and battery self-consumption now doesn’t seem unrealistic to me.
We had 3800 kWh without photovoltaic. 2000 kWh household, 1400 kWh heat pump, 350 kWh controlled mechanical ventilation.
You’re also warmer in winter than thimHH in midsummer.
We had 3800 kWh without photovoltaic. 2000 kWh household, 1400 kWh heat pump, 350 kWh controlled mechanical ventilation.
You’re also warmer in winter than thimHH in midsummer.
The photovoltaic system covers the rest of our electricity needs. Even in our previous apartment, two people only used about 980 kWh of electricity per year. Apart from a significantly larger refrigerator, a bit more lighting, a Wi-Fi repeater, and a robotic lawn mower, nothing else has been added. The buffer tank connected to the air-source heat pump ensures that it operates very steadily in inverter mode during winter. We chose the smallest air-source heat pump in the series to keep it running at an optimal point. The ventilation system consumes about 250 kWh per year. The photovoltaic inverter’s standby power consumption is also notable. However, the photovoltaic system generated 3,700 kWh (after storage, including feed-in), which fits well with the design considering the orientation, tilt, and limitations due to KfW funding. We live here with three adults. Of course, there can be long discussions about whether this is economically worthwhile for me, but environmental protection doesn’t come for free, and the remaining electricity we need is purchased from hydropower. I expect household electricity consumption to increase somewhat next year with children, but I’m not worried. I’m more concerned about a long, cold, dark winter...
boxandroof schrieb:
and battery self-consumptionAh, that is included with KFW 40+, I hadn’t considered that.boxandroof schrieb:
2900 kWh electricity consumption plus direct and battery self-consumption doesn’t seem unrealistic to me.
We had 3800 kWh without photovoltaics. 2000 kWh for household use, 1400 kWh for the heat pump, 350 kWh for the controlled residential ventilation system.
You also keep it warmer in winter than thimHH does in midsummer. 1400 kWh for the heat pump per year? Isn’t that extremely low? That would mean less than 300 Euros in heating costs per year. I estimate two to three times that amount, but it would be good if it’s less.
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boxandroof1 Jul 2019 10:48Yes, it is very low. We already optimized a lot during construction and don’t heat excessively, plus the winter was mild. The coefficient of performance is just above 5; the heat pump is performing better than expected.
This shouldn’t be a benchmark for others, though—I had estimated around 2,000 kWh before building.
€300 isn’t quite accurate; we don’t have a special heat pump tariff and pay expensive green electricity, but we will finally have the photovoltaic system soon.
This shouldn’t be a benchmark for others, though—I had estimated around 2,000 kWh before building.
€300 isn’t quite accurate; we don’t have a special heat pump tariff and pay expensive green electricity, but we will finally have the photovoltaic system soon.
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