Happy Easter everyone.
We are building a two-story city villa with approximately 200 square meters (2,150 square feet) of living space. It will include three bathrooms in total (main bathroom with a bathtub, a children’s shower bathroom, and a guest toilet). We are building to the KfW 55 energy efficiency standard. Starting mid-year, there will be three of us, and a fourth pair of feet is already being planned in our minds.
The developer offers an air-to-water heat pump, model Novelan LAD 7 CSD. A controlled residential ventilation system is already planned.
However, I would like to discuss a different concept with you: gas condensing boiler combined with solar thermal, a large buffer tank, and a fireplace or pellet stove with a water jacket.
My idea is this: I consider solar thermal to be reasonable. Even with an air-to-water heat pump, I would add solar thermal. So having a large buffer tank would already be relevant for us. We also want to have a fireplace or pellet stove in the living room anyway. The additional cost for the water-heated version would therefore be completely acceptable.
I do not want to debate the general pros and cons of air-to-water heat pumps compared to a gas condensing boiler, but rather open my concept for discussion. Do you have any ideas or suggestions for me?
We are building a two-story city villa with approximately 200 square meters (2,150 square feet) of living space. It will include three bathrooms in total (main bathroom with a bathtub, a children’s shower bathroom, and a guest toilet). We are building to the KfW 55 energy efficiency standard. Starting mid-year, there will be three of us, and a fourth pair of feet is already being planned in our minds.
The developer offers an air-to-water heat pump, model Novelan LAD 7 CSD. A controlled residential ventilation system is already planned.
However, I would like to discuss a different concept with you: gas condensing boiler combined with solar thermal, a large buffer tank, and a fireplace or pellet stove with a water jacket.
My idea is this: I consider solar thermal to be reasonable. Even with an air-to-water heat pump, I would add solar thermal. So having a large buffer tank would already be relevant for us. We also want to have a fireplace or pellet stove in the living room anyway. The additional cost for the water-heated version would therefore be completely acceptable.
I do not want to debate the general pros and cons of air-to-water heat pumps compared to a gas condensing boiler, but rather open my concept for discussion. Do you have any ideas or suggestions for me?
B
Baumfachmann1 Apr 2018 15:12A gas condensing boiler is solid technology. If it ever breaks down, the replacement costs are far less than those for an air-to-water heat pump. A mechanical ventilation system with heat recovery, combined with a chimney, is also a good solution.
Baumfachmann schrieb:
A gas condensing boiler is a reliable technology. When it eventually needs replacing, the cost will be far less than that of an air-to-water heat pump...and I thought this wasn’t supposed to be about fundamental debates [emoji849]I am not an expert in heating technology, but here are a few general thoughts that often come up in similar discussions.
- A buffer tank is never really "worth it" financially. Whether that matters to you, I don’t know. The "acceptable extra cost" should be based on a specific offer or your assumption that "all necessary components are already in place."
- Solar thermal systems and heat pumps require at least considerable planning effort, as one operates with low temperatures and the other with high temperatures.
- When it comes to the size of the hot water storage tank, the concern is less about space and more about the energy required for hygienic operation, meaning regular reheating to prevent microbial growth.
PS: Our heating choice has not been finalized yet; the preference would be a brine-to-water heat pump. However, if we go with gas, I will try to avoid using solar thermal. Our current solar thermal system has caused nothing but problems for years.
- A buffer tank is never really "worth it" financially. Whether that matters to you, I don’t know. The "acceptable extra cost" should be based on a specific offer or your assumption that "all necessary components are already in place."
- Solar thermal systems and heat pumps require at least considerable planning effort, as one operates with low temperatures and the other with high temperatures.
- When it comes to the size of the hot water storage tank, the concern is less about space and more about the energy required for hygienic operation, meaning regular reheating to prevent microbial growth.
PS: Our heating choice has not been finalized yet; the preference would be a brine-to-water heat pump. However, if we go with gas, I will try to avoid using solar thermal. Our current solar thermal system has caused nothing but problems for years.
Fuchur schrieb:
- A water buffer tank is never really "worth it" economically. Whether that matters to you, I don’t know. The "acceptable extra cost" is based on a concrete offer or your assumption that all the necessary components are already in place?It is actually based on the assumption that all the necessary components are already there.
Fuchur schrieb:
- Solar thermal systems and heat pumps require at least significant planning effort, because one operates at low temperature, the other at high temperature.Good point. Thanks.
Fuchur schrieb:
- Regarding the size of the hot water storage tank, it is less about the space needed and more about the energy required to ensure hygienic operation, meaning regular reheating.That’s true. However, regular reheating is not too difficult to manage in my concept, since the solar thermal system and the buffer tank regularly provide enough hot water.
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