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?
Mycraft schrieb:
The solar thermal system only provides hot water roughly from May to September.That’s something at least. It covers 5 out of 12 months of the year.
Mycraft schrieb:
The water jacket is absolutely useless at 55°C (131°F)... for it to be effective, the stove needs to deliver a significant amount of heat. But that contradicts the rest of the house concept.I don’t quite understand that. Since I want to have a wood stove anyway—mainly for design and comfort reasons—the step to adding a water jacket seems only a small one. In a house like this, I don’t need a stove to heat the room unless I want to do low-temperature cooking or open all the windows to heat the terrace.
wrobel schrieb:
Hello
Why do you need the gas boiler?
With a thermal solar system and buffer tank, the water-heated pellet stove should be sufficient.
You could then save the costs for the gas boiler, gas connection, and the basic meter fee.
OlliThe gas boiler is my main heating system. The stove – I currently prefer a wood log stove – is only intended to be used twice a week during the winter. Mainly for aesthetic and comfort reasons while sitting on the couch in the living room in the evening. I wanted to make good use of the fire’s energy in that setting.
I will need the gas connection anyway because of the kitchen.
Baraja schrieb:
The gas boiler is my main heating system. The stove – I currently prefer a wood-burning stove – is only meant to be used twice a week during the winter. Mainly for aesthetic and comfort reasons when sitting on the couch in the living room in the evening. If you remove the last sentence, it makes sense [emoji6] Seriously, how much “savings” do you expect with that usage pattern? A few cents per year? The water jackets and the buffer tank also cost money… but what really matters, in my opinion, is what MyCraft already said: it just doesn’t quite fit together conceptually.
K
Knallkörper2 Apr 2018 10:57The total costs for your maximum version are already substantial. You need to integrate three different energy sources with their respective temperature levels and require a very large storage tank, probably with several heat exchangers and one pump per energy source, plus likely a backup pump for the stove. Designing and controlling the system alone is probably beyond the expertise of many heating contractors. A wood stove is unlikely to pay for itself, whether it has a water jacket or not.
ruppsn schrieb:
Delete the last sentence and it makes sense [emoji6] Seriously, how much “savings” do you expect given your usage habits? A few cents per year? The water jackets and the buffer tank also cost money... but mainly, in my opinion, what MyCraft already wrote counts: it just doesn’t fit together conceptually.I slept on it, and the idea of “removing the last sentence” was a deal-breaker for my concept. With my usage pattern of the stove, I won’t achieve any significant gain for hot water production or heating.
I will rather go in the direction of a gas condensing boiler plus solar thermal with a sensible storage tank.
Wood stove for the look and comfort, possibly later.
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