Hello,
We are starting to get really frustrated... every builder tells us something different...
We want to build a 130sqm (1,399 sq ft) KfW 70 house with the living room facing south, and we are unsure whether to choose gas or an air source heat pump. Some providers, at almost the same price level, offer us air source heat pumps and claim that the annual costs are significantly (30%) lower compared to gas, while others doubt this.
We understand that insulation with gas/solar systems is usually better because an air source heat pump boosts efficiency more towards KfW 70 standards compared to gas/solar, which might argue in favor of gas. An air source heat pump might fail somewhat sooner, and in case of problems, you can usually get quick and competent local support with gas. With air source heat pumps, there could be more difficulties. Additionally, the noise of air source heat pumps (in our case about 3 meters (10 feet) from the neighbor) is not insignificant. Some say that sooner or later, everyone ends up having issues with neighbors for this reason.
We are interested in air source heat pumps with storage tanks from these providers: Vaillant, Mitsubishi Zubadan, and Rotex.
What we are really curious about is the annual cost for heating and hot water with both systems.
We live near Kassel.
What should we choose, and what would be cost-effective TODAY? What is your opinion on Vaillant?
Regards
Gigi
We are starting to get really frustrated... every builder tells us something different...
We want to build a 130sqm (1,399 sq ft) KfW 70 house with the living room facing south, and we are unsure whether to choose gas or an air source heat pump. Some providers, at almost the same price level, offer us air source heat pumps and claim that the annual costs are significantly (30%) lower compared to gas, while others doubt this.
We understand that insulation with gas/solar systems is usually better because an air source heat pump boosts efficiency more towards KfW 70 standards compared to gas/solar, which might argue in favor of gas. An air source heat pump might fail somewhat sooner, and in case of problems, you can usually get quick and competent local support with gas. With air source heat pumps, there could be more difficulties. Additionally, the noise of air source heat pumps (in our case about 3 meters (10 feet) from the neighbor) is not insignificant. Some say that sooner or later, everyone ends up having issues with neighbors for this reason.
We are interested in air source heat pumps with storage tanks from these providers: Vaillant, Mitsubishi Zubadan, and Rotex.
What we are really curious about is the annual cost for heating and hot water with both systems.
We live near Kassel.
What should we choose, and what would be cost-effective TODAY? What is your opinion on Vaillant?
Regards
Gigi
R
R.Hotzenplotz11 Mar 2018 12:04Steel is actually both.
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R.Hotzenplotz11 Mar 2018 12:10And by "steel tank like any other," you meant the first option, correct?
R
R.Hotzenplotz22 Mar 2018 09:46Just received some information that they now see the solar solution as problematic because the roof only has a 15° pitch. The collectors would have to be angled, so they couldn’t be installed flush with the roof. They say this doesn’t look good visually, and last week they had a client with a flat roof where such an installation was confirmed to be affected by storms.
They then wanted to offer a tube-type solution, but that would only be feasible with a gravel ballast system. I said that won’t work because our roof requires roof tiles; it’s not a flat roof that can be covered with gravel.
They are now reconsidering and want to discuss alternatives. Maybe they still want to steer me toward a brine heat pump.
I’ll have to see if I can find pictures of solar systems on 15° hipped roofs. Before it becomes a technical or visual disaster, that would naturally be worth serious consideration.
They then wanted to offer a tube-type solution, but that would only be feasible with a gravel ballast system. I said that won’t work because our roof requires roof tiles; it’s not a flat roof that can be covered with gravel.
They are now reconsidering and want to discuss alternatives. Maybe they still want to steer me toward a brine heat pump.
I’ll have to see if I can find pictures of solar systems on 15° hipped roofs. Before it becomes a technical or visual disaster, that would naturally be worth serious consideration.
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