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.Hotzenplotz6 Jan 2018 14:52Joedreck schrieb:
I don’t know at what stage you are or what else you have going on.The construction is about to start. The earthworks will probably begin in 1-2 weeks. Unfortunately, the heating load calculation arrived at the last minute and disrupted the original plan. Besides that, I have quite a lot on my plate. I enjoy doing research, but I won’t be doing any work myself. The idea of involving the digger operators is out of the question. I hire professional companies for everything.
Regarding the offered “air heat pump,” the manufacturer actually specifies it as an air-to-water heat pump. I’m still a bit confused whether it is a pure air heat pump or an air-to-water heat pump. The price difference compared to solar and gas systems also seems quite small. In typical example calculations, there is usually a difference of many thousands of euros in favor of gas and solar, but for me it’s only about €2,100 - €2,600.
The region is NRW.
I’m having it calculated. It’s actually ridiculous that I have to make this decision without any calculations. Of course, the detailed execution planning is pressing and it’s relevant for that (flue duct). Although it’s not my fault that the heating load calculation came late, I’m still the one to blame if this delays the construction.
What you said about the heating engineers, I also agree with. I’m now convinced in many areas that advice and purchase should be strictly separated.
Then the trench collector is not an option. If someone has to do that and it ends up involving excavation, the cost advantage is lost.
I do not recommend a pure air-source heat pump.
An air-to-water heat pump works well if you pay attention to a few things. It is important to choose a good device and to have the underfloor heating perfectly designed. Then an annual performance factor of 4 is achievable. That means 1 kWh of electricity produces 4 kWh of heat.
This eliminates the need for a borehole, the gas connection, and solar panels.
In my opinion, the air-to-water heat pump should be noticeably cheaper than gas and solar.
I do not recommend a pure air-source heat pump.
An air-to-water heat pump works well if you pay attention to a few things. It is important to choose a good device and to have the underfloor heating perfectly designed. Then an annual performance factor of 4 is achievable. That means 1 kWh of electricity produces 4 kWh of heat.
This eliminates the need for a borehole, the gas connection, and solar panels.
In my opinion, the air-to-water heat pump should be noticeably cheaper than gas and solar.
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