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.Hotzenplotz30 Mar 2018 20:40Nordlys schrieb:
Are you the property owner, or is this a developer project?I am the property owner.
So the thermal insulation certificate definitely needs to be submitted by now, correct?
Of course. Do you have your building permit / planning permission? Do you remember that the application requires confirming compliance with the energy saving ordinance? Are you aware that this confirmation must be supported by calculations, which have to be submitted to the building authority upon request? Therefore, these calculations must be available both with the authorities and with you.
R
R.Hotzenplotz30 Mar 2018 21:15For the thermal insulation certificate, it says "will be submitted before construction begins."
R.Hotzenplotz schrieb:
The general contractor does not provide any calculations. The architect once sent me the heating load calculation and mentioned that he had trouble with his superiors because an energy consultant found a suspected error in it, which I then passed on.
In principle, I am convinced that building with a general contractor was the right choice; however, when it comes to heating and building services, you definitely encounter the disadvantages of this model.As a strong advocate and committed supporter of building with an architect, I must say that this doesn’t necessarily have to be an issue with the general contractor model. A highly questionable culture regarding errors can be found frequently in other trades and also among architects (in the latter case, I am NOT speaking from experience, as I am still fully confident that I chose the right one). Instead of being grateful that the error was identified early and considerable costs and trouble were avoided afterward, the reaction is completely incomprehensible. Well, self-righteous idiots exist everywhere—across all industries. [emoji6]
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R.Hotzenplotz30 Mar 2018 21:33Regarding the thermal insulation verification. I would assume that it will only be prepared once I approve this "construction" now.
The thermal insulation certificate did not have to be submitted at the building permit stage in our case either. It was provided comfortably about six months later and is still subject to changes that occur during construction (specifically: two sandwich exposed concrete walls were replaced by masonry because the prefabricated elements have a two-month delivery time). I believe it’s not as strict as it’s often made out to be. However, once the building is erected, you should be able to present the certificate.
How such a document formally looks and whether a general contractor is obliged to hand over these planning documents is unclear. Intuitively, I would assume that all plans related to the construction (working drawings, heating load calculation, etc.) eventually become the property of the builder/client.
That this does not happen automatically or as naturally as one might expect was demonstrated to us by an expert who once reviewed a “Stadt und Land” contract for us and strongly recommended including a clause to ensure this handover. He must have had his reasons and experience for making that suggestion...
How such a document formally looks and whether a general contractor is obliged to hand over these planning documents is unclear. Intuitively, I would assume that all plans related to the construction (working drawings, heating load calculation, etc.) eventually become the property of the builder/client.
That this does not happen automatically or as naturally as one might expect was demonstrated to us by an expert who once reviewed a “Stadt und Land” contract for us and strongly recommended including a clause to ensure this handover. He must have had his reasons and experience for making that suggestion...
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