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
B
Baumfachmann25 Jan 2018 21:56The heating costs were a joke. I’m happy to forgo any subsidies and don’t care about ecological concerns—the state doesn’t pay my bills, I do.
Nordlys schrieb:
Gas, solar, 108 sqm (1160 sq ft), only compliant with the basic Energy Saving Ordinance. E.On estimates our costs at $750 per year. I’ll see what it will actually be in September. The price was $5000 less than for an air-to-water heat pump.
Both offers are from Junkers.
Connection fee $750, which means a $4250 surcharge for the heat pump. Is it really worth it? I don’t think so. A warm room is a warm room. Both provide that. KarstenWhether it’s worth it can only be answered in twenty years. And the question then is more about how many kWh were actually used.
However, the underfloor heating should be properly designed anyway. Because even with gas, the boiler then runs more efficiently and, if needed, it can be switched to a heat pump in 20 years without any concerns.
Unfortunately, not many people are up to date with the latest technology and tend to avoid it. But that is another matter.
R
R.Hotzenplotz25 Jan 2018 22:22Joedreck schrieb:
But: the underfloor heating should be properly designed according to the requirements.How can this be verified? Is there a specific document that can be requested from the general contractor where this can be checked? It probably won't be the heating load calculation.
Yes, the room-by-room calculation must be done correctly. After that, the underfloor heating can be designed. Preferably according to your specifications. Speak with the energy consultant.
The supply temperature should not exceed 35°C (95°F). The individual circuits should be nearly the same length. No more than 100 meters (330 feet) per circuit. Use wall heating instead of bathroom radiators. Hydraulic balancing is essential.
The system should be well chosen. The builder must be knowledgeable about it, and the minimum output should be low. This prevents constant on/off cycling.
The supply temperature should not exceed 35°C (95°F). The individual circuits should be nearly the same length. No more than 100 meters (330 feet) per circuit. Use wall heating instead of bathroom radiators. Hydraulic balancing is essential.
The system should be well chosen. The builder must be knowledgeable about it, and the minimum output should be low. This prevents constant on/off cycling.
R
R.Hotzenplotz25 Jan 2018 22:30The general contractor doesn’t come across as very committed to me. They just sell their standard products and push those. They charge for what is required by regulations, but that’s about it.
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