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
Baumfachmann15 Feb 2018 23:30Ground floor 90sqm (970 sq ft), upper floor 86sqm (925 sq ft), 1m (3 ft 3 in) knee wall, open roof, 4.60m (15 ft 1 in) ceiling height, KfW 40 standard, gas connection 2,150€. Controlled residential ventilation Zehnder with heat recovery.
Complete heating system 6,200€, Viessmann Vitodens.
Including basic fee 411€ in 2014, 392€ in 2015, 402€ in 2016. Maintenance 95€.
House price 258,000€, turnkey with premium finishes plus 18,000€ for the foundation slab.
Complete heating system 6,200€, Viessmann Vitodens.
Including basic fee 411€ in 2014, 392€ in 2015, 402€ in 2016. Maintenance 95€.
House price 258,000€, turnkey with premium finishes plus 18,000€ for the foundation slab.
R.Hotzenplotz schrieb:
Apparently, there are also subsidies for gas/solar systems.
Google Bafa
500 € (about 540 USD) for a solar collector system
It also mentions something about gas-driven heat pumps. What is that supposed to be? A regular gas boiler? There is a € 4,500 (about 4,860 USD) subsidy for that.The subsidy only applies to existing buildings (at least 2 years old). For new constructions, it only applies to large solar systems (for example, in multi-family houses).
R
R.Hotzenplotz10 Mar 2018 19:20We have now received feedback that we can install the originally proposed gas and solar solution. We will proceed with ordering that. We prefer this over experimenting with the ground-source heat pump. Especially since the underfloor heating is designed in a way that allows for a switch later if necessary. Although the drilling might be challenging then.
R
R.Hotzenplotz11 Mar 2018 11:40One more question:
The hot water storage tank offered was the Viessmann Vitocell-100B. It is made of steel with Ceraprotect enamel coating.
I saw on Viessmann’s website that there is also the Vitocell 300-B, which is made from corrosion-resistant stainless steel and is rust-free. Wouldn’t that be a better choice, or is it unnecessary in my case?
The hot water storage tank offered was the Viessmann Vitocell-100B. It is made of steel with Ceraprotect enamel coating.
I saw on Viessmann’s website that there is also the Vitocell 300-B, which is made from corrosion-resistant stainless steel and is rust-free. Wouldn’t that be a better choice, or is it unnecessary in my case?
That is certainly better. However, if you search online, you will find that the 300-B is already twice as expensive as the 100-B when bought online. For example, €2000 instead of €1000 for the 300-liter (79-gallon) model. In my opinion, that doesn't make sense.
The 300-B is available "only" up to 500 liters (132 gallons).
The 300-B is available "only" up to 500 liters (132 gallons).
R
R.Hotzenplotz11 Mar 2018 11:47How long does the non-stainless storage tank that was offered to me last? At some point, it will likely start to rust away.