ᐅ KfW 40+ Subsidy with Photovoltaic System and Ventilation Unit
Created on: 30 Mar 2021 04:39
T
Thomas W.
Hello everyone,
We are currently deciding which efficiency class to choose for our build.
It will be a prefabricated house with 150 sqm (1,615 sq ft) including a fireplace, for 2 adults and 2 children, equipped with an air-to-water heat pump from Stiebel Eltron (probably the LWZ 5 S).
The heating system will be provided by the prefabricated house manufacturer.
For the KfW subsidy, we received the following offer:
(Insulation is excluded)
Air-to-water heat pump + ventilation
16.37 sqm (176 sq ft) photovoltaic system on the house (9 modules each 390 Wp, 3.51 kWp south-facing attic roof)
Usable battery capacity 2.6 kWh
Manufacturer: BYD Premium HVS 5.1
Unfortunately, I have read a lot of negative feedback about ventilation systems and am quite hesitant.
Also, I see a lot of information about photovoltaic systems with many modules and a small battery.
The total package (photovoltaics + ventilation) would cost me 21,000 €.
Could you please help me?
Does this option make sense, and can I upgrade or improve the system later?
I want to be very cautious as I am not very familiar with this topic.
I would appreciate any answers.
We are currently deciding which efficiency class to choose for our build.
It will be a prefabricated house with 150 sqm (1,615 sq ft) including a fireplace, for 2 adults and 2 children, equipped with an air-to-water heat pump from Stiebel Eltron (probably the LWZ 5 S).
The heating system will be provided by the prefabricated house manufacturer.
For the KfW subsidy, we received the following offer:
(Insulation is excluded)
Air-to-water heat pump + ventilation
16.37 sqm (176 sq ft) photovoltaic system on the house (9 modules each 390 Wp, 3.51 kWp south-facing attic roof)
Usable battery capacity 2.6 kWh
Manufacturer: BYD Premium HVS 5.1
Unfortunately, I have read a lot of negative feedback about ventilation systems and am quite hesitant.
Also, I see a lot of information about photovoltaic systems with many modules and a small battery.
The total package (photovoltaics + ventilation) would cost me 21,000 €.
Could you please help me?
Does this option make sense, and can I upgrade or improve the system later?
I want to be very cautious as I am not very familiar with this topic.
I would appreciate any answers.
T
Thomas W.30 Mar 2021 13:09nordanney schrieb:
First, the air is always dry in winter (even without controlled ventilation systems), and secondly, you can also choose a variant with humidity recovery.
Bacteria develop in moisture. But you yourself write that the air feels too dry to you. You have to make up your mind. You can’t have both ;-)
Aside from that, the systems don’t get “clogged” if you maintain them properly (regularly changing the filters). Thanks for the answers.
Of course, with regular filter changes, this won’t happen.
We were offered a decentralized system. If I understand correctly, the rooms can be controlled individually?
Thomas W. schrieb:
We were offered a decentralized system. If I understand correctly, are the rooms individually controllable?Plot. Yes. However, there are also interconnected systems available.F
freithelm10 May 2021 23:47We are currently deciding whether to aim for KfW 40 (plus) or just 55. From an economic standpoint, the architect recommended an efficient condensing boiler (including solar thermal). Also, since the gas line needs to be installed anyway because of a gas fireplace.
However, I’m somewhat reluctant and would prefer to invest in a “future-proof” system. Being dependent on fossil fuels is not ideal. And if you power the heat pump with your own photovoltaic system, that’s quite efficient.
Heat pumps are also getting more affordable, right?
However, I’m somewhat reluctant and would prefer to invest in a “future-proof” system. Being dependent on fossil fuels is not ideal. And if you power the heat pump with your own photovoltaic system, that’s quite efficient.
Heat pumps are also getting more affordable, right?