ᐅ New Construction with a Granny Flat – Heating System and KfW Financing Questions
Created on: 10 Apr 2021 23:07
D
derBensch
Hello housebuilding friends,
Since I have a large thread with many questions, I will separate the individual questions. It was quite a surprise that we got a building plot.
A house construction is planned. New build according to KFW40+ standard (currently still undecided whether KFW55, 40, or 40+). Using the new KFW subsidy would cover the additional costs one-to-one.
Yesterday during planning, I learned that for the new build, I will get "2x air-to-air heat pump heating" installed. Since I can apply for the KFW subsidy twice, I need 2 heating systems. What sense does that make? Well, in the end, I will probably get the heating for the secondary apartment (SA) at no extra cost.
The house (timber frame prefab house) without a basement, spread across two levels. 160 sqm (1720 sq ft) main apartment, 65 sqm (700 sq ft) secondary apartment.
Ground floor – main apartment + secondary apartment and the utility room
Upper floor – remaining rooms like children's rooms
The builder has now planned a "small and a large air-to-air heat pump" in the utility room.
My plan is rather to switch to an air-to-water heat pump with underfloor heating (should I also install a ventilation system with exhaust air heat recovery at the same time?). But what is sensible for the secondary apartment? Use the air-to-air heat pump of the main apartment and also install underfloor heating there? Here in the forum, I often read about the Panasonic Geisha monoblock. Would that be an option? So many questions...
I am honestly overwhelmed and still at the beginning of sorting out all these topics for the new build. Since a photovoltaic system is mandatory for new builds, it should be sized accordingly.
Then I would rather go for KFW40 without battery and cover the entire roof with panels.
I’m not sure if this information is sufficient to make a meaningful statement.
Thanks everyone.
Best regards,
Ben
Since I have a large thread with many questions, I will separate the individual questions. It was quite a surprise that we got a building plot.
A house construction is planned. New build according to KFW40+ standard (currently still undecided whether KFW55, 40, or 40+). Using the new KFW subsidy would cover the additional costs one-to-one.
Yesterday during planning, I learned that for the new build, I will get "2x air-to-air heat pump heating" installed. Since I can apply for the KFW subsidy twice, I need 2 heating systems. What sense does that make? Well, in the end, I will probably get the heating for the secondary apartment (SA) at no extra cost.
The house (timber frame prefab house) without a basement, spread across two levels. 160 sqm (1720 sq ft) main apartment, 65 sqm (700 sq ft) secondary apartment.
Ground floor – main apartment + secondary apartment and the utility room
Upper floor – remaining rooms like children's rooms
The builder has now planned a "small and a large air-to-air heat pump" in the utility room.
My plan is rather to switch to an air-to-water heat pump with underfloor heating (should I also install a ventilation system with exhaust air heat recovery at the same time?). But what is sensible for the secondary apartment? Use the air-to-air heat pump of the main apartment and also install underfloor heating there? Here in the forum, I often read about the Panasonic Geisha monoblock. Would that be an option? So many questions...
I am honestly overwhelmed and still at the beginning of sorting out all these topics for the new build. Since a photovoltaic system is mandatory for new builds, it should be sized accordingly.
Then I would rather go for KFW40 without battery and cover the entire roof with panels.
I’m not sure if this information is sufficient to make a meaningful statement.
Thanks everyone.
Best regards,
Ben
derBensch schrieb:
I assume the photovoltaic system offered by Bien-Zenker powers both heating systems? It probably isn’t really sufficient.In any case, during winter you’ll always need to buy electricity when the sun isn’t shining. And that happens quite often ;-)Oh, and in summer, when the sun is out, you don’t need heating (or just a little for hot water).