ᐅ Which heating system is suitable for a newly built KfW 70 house?
Created on: 5 Aug 2013 23:08
D
deus77
We are planning to build a new KfW 70 house and are unsure which heating system to install.
Basic parameters:
Living area 150 sqm (1600 sq ft)
Single-story, underfloor heating, electric shutters
Concept:
To be independent from gas or oil, we want to use an air-source heat pump (ground-source heat is significantly more expensive), combined with solar thermal panels of about 6 sqm (65 sq ft) optimally facing south. Additionally, we are considering a water-connected wood stove to be able to heat with wood as a backup if necessary. Possibly, we will also install solar panels facing west to generate electricity (for the air-source heat pump and general self-consumption).
Of course, the initial costs are quite substantial. With a “normal” calculation from today’s point in time, it will take many years for the investment to pay off. If a loan is taken for this and repaid little by little (with interest!), it becomes more complex. However, we believe that raw material prices for gas and oil will rise significantly over the next years. Electricity prices too, which is why we consider the additional solar panels for self-consumption. Fortunately, due to an inheritance, we have enough cash to pay for the entire project upfront (no loan!). However, nobody has been able to provide us with a suitable cost-benefit analysis so far. Does this make sense, or are we getting carried away?
A builder friend advises us to install a good gas heating system with solar thermal panels. The house is very well insulated, so that should be sufficient. Plus a simple wood stove, and that’s about it...
I would appreciate hearing a few opinions here… The project might start this year.
Thank you and best regards
Tom
Basic parameters:
Living area 150 sqm (1600 sq ft)
Single-story, underfloor heating, electric shutters
Concept:
To be independent from gas or oil, we want to use an air-source heat pump (ground-source heat is significantly more expensive), combined with solar thermal panels of about 6 sqm (65 sq ft) optimally facing south. Additionally, we are considering a water-connected wood stove to be able to heat with wood as a backup if necessary. Possibly, we will also install solar panels facing west to generate electricity (for the air-source heat pump and general self-consumption).
Of course, the initial costs are quite substantial. With a “normal” calculation from today’s point in time, it will take many years for the investment to pay off. If a loan is taken for this and repaid little by little (with interest!), it becomes more complex. However, we believe that raw material prices for gas and oil will rise significantly over the next years. Electricity prices too, which is why we consider the additional solar panels for self-consumption. Fortunately, due to an inheritance, we have enough cash to pay for the entire project upfront (no loan!). However, nobody has been able to provide us with a suitable cost-benefit analysis so far. Does this make sense, or are we getting carried away?
A builder friend advises us to install a good gas heating system with solar thermal panels. The house is very well insulated, so that should be sufficient. Plus a simple wood stove, and that’s about it...
I would appreciate hearing a few opinions here… The project might start this year.
Thank you and best regards
Tom
Erik_IEU schrieb:
....And here the proposed gas condensing boiler combined with solar thermal energy ... It seems more like wishful thinking by the father ;-)Gas condensing boilers are not bad, but the investment is comparable to, for example, an air heat pump. Unfortunately, you cannot use it for cooling, but you can for cooking.
To meet external regulations, it is usually necessary to additionally include a solar thermal system, which is often uneconomical for a single-family house!
Now the reader can decide which solution to choose based on the demand balance (capacity, energy) ;-)
Best regards