ᐅ Heating system for a 400 sqm multi-family house with KfW 55 energy standard
Created on: 23 Apr 2018 17:42
L
Lückenfüller
Since our originally planned heating system (ground-source heat pump) literally fell through due to environmental authority regulations for the groundwater protection zone IIIa, we are now looking for alternatives but are still uncertain about the options.
Here are some basic details:
- The new building will be around 390sqm (14x14m, two apartments per full floor, two smaller apartments on the top recessed floor).
- We must build to KfW55 standard (requirement from the city).
- Estimated heating load about 16,000W/year
- Planned controlled residential ventilation system
We therefore see three alternatives:
- Gas & solar thermal: This will be very challenging to achieve within a KfW55 standard building and would need a more detailed calculation. Otherwise, it seems very attractive to us.
- Air-to-water heat pump: The mild climate in the Rhine area speaks in favor, as only little electric supplementary heating should be needed in winter. Against it is the large unit in the (front) garden, especially with the above-mentioned heat demand. Does anyone have experience with air-to-water heat pumps at this scale, possibly also with indoor installation?
- Well heat pump: This would be possible despite the groundwater protection zone, but an expert wants €750 for a test drilling to provide a reliable assessment.
- Trench collector is not an option since the plot is too small for it.
What would you recommend?
Here are some basic details:
- The new building will be around 390sqm (14x14m, two apartments per full floor, two smaller apartments on the top recessed floor).
- We must build to KfW55 standard (requirement from the city).
- Estimated heating load about 16,000W/year
- Planned controlled residential ventilation system
We therefore see three alternatives:
- Gas & solar thermal: This will be very challenging to achieve within a KfW55 standard building and would need a more detailed calculation. Otherwise, it seems very attractive to us.
- Air-to-water heat pump: The mild climate in the Rhine area speaks in favor, as only little electric supplementary heating should be needed in winter. Against it is the large unit in the (front) garden, especially with the above-mentioned heat demand. Does anyone have experience with air-to-water heat pumps at this scale, possibly also with indoor installation?
- Well heat pump: This would be possible despite the groundwater protection zone, but an expert wants €750 for a test drilling to provide a reliable assessment.
- Trench collector is not an option since the plot is too small for it.
What would you recommend?
S
sichtbeton824 May 2018 09:45Perhaps also a ground source heat pump combined with PVT (photovoltaic and solar thermal).
L
Lückenfüller4 May 2018 11:05At the moment, two favorites have emerged: Gas with controlled residential ventilation and solar thermal might actually be feasible, as well as the well heat pump.
For the latter, we will soon receive a quote from a company that has already installed one at a distance of 200m (650 feet).
@sichtbeton82: Thanks for your ideas. Unfortunately, our general contractors don’t seem very creative in this regard yet, or they haven’t installed these systems before. Intuitively, I would prefer to use something that at least our construction companies are familiar with.
For the latter, we will soon receive a quote from a company that has already installed one at a distance of 200m (650 feet).
@sichtbeton82: Thanks for your ideas. Unfortunately, our general contractors don’t seem very creative in this regard yet, or they haven’t installed these systems before. Intuitively, I would prefer to use something that at least our construction companies are familiar with.