Dear heat pump experts and experienced home builders,
I would like to better understand what heat pump capacity we actually need.
Our project:
2 full floors
No basement
148 sqm (1,593 sq ft)
KFW55 standard
In our energy demand calculation, a 6 kW air-to-water heat pump is recommended.
However, the heating load calculation in the plan specifies an 8 kW air-to-air heat pump.
Both calculations seem to follow a standard procedure, as this is a developer project.
Which figures in both documents should I focus on?
To me, 8 kW seems quite high, but this is just a feeling formed by reading here in the forum.
The underfloor heating is already installed, also standard, and the screed has been curing for 4 weeks, waiting for the system to be heated up.
But there is no heat pump installed yet.
The builder would credit us €15,000 if we handle the purchase and installation of the heat pump ourselves.
All these questions are overwhelming us.
Is this even possible? Can we choose a different model or manufacturer?
Is it worthwhile, is €15,000 a reasonable amount?
Is 6 kW enough? ...
We need solid information to stand our ground with the builder.
Help!
Thanks!
I would like to better understand what heat pump capacity we actually need.
Our project:
2 full floors
No basement
148 sqm (1,593 sq ft)
KFW55 standard
In our energy demand calculation, a 6 kW air-to-water heat pump is recommended.
However, the heating load calculation in the plan specifies an 8 kW air-to-air heat pump.
Both calculations seem to follow a standard procedure, as this is a developer project.
Which figures in both documents should I focus on?
To me, 8 kW seems quite high, but this is just a feeling formed by reading here in the forum.
The underfloor heating is already installed, also standard, and the screed has been curing for 4 weeks, waiting for the system to be heated up.
But there is no heat pump installed yet.
The builder would credit us €15,000 if we handle the purchase and installation of the heat pump ourselves.
All these questions are overwhelming us.
Is this even possible? Can we choose a different model or manufacturer?
Is it worthwhile, is €15,000 a reasonable amount?
Is 6 kW enough? ...
We need solid information to stand our ground with the builder.
Help!
Thanks!
@face26
I actually agree with you completely, but
this here
is not always true. In the case of the Vaillant Arotherm, it is located in the Unitower. However, it should be noted that the Unitower is not only a storage tank but also partially controls the actual monoblock heat pump, which, by the way, can operate both monovalently and bivalently.
In this respect, @parcus’s description is misleading anyway. There are not only monovalent or bivalent heat pumps. Maybe some exist, but there are definitely many that can do both. I would even go so far as to say that among the heat pumps sized for single-family homes, those capable of both modes dominate, and it’s all just a matter of configuration. So it is more of an operating mode than a type of heat pump.
I actually agree with you completely, but
this here
face26 schrieb:
which, by the way, is integrated into the heat pump and not in the storage tank, maybe that’s your misunderstanding
is not always true. In the case of the Vaillant Arotherm, it is located in the Unitower. However, it should be noted that the Unitower is not only a storage tank but also partially controls the actual monoblock heat pump, which, by the way, can operate both monovalently and bivalently.
In this respect, @parcus’s description is misleading anyway. There are not only monovalent or bivalent heat pumps. Maybe some exist, but there are definitely many that can do both. I would even go so far as to say that among the heat pumps sized for single-family homes, those capable of both modes dominate, and it’s all just a matter of configuration. So it is more of an operating mode than a type of heat pump.
Daniel-Sp no problem, you probably won’t be doing any HVAC calculations either,...
Alessandro
Techn_FAQ point 2.03
For a KfW Efficiency House 55 based on reference values, there is a requirement to install a ventilation system in the building. This also applies, for example, to the installation of centralized ventilation systems for apartments in a multi-family building, which therefore must be installed in at least all apartments.
Alessandro
Techn_FAQ point 2.03
For a KfW Efficiency House 55 based on reference values, there is a requirement to install a ventilation system in the building. This also applies, for example, to the installation of centralized ventilation systems for apartments in a multi-family building, which therefore must be installed in at least all apartments.
Tolentino schrieb:
In the Vaillant arotherm system, it is located in the unit tower. However, it should be noted that the unit tower is not just a storage tank but also partially controls the actual monoblock heat pump, which can operate both monovalently and bivalently.Yes, my previous explanation was not complete. This, of course, depends on the model. I wanted to clarify that this is not a separately installed electric heating element used to keep the water warm all the time. Rather, it serves as a backup and is usually integrated as part of the system.
parcus schrieb:
For a KfW Efficiency House 55 based on reference values ....This is the alternative verification method. It requires fewer calculations and it is sufficient to meet the reference values.
With the calculated verification of meeting the requirements, a ventilation system is not necessary.
...I give up because I’m no longer interested. Maybe someone else wants to take over...
Just want to point out for everyone following this thread or returning to it later, that in my opinion @parcus is writing completely incorrect information.
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