Geothermal heat pump, solar, and fireplace as heating?

Hello everyone,

after informing myself now I am completely unsure

Call to the developer came back with the statement: We first have to do a heat demand calculation, but basically 0.035 W/m² must be calculated

Call to the manufacturer:
The heat pump delivers 3 to 3.5 KW (demand is approximately 4.5 KW for 136 m² - no basement) and should be realizable through heat recovery and the entire technology.
We have already thought about laying tiles everywhere - they should also bring a few more watts.

A friend of mine said that with his natural gas he is at about 1000 euros per year for a three-family house. I am now wondering whether we should rather switch to a gas boiler + solar package and only use the underfloor heating.

Theoretically, the 3 KW brine heat pump with supply/ventilation + fireplace is totally enough...

or not?

Help!

Regards,

Haunt

Edit:

According to the manufacturer, the brine/water heat pump has 3.5 KW and the heating rod 2 KW and that should also be enough for an external water tank...

...after I have now informed myself I am completely confused

A really bad starting point!

...We first have to make a heat demand calculation, but basically 0.035 W/m² should be calculated

Well, there seems to be quite a bit wrong. Demand means energy (kWh), power means kW!

...The heat pump delivers 3 to 3.5 KW (demand is about 4.5 KW for 136 m² - no basement) and should be feasible through heat recovery and the entire technology.

How do you think a judge would evaluate "should"?

...We had already considered laying tiles everywhere - they are supposed to bring a few watts more.

How should that be physically possible?

...Theoretically the 3 KW brine heat pump with ventilation + chimney is completely sufficient...

Did the heating load calculation including the thermally effective air volume flows result in 3 kW? Which brine heat pump has a heating capacity of 3 kW? Please provide the manufacturer data! Also, a brine heat pump must manage without an electric heater! Is domestic hot water preparation taken into account?

...Help!

You urgently need it, otherwise you are building a money pit!

Kind regards

You urgently need this, otherwise you are tinkering with a money pit!

I'm already considering switching back to gas...

But first, thanks for the response!

I would like to understand:

So, according to the manufacturer

First the brine heat pump:
Type Item number Power (kW) B0/W35 Heating element (kW)
JVP3 740023 3.5 2.0

This is a complete package Nilan JVP 3 Compact

Then there is the ventilation system:
- Heat transfer capacity depending on air volume: up to approx. 2 kW

All of this looks good to me so far. We want to build a Kfw 70 house.

According to my calculation, we have a demand of approx. 4.7 (apples, pears, bananas) and the complete system delivers 3.5 (power) + 2 (heating element) + approx. 2 (heat recovery)

Plus the underfloor heating with tiles and without a basement.

What I was able to research so far should not be bad. But these are more or less the statements from the manufacturers

I have now entered the term "energy consultant" in the Yellow Pages...

Did the heating load calculation considering the thermally effective air volume flows result in 3 kW?

Have I already mentioned that I am a layman?

...Did I already mention that I am a layman?

That is not necessary, as it is clearly recognizable.

...First the brine-water heat pump:
Type Article number Power (kW) B0/W35 Heating element (kW)
JVP3 740023 3.5 2.0

As already mentioned, if the heating load ≤ 3.5 kW, that might be possible. However, there will likely be significant problems with the domestic hot water production.

...
Additionally, there is the ventilation system:
- Heat transfer capacity depending on air volume: up to approx. 2 kW

What is heat transfer capacity? Advertising? 2 kW is already extremely high. How should that be realized in a single-family house?

...The whole thing looks good to me for now. We want to build a KfW 70 house.

Well then, my condolences!

...According to my calculation, we have a demand of approx. 4.7 ( apples, pears, bananas ) and the entire system delivers 3.5 ( power ) + 2 ( heating element ) + approx. 2 ( heat recovery )

Well, I would think again. Own calculation, saving money on accurate sizing? Good luck with the cheap stuff!

Best regards.

I think we are talking past each other.

This is just roughly breaking it down whether this could work that way!

Own calculation, saving money for an exact dimensioning?

On Thursday I'm meeting with the developer to discuss everything with him. This pump was listed as an option for the house. We are building basically turnkey.
The exact dimensioning will come later – am I one step too early to start worrying about the heating?

Well, then my condolences!

Why is that?

Best regards,

haunt

....On Thursday I have an appointment with the developer to discuss everything with him. This pump was listed as the option for the house.

Presumably, I find it difficult to put myself in the position of a layperson. How can this or any other heat pump be an option if no heating load calculation is available? Absolutely illogical.
A proper plan looks something like this:

....The exact sizing is still to follow - am I starting to worry about the heating too early now?

You can never start early enough.

Best regards.