ᐅ Operating Cost Statement for Heat Pump in a Secondary Apartment
Created on: 29 Apr 2019 13:11
T
titoz
Hello everyone,
I urgently need your input.
We have a single-family house with a granny flat (secondary apartment), which is rented out.
Heating and cooling are provided by a Nibe F1145PC (geothermal system).
We have the following meters:
- "regular" electricity (total)
- "regular" electricity (granny flat)
- total electricity for the heat pump
- cold water (total)
- cold water for the granny flat
- hot water for the granny flat
- heating, compressor only (from the heat pump)
- domestic hot water, compressor only (from the heat pump)
- heat, including internal auxiliary heating (electric heating element in the heat pump)
- domestic hot water, including internal auxiliary heating (from the heat pump)
- heat meter before the underfloor heating of the granny flat
Sorry, I just can’t make sense of this.
How can I simply but fairly calculate the utility costs in the future?
I was advised that everything could be legally disputed except for the allocation of the heat pump electricity costs based on the living area.
The problem seems to be the energy recovery, the cooling, and the varying efficiency of the heat pump depending on the brine temperature.
I’m also wondering how passive cooling is measured. How is that accounted for?
The installer says he has no experience with heat pumps.
Nibe customer service told me to contact Nibe directly.
Nibe themselves say they can’t provide any information on this.
So now what?
I’m grateful for any advice.
Best regards,
Tito
I urgently need your input.
We have a single-family house with a granny flat (secondary apartment), which is rented out.
Heating and cooling are provided by a Nibe F1145PC (geothermal system).
We have the following meters:
- "regular" electricity (total)
- "regular" electricity (granny flat)
- total electricity for the heat pump
- cold water (total)
- cold water for the granny flat
- hot water for the granny flat
- heating, compressor only (from the heat pump)
- domestic hot water, compressor only (from the heat pump)
- heat, including internal auxiliary heating (electric heating element in the heat pump)
- domestic hot water, including internal auxiliary heating (from the heat pump)
- heat meter before the underfloor heating of the granny flat
Sorry, I just can’t make sense of this.
How can I simply but fairly calculate the utility costs in the future?
I was advised that everything could be legally disputed except for the allocation of the heat pump electricity costs based on the living area.
The problem seems to be the energy recovery, the cooling, and the varying efficiency of the heat pump depending on the brine temperature.
I’m also wondering how passive cooling is measured. How is that accounted for?
The installer says he has no experience with heat pumps.
Nibe customer service told me to contact Nibe directly.
Nibe themselves say they can’t provide any information on this.
So now what?
I’m grateful for any advice.
Best regards,
Tito
It is also legally correct to allocate costs based on square meters. I recently confirmed this with my tax advisor. You are even allowed to bill the additional costs as a flat rate because the house has two separate living units.
However, I would also be interested in information about a washing machine meter for the second unit, although it is not relevant at the moment since my mother-in-law is living there. I just suspect that the costs are not insignificant.
However, I would also be interested in information about a washing machine meter for the second unit, although it is not relevant at the moment since my mother-in-law is living there. I just suspect that the costs are not insignificant.
Ok, so
Distribute electricity costs for the heat pump based on the living area. This includes hot water, underfloor heating, underfloor cooling, and the internal auxiliary heating using a heating rod (again for hot water and underfloor heating).
- Which area should I use? Just the covered living area or also the terraces, which count as 25-50% of the living area? That would be really unfair for me since I have a 100 m² (1,080 sq ft) rooftop terrace above the granny flat and garage.
You can’t allocate based on the number of people, right? Currently, there are 4 people living in the house with 150 m² (1,615 sq ft) and 3 people in the granny flat with 70 m² (750 sq ft). So that would be a big disadvantage for me, wouldn’t it?
Regarding cold water:
- Cold water comes in through the main meter. After that, cold water goes to the granny flat meter, to my house without a meter, and to the heat pump. So here, an exact billing wouldn’t be possible either. Would the consumption from the meter at the transfer point then have to be allocated based on area or number of occupants?
Thank you all for your support. Slowly, things are becoming clearer.
Distribute electricity costs for the heat pump based on the living area. This includes hot water, underfloor heating, underfloor cooling, and the internal auxiliary heating using a heating rod (again for hot water and underfloor heating).
- Which area should I use? Just the covered living area or also the terraces, which count as 25-50% of the living area? That would be really unfair for me since I have a 100 m² (1,080 sq ft) rooftop terrace above the granny flat and garage.
You can’t allocate based on the number of people, right? Currently, there are 4 people living in the house with 150 m² (1,615 sq ft) and 3 people in the granny flat with 70 m² (750 sq ft). So that would be a big disadvantage for me, wouldn’t it?
Regarding cold water:
- Cold water comes in through the main meter. After that, cold water goes to the granny flat meter, to my house without a meter, and to the heat pump. So here, an exact billing wouldn’t be possible either. Would the consumption from the meter at the transfer point then have to be allocated based on area or number of occupants?
Thank you all for your support. Slowly, things are becoming clearer.
You want it too exact. Hot water cannot be billed separately because you don’t know how much it costs in euros to heat it. For cold water, you just take the reading from the sub-meter water meter for the secondary apartment; that’s the maximum you can use.
Heat meters, if used, must be installed in every heating circuit, specifically at the beginning of the circuit. How the costs are then allocated is explained above. Karsten
PS why does cold water flow into the heat pump? No water flows into my gas heating system.
Heat meters, if used, must be installed in every heating circuit, specifically at the beginning of the circuit. How the costs are then allocated is explained above. Karsten
PS why does cold water flow into the heat pump? No water flows into my gas heating system.
H
HilfeHilfe30 Apr 2019 17:38Hello, as already mentioned, a heat meter. Otherwise, regarding hot water, we have the same issue. By law, you can allocate 35% of the electricity consumption to water heating. This means 65% of the electricity is for heating, which you divide according to the heat meter, and 35% for hot water consumption. The size of the apartment does not matter in this case.
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