Hello everyone,
I hope this topic is posted in the right section or generally appropriate for this forum. I am a new property manager and have a problem with the billing of electricity, water, and heating electricity. I have attached an image listing all the values. The building consists of 4 residential units (Unit 1 to Unit 4).
Can someone explain how to calculate the costs for each individual unit? Calculating the total water consumption cost is not an issue, but for example, electricity is needed to heat the water. However, there is no specific price per cubic meter for hot water. How should I calculate the electricity costs for heating the hot water for each unit?
Additionally, there is a general electricity meter connected to the heat pump, which supplies, for example, the corridor lighting or the bicycle storage room lighting.
How does this work for the electricity consumption of the electric auxiliary heater and compressor? This consumption is not reflected on the general electricity meter, which I would have expected. I am a bit confused here and might be missing something. Hopefully, someone can help me.
Thank you very much and best regards
I hope this topic is posted in the right section or generally appropriate for this forum. I am a new property manager and have a problem with the billing of electricity, water, and heating electricity. I have attached an image listing all the values. The building consists of 4 residential units (Unit 1 to Unit 4).
Can someone explain how to calculate the costs for each individual unit? Calculating the total water consumption cost is not an issue, but for example, electricity is needed to heat the water. However, there is no specific price per cubic meter for hot water. How should I calculate the electricity costs for heating the hot water for each unit?
Additionally, there is a general electricity meter connected to the heat pump, which supplies, for example, the corridor lighting or the bicycle storage room lighting.
How does this work for the electricity consumption of the electric auxiliary heater and compressor? This consumption is not reflected on the general electricity meter, which I would have expected. I am a bit confused here and might be missing something. Hopefully, someone can help me.
Thank you very much and best regards
H
HilfeHilfe27 Jan 2024 06:20Maybe a silly question, but how have you been billing the hot water so far?
schubert7927 Jan 2024 06:43Something is not right. The values do not match.
I have never done this before because this is a brand-new house, and I have never dealt with this in connection with a heat pump. I also don’t know anyone who is familiar with it. That’s why I’m hoping for your support in this forum.
Can you tell me which values don’t seem right to you and why? The total value for “heating” was incorrect. The rest should be accurate.
I have corrected it and attached it again.
Can you tell me which values don’t seem right to you and why? The total value for “heating” was incorrect. The rest should be accurate.
I have corrected it and attached it again.
So far, the values from the heat pump were much higher than those from the residential unit meters. But they likely had different starting points.
Now you have also updated the heat pump values below.
If you calculate the differences, they are at least in the same range.
So, first of all, definitely only take the difference values between the reading dates; that should be clear.
Then you have a total electricity consumption (electricity meter). First, subtract the sums of all the individual electricity meters and allocate accordingly to the residential units and common areas.
As the property manager, you probably know better than I do how to allocate the common areas.
The remaining electricity usage must be the consumption for heating and hot water. But you only have heat quantity meters.
So first, convert the heat energy share for hot water (from the heat pump value) into electricity. Then reduce this hot water electricity amount by the share of common hot water heat quantity in the total hot water heat quantity. This will give you the electricity amount for the commonly generated hot water portion.
Distribute the remaining hot water electricity amount according to the shares of the hot water cubic meter (m³) readings.
The remaining electricity amount should be for heating and can again be distributed according to the shares of the heat quantities on the individual meters.
This is how I would approach it. And as mentioned, you may need to allocate the fixed electricity charges differently.
Now you have also updated the heat pump values below.
If you calculate the differences, they are at least in the same range.
So, first of all, definitely only take the difference values between the reading dates; that should be clear.
Then you have a total electricity consumption (electricity meter). First, subtract the sums of all the individual electricity meters and allocate accordingly to the residential units and common areas.
As the property manager, you probably know better than I do how to allocate the common areas.
The remaining electricity usage must be the consumption for heating and hot water. But you only have heat quantity meters.
So first, convert the heat energy share for hot water (from the heat pump value) into electricity. Then reduce this hot water electricity amount by the share of common hot water heat quantity in the total hot water heat quantity. This will give you the electricity amount for the commonly generated hot water portion.
Distribute the remaining hot water electricity amount according to the shares of the hot water cubic meter (m³) readings.
The remaining electricity amount should be for heating and can again be distributed according to the shares of the heat quantities on the individual meters.
This is how I would approach it. And as mentioned, you may need to allocate the fixed electricity charges differently.
Thank you for the detailed response! The first part about the electricity meters and how I charge for that is clear to me now.
However, I didn’t quite understand the second part. What do you mean by the remaining amount of electricity? The individual electricity meters can be easily billed to the separate residential units. The general electricity meter includes the heat pump electricity + corridor lighting. So by the remaining amount of electricity, do you mean the general electricity meter (heat pump + corridor lighting)?
When you say "share of thermal energy for hot water," you mean the consumption of the compressor and the auxiliary heater, right? Does the "delivered energy" of the heat pump play any role? That actually doesn’t have anything to do with consumption itself.
What exactly do you mean by "allocate that to the electricity"?
Maybe it’s easier to understand with some numbers.
However, I didn’t quite understand the second part. What do you mean by the remaining amount of electricity? The individual electricity meters can be easily billed to the separate residential units. The general electricity meter includes the heat pump electricity + corridor lighting. So by the remaining amount of electricity, do you mean the general electricity meter (heat pump + corridor lighting)?
When you say "share of thermal energy for hot water," you mean the consumption of the compressor and the auxiliary heater, right? Does the "delivered energy" of the heat pump play any role? That actually doesn’t have anything to do with consumption itself.
What exactly do you mean by "allocate that to the electricity"?
Maybe it’s easier to understand with some numbers.
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