ᐅ Energy Performance Certificate and Heating Costs, Cost Assessment/Calculation
Created on: 5 Jun 2014 10:46
J
JanBanan
Hello everyone,
dear forum members!
I have a question that has been on my mind.
We are in the process of buying a house, but we have the feeling that not everything is being fully disclosed, which I just want to mention as an introduction.
Here are some details:
• Year built: 2000
• Living area: 125 m² (1,345 sq ft)
• Energy consumption value from the energy certificate: 170 kWh/(m²·a)
• Gas boiler Logamax U112
These are the basic facts I have. Based on this, it should be possible to calculate the expected gas heating costs, right, or is that incorrect?
I ask for a very specific reason. When I calculate:
170 kWh/(m²·a) × €6.45 per kWh = €1096.50 : 12 months = €91.38 per month for heating costs
I hope I calculated this correctly, although I want to mention that I’m not concerned about being exactly €5 to €10 off — it’s more about something else. These figures come from the energy certificate, which I used to estimate the monthly costs.
When I asked the current owner of the house about their monthly heating costs, they told me it is €196 per month, which does not match my calculation from the energy certificate at all.
There must be a mistake somewhere, right?
Could you please help me figure this out?
Best regards
JanBanan
dear forum members!
I have a question that has been on my mind.
We are in the process of buying a house, but we have the feeling that not everything is being fully disclosed, which I just want to mention as an introduction.
Here are some details:
• Year built: 2000
• Living area: 125 m² (1,345 sq ft)
• Energy consumption value from the energy certificate: 170 kWh/(m²·a)
• Gas boiler Logamax U112
These are the basic facts I have. Based on this, it should be possible to calculate the expected gas heating costs, right, or is that incorrect?
I ask for a very specific reason. When I calculate:
170 kWh/(m²·a) × €6.45 per kWh = €1096.50 : 12 months = €91.38 per month for heating costs
I hope I calculated this correctly, although I want to mention that I’m not concerned about being exactly €5 to €10 off — it’s more about something else. These figures come from the energy certificate, which I used to estimate the monthly costs.
When I asked the current owner of the house about their monthly heating costs, they told me it is €196 per month, which does not match my calculation from the energy certificate at all.
There must be a mistake somewhere, right?
Could you please help me figure this out?
Best regards
JanBanan
E
ErikErdgas30 Dec 2014 18:12Hello JanBana,
even though the post is a bit older, an energy performance certificate or the calculated heating costs should not be the decisive factor in buying a house. As €uro correctly pointed out, the values from an energy certificate serve merely as a guideline. It is also important to clarify whether the values come from a calculated demand certificate or a consumption certificate. A demand certificate represents a type of “standardized” energy requirement, whereas a consumption certificate mostly reflects the user’s behavior. Therefore, the roughly estimated consumption based on the energy certificate can differ significantly from the actual consumption.
The house is relatively new, but several amendments to the energy saving regulations have come into effect meanwhile, so the building’s construction physics have somewhat deviated from the current technical standards. Nevertheless, I would not buy a house without advice from a qualified expert. This includes reviewing documents (plans, calculations, land register, building encumbrances, etc.) as well as an inspection, which can be done for a very small percentage of the purchase price. It is important to consider investments that will be needed in the coming years when buying. For example, heating systems are generally expected to have a service life of about 20 years. So, a system replacement would likely be required in around 5 years, with costs of approximately 5,000 € (depending on scope, possibly more for additional measures). This would, in turn, significantly reduce heating costs regardless of user behavior.
Best regards, Erik
even though the post is a bit older, an energy performance certificate or the calculated heating costs should not be the decisive factor in buying a house. As €uro correctly pointed out, the values from an energy certificate serve merely as a guideline. It is also important to clarify whether the values come from a calculated demand certificate or a consumption certificate. A demand certificate represents a type of “standardized” energy requirement, whereas a consumption certificate mostly reflects the user’s behavior. Therefore, the roughly estimated consumption based on the energy certificate can differ significantly from the actual consumption.
The house is relatively new, but several amendments to the energy saving regulations have come into effect meanwhile, so the building’s construction physics have somewhat deviated from the current technical standards. Nevertheless, I would not buy a house without advice from a qualified expert. This includes reviewing documents (plans, calculations, land register, building encumbrances, etc.) as well as an inspection, which can be done for a very small percentage of the purchase price. It is important to consider investments that will be needed in the coming years when buying. For example, heating systems are generally expected to have a service life of about 20 years. So, a system replacement would likely be required in around 5 years, with costs of approximately 5,000 € (depending on scope, possibly more for additional measures). This would, in turn, significantly reduce heating costs regardless of user behavior.
Best regards, Erik
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