Good day dear community,
I have bought a house built in 1914 and am planning a renovation. The plan is to replace all the windows. Currently, almost all windows are single-glazed with wooden frames. The new windows will be double-glazed with a U-value of 0.91. The attic will be fully converted. For this, the roof will be insulated with 24 cm (9.5 inches) of rafter insulation. The building envelope is currently uninsulated.
So far, I have only spoken with one heating specialist. He suggested I choose a pellet heating system because a heat pump would not be suitable for my house. The reasons given were:
# Not enough insulation, resulting in too high supply temperatures.
# Therefore, not economically efficient enough.
I actually like the idea of a pellet heating system because I view wood as a positive raw material, and the operating costs are supposed to be lower than those of an oil heating system, according to calculations. Additionally, I could receive a 45% subsidy through BAFA.
However, on this forum, I have come across several posts that clearly advise against pellet heating. The reasons cited are:
# All renovation projects on older buildings are now switching to pellet heating, which drives pellet prices up.
# Pellet heating systems are very prone to faults and therefore expensive to service and repair.
# Removing the ash is a hassle.
# Heat pumps are the technology of the future, and pellet heating is doomed.
This has made me doubt, hence this post. Can anyone help me with this decision? Are the reasons against pellet heating valid, or what do you think?
Facts:
Year built: 1914
Detached single-family house
According to the energy certificate:
Final energy demand 298 kWh/(m²a) (kWh per square meter per year)
Primary energy demand actual value 332 kWh/(m²a), required value 118 kWh/(m²a)
Energy performance of the building envelope: actual value 1.26 W/(m²K), required value 0.56 W/(m²K)
Heating type: low-temperature oil boiler from 1986 (tanks on ground floor (7.73 m² (83 sq ft)), burner in the basement (10.5 m² (113 sq ft)))
Living area: 105 m² (1,130 sq ft), with attic conversion approx. 190 m² (2,045 sq ft)
No gas connection available.
District heating could be installed for 2,500 €.
Space for pellet storage is available where the oil heating tanks are currently located.
If you need more information, feel free to ask.
Thank you in advance for your tips, information, and thoughts!
I have bought a house built in 1914 and am planning a renovation. The plan is to replace all the windows. Currently, almost all windows are single-glazed with wooden frames. The new windows will be double-glazed with a U-value of 0.91. The attic will be fully converted. For this, the roof will be insulated with 24 cm (9.5 inches) of rafter insulation. The building envelope is currently uninsulated.
So far, I have only spoken with one heating specialist. He suggested I choose a pellet heating system because a heat pump would not be suitable for my house. The reasons given were:
# Not enough insulation, resulting in too high supply temperatures.
# Therefore, not economically efficient enough.
I actually like the idea of a pellet heating system because I view wood as a positive raw material, and the operating costs are supposed to be lower than those of an oil heating system, according to calculations. Additionally, I could receive a 45% subsidy through BAFA.
However, on this forum, I have come across several posts that clearly advise against pellet heating. The reasons cited are:
# All renovation projects on older buildings are now switching to pellet heating, which drives pellet prices up.
# Pellet heating systems are very prone to faults and therefore expensive to service and repair.
# Removing the ash is a hassle.
# Heat pumps are the technology of the future, and pellet heating is doomed.
This has made me doubt, hence this post. Can anyone help me with this decision? Are the reasons against pellet heating valid, or what do you think?
Facts:
Year built: 1914
Detached single-family house
According to the energy certificate:
Final energy demand 298 kWh/(m²a) (kWh per square meter per year)
Primary energy demand actual value 332 kWh/(m²a), required value 118 kWh/(m²a)
Energy performance of the building envelope: actual value 1.26 W/(m²K), required value 0.56 W/(m²K)
Heating type: low-temperature oil boiler from 1986 (tanks on ground floor (7.73 m² (83 sq ft)), burner in the basement (10.5 m² (113 sq ft)))
Living area: 105 m² (1,130 sq ft), with attic conversion approx. 190 m² (2,045 sq ft)
No gas connection available.
District heating could be installed for 2,500 €.
Space for pellet storage is available where the oil heating tanks are currently located.
If you need more information, feel free to ask.
Thank you in advance for your tips, information, and thoughts!
NilsHolgerson schrieb:
I just checked the current prices for district heating in my area. The kWh costs 9.551 cents. Online, pellet prices are estimated at 5.9 cents/kWh. That's quite a significant difference.That is true for pure consumption costs. Keep in mind that for district heating, you only have one pipe in the wall. You don’t need to invest in a pellet boiler, flue system, or pay for maintenance and chimney cleaning. Also, you’ll need a dedicated basement room to store the pellets. If your heating demand is low, then consumption costs are lower or similar to the ongoing costs including depreciation.
If you are renovating the attic anyway, you will likely have scaffolding set up. So why not insulate the facade at the same time, possibly as a DIY project? Then only the basement ceiling remains to be insulated. Discuss this with an energy consultant as suggested.
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NilsHolgerson3 Sep 2020 19:11At the moment, I’m hesitant to consult an energy advisor because I feel that they all just recommend the maximum level of insulation anyway and then want to charge €5000.
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hampshire3 Sep 2020 22:12I happened to visit Ökofen in Mickhausen today. It was about a pellet heating solution for an old farm. I found the concept, product, and company very convincing. Take a look online or visit them in person.
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NilsHolgerson4 Sep 2020 12:44Thanks for the information, I will talk to an energy consultant.
I will look into the company, thanks for the suggestion.
I will look into the company, thanks for the suggestion.
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