Good day.
We have purchased a semi-detached house built in 1971.
130 sqm (1400 sq ft) of living space.
The attic has been converted, and the roof was insulated and re-covered in 2007.
Double glazing from 1998 with wooden frames.
The original heating system/boiler (oil) is still installed, which we would like to replace with an efficient unit meeting today’s standards.
There is no gas supply at the front door, so we can rule that out.
I personally exclude pellet heating due to the very high initial investment costs.
In the living area (living room and dining room) there is a nice Swedish wood stove heated with free wood.
What would you recommend, especially regarding an efficient and reliable oil condensing boiler?
Additionally, we are considering combining the oil condensing boiler with solar thermal systems, primarily for domestic hot water heating, where in the summer the oil consumption could be zero because the system is switched off.
I already have several offers, but I am interested in your opinions and thoughts on this!
Thank you!
Best regards
We have purchased a semi-detached house built in 1971.
130 sqm (1400 sq ft) of living space.
The attic has been converted, and the roof was insulated and re-covered in 2007.
Double glazing from 1998 with wooden frames.
The original heating system/boiler (oil) is still installed, which we would like to replace with an efficient unit meeting today’s standards.
There is no gas supply at the front door, so we can rule that out.
I personally exclude pellet heating due to the very high initial investment costs.
In the living area (living room and dining room) there is a nice Swedish wood stove heated with free wood.
What would you recommend, especially regarding an efficient and reliable oil condensing boiler?
Additionally, we are considering combining the oil condensing boiler with solar thermal systems, primarily for domestic hot water heating, where in the summer the oil consumption could be zero because the system is switched off.
I already have several offers, but I am interested in your opinions and thoughts on this!
Thank you!
Best regards
E
ErikErdgas27 Jul 2015 10:24Hello,
There is not enough information to properly assess the building’s thermal insulation level. I recommend consulting a qualified energy advisor, as there is likely still potential for improvement. The windows installed in 1998 are now almost 20 years old. Nowadays, triple-glazed windows are available that perform better than those installed, but whether they are cost-effective depends on your situation. An energy advisor can provide independent and neutral advice. You can also take advantage of government subsidies of up to 800 €.
The Energy Saving Ordinance (Energieeinsparverordnung) requires that heating boilers older than 30 years must no longer be used. So, the boiler definitely needs to be replaced. Even if there is no gas connection, you might consider switching to liquefied petroleum gas (LPG) for heating. I would strongly recommend investigating this option, as investing in oil heating is becoming outdated. Oil is more expensive than gas, requires more storage space, can cause odor nuisances, needs to be ordered, may pose difficulties when reselling or renting the property due to its negative image, and generates more fine dust and CO2 emissions.
What is the condition of the wood-burning stove? How sustainable is the availability of free wood in the medium to long term? As an additional heating option, it’s great. If a replacement becomes necessary, consider a stove with water jackets for heating water. For a solar thermal system, the roof surface should ideally face south with an inclination of less than 30° (degrees). A solar system has the advantage of supporting your heating during transitional seasons (spring/ autumn), and in summer, you can turn off your boiler. In summer, every boiler operates inefficiently and consumes more energy. All options mentioned can be subsidized or financed through loans from KfW.
Best regards,
Erik
There is not enough information to properly assess the building’s thermal insulation level. I recommend consulting a qualified energy advisor, as there is likely still potential for improvement. The windows installed in 1998 are now almost 20 years old. Nowadays, triple-glazed windows are available that perform better than those installed, but whether they are cost-effective depends on your situation. An energy advisor can provide independent and neutral advice. You can also take advantage of government subsidies of up to 800 €.
The Energy Saving Ordinance (Energieeinsparverordnung) requires that heating boilers older than 30 years must no longer be used. So, the boiler definitely needs to be replaced. Even if there is no gas connection, you might consider switching to liquefied petroleum gas (LPG) for heating. I would strongly recommend investigating this option, as investing in oil heating is becoming outdated. Oil is more expensive than gas, requires more storage space, can cause odor nuisances, needs to be ordered, may pose difficulties when reselling or renting the property due to its negative image, and generates more fine dust and CO2 emissions.
What is the condition of the wood-burning stove? How sustainable is the availability of free wood in the medium to long term? As an additional heating option, it’s great. If a replacement becomes necessary, consider a stove with water jackets for heating water. For a solar thermal system, the roof surface should ideally face south with an inclination of less than 30° (degrees). A solar system has the advantage of supporting your heating during transitional seasons (spring/ autumn), and in summer, you can turn off your boiler. In summer, every boiler operates inefficiently and consumes more energy. All options mentioned can be subsidized or financed through loans from KfW.
Best regards,
Erik
Measures like solar thermal (ST) for hot water often are not worthwhile – the initial investment is relatively high, while the savings are fairly low (simply because hot water consumption is not very high).
In my opinion, investing in a new heating system is even mandatory for you – a modern oil condensing boiler will likely offer unbeatable value for money. Also, check with the relevant authorities for any available subsidies or grants.
In my opinion, investing in a new heating system is even mandatory for you – a modern oil condensing boiler will likely offer unbeatable value for money. Also, check with the relevant authorities for any available subsidies or grants.
Koempy schrieb:
We faced the same decision last year. In the end, it was just a condensing oil boiler with a small hot water storage tank. Everything else would have been too expensive or wouldn’t have suited the house.That’s why it is important to have the heating load of the renovated building calculated, so the most cost-effective heat generator can be selected and sized accordingly. Of course, besides economic considerations, ecological aspects can also be taken into account...
A solar thermal system was considered at the beginning, but it won’t be cost-effective, so we will only install an oil condensing boiler/heating system.
The wood-burning stove is a few years old and is located in the living/dining area.
Wood won’t cost me anything since we have several forests nearby, so it’s free.
The only cost is the effort and sweat to cut the wood into smaller pieces. 😉
@Koempy: Which condensing boiler model exactly did you decide on back then, including brand/type?
For how many square meters (square feet) of living space and what kind of insulation/age does the house have?
Kind regards
The wood-burning stove is a few years old and is located in the living/dining area.
Wood won’t cost me anything since we have several forests nearby, so it’s free.
The only cost is the effort and sweat to cut the wood into smaller pieces. 😉
@Koempy: Which condensing boiler model exactly did you decide on back then, including brand/type?
For how many square meters (square feet) of living space and what kind of insulation/age does the house have?
Kind regards
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