In an 85m² (915 sq ft) apartment, the gas heating system needs to be renovated; the existing system dates back to the 1950s or 1960s. The boiler is running somewhat irregularly, the CO level is borderline, and some radiators are corroded through.
The question is what costs to expect.
A new boiler can be found for around 1,000 euros, and I estimated the radiators at 8 units x 300 euros each, totaling 3,400 euros.
But a friend working in construction quoted “about 10,000 euros.”
Is the installation really that complex?
Do the pipes necessarily have to be replaced?
They are copper, and from my amateur perspective, they should not wear out, rust, or similar — right?
Thanks for any advice / ED
The question is what costs to expect.
A new boiler can be found for around 1,000 euros, and I estimated the radiators at 8 units x 300 euros each, totaling 3,400 euros.
But a friend working in construction quoted “about 10,000 euros.”
Is the installation really that complex?
Do the pipes necessarily have to be replaced?
They are copper, and from my amateur perspective, they should not wear out, rust, or similar — right?
Thanks for any advice / ED
Okay, I also did some reading on condensing technology, thanks to your tip. It seems that the benefits of this investment (regardless of whether the property is owner-occupied or rented out) mostly arise when the heating system (boiler and radiators) is operated close to its maximum capacity. Factors working against this are:
- System sized rather "generously"
- Only heating individual rooms, while other thermostats are turned down
- Transition periods in spring and winter
- System sized rather "generously"
- Only heating individual rooms, while other thermostats are turned down
- Transition periods in spring and winter
ed55 schrieb:
...It seems that the benefits of this investment (regardless of whether it is for personal use or rental) mainly occur when the heating system (boiler and radiators) is operated close to its maximum capacity.... First, the actual demand (power, energy) for heating and hot water is determined. Then, the appropriate device is selected. Modern gas condensing boilers can modulate their output down to a ratio of 1:10. This allows efficient operation under partial load most of the time. The heating load of the building and the required power near the heating limit are needed initially to find the right unit. Additionally, some controls have an "eco" function that gradually maintains the system's temperature spread (the heating circuit pump modulates downward). The idea that "more is better" is an outdated concept and can often cause significant problems.Regards.
E
ErikErdgas12 Nov 2013 16:47Hello,
from my perspective, the flat rate of 10,000 can be seen as a rough estimate, where I suspect your friend might still be flexible, but especially for a first estimate without specific details, the figures often end up significantly higher.
Regarding the system size, it should definitely be tailored to the actual needs. A generic sizing often leads to significantly oversized systems, which are less cost-effective. Even if the system is not primarily for personal use, it is important—also in rental apartments—to ensure that energy is not wasted.
Best regards, Erik
from my perspective, the flat rate of 10,000 can be seen as a rough estimate, where I suspect your friend might still be flexible, but especially for a first estimate without specific details, the figures often end up significantly higher.
Regarding the system size, it should definitely be tailored to the actual needs. A generic sizing often leads to significantly oversized systems, which are less cost-effective. Even if the system is not primarily for personal use, it is important—also in rental apartments—to ensure that energy is not wasted.
Best regards, Erik
Thank you for the suggestions.
Regarding the size of the gas boilers, I only see 18, 20, and 24 kW options, so the range of available capacities doesn’t seem to be very wide.
The maximum kW needed during a cold winter can be calculated based on the size, exterior surface areas, and windows.
Regarding the size of the gas boilers, I only see 18, 20, and 24 kW options, so the range of available capacities doesn’t seem to be very wide.
The maximum kW needed during a cold winter can be calculated based on the size, exterior surface areas, and windows.