ᐅ Heating system for a house with an auxiliary building, underfloor heating, gas / geothermal energy
Created on: 21 Jan 2013 21:12
V
Vwgolfcabrio
Hello,
I plan to build a house in the next few months (about 4 months). The plot of land is already available (30 x 50m (98 x 164 ft)). I want to build a house (about 165m² (1,776 sq ft) to KfW 40 standard) and an outbuilding (about 100m² (1,076 sq ft), normal insulation standard with 24cm (9.5 inches) T10 brick). The heating system will be installed in the outbuilding. Both the house and the outbuilding need to be heated. In the outbuilding, a heating output of 10-12°C (50-54°F) will be sufficient. The entire system should be realized with underfloor heating. Which type of heating system would you recommend (gas, geothermal, etc.)? What should be taken into consideration?
Regards, Fabian
I plan to build a house in the next few months (about 4 months). The plot of land is already available (30 x 50m (98 x 164 ft)). I want to build a house (about 165m² (1,776 sq ft) to KfW 40 standard) and an outbuilding (about 100m² (1,076 sq ft), normal insulation standard with 24cm (9.5 inches) T10 brick). The heating system will be installed in the outbuilding. Both the house and the outbuilding need to be heated. In the outbuilding, a heating output of 10-12°C (50-54°F) will be sufficient. The entire system should be realized with underfloor heating. Which type of heating system would you recommend (gas, geothermal, etc.)? What should be taken into consideration?
Regards, Fabian
Hello,
basically, all different heating systems are available for you to choose from. The question is whether you prefer lower initial costs with somewhat higher ongoing expenses, or if you can include higher upfront costs in your budget. Currently, gas condensing boilers offer a good balance, as their purchase costs are usually the lowest and their operating costs are more favorable compared to oil heating. Other heating options, such as combined heat and power units or heat pump systems, can certainly provide even lower operating costs, but the significantly higher initial investment needs to pay off over the period of use.
Additionally, consider how much maintenance effort you want for your heating system. Solid fuel boilers usually require more operational work compared to gas condensing boilers or heat pumps. So it’s important to think about the effort you want now, but especially also in 20 years.
In conclusion, there is no absolutely “right” system based on your information, but factors like maintenance effort and costs can be limiting conditions that already narrow down your choices.
Best regards
Erik
basically, all different heating systems are available for you to choose from. The question is whether you prefer lower initial costs with somewhat higher ongoing expenses, or if you can include higher upfront costs in your budget. Currently, gas condensing boilers offer a good balance, as their purchase costs are usually the lowest and their operating costs are more favorable compared to oil heating. Other heating options, such as combined heat and power units or heat pump systems, can certainly provide even lower operating costs, but the significantly higher initial investment needs to pay off over the period of use.
Additionally, consider how much maintenance effort you want for your heating system. Solid fuel boilers usually require more operational work compared to gas condensing boilers or heat pumps. So it’s important to think about the effort you want now, but especially also in 20 years.
In conclusion, there is no absolutely “right” system based on your information, but factors like maintenance effort and costs can be limiting conditions that already narrow down your choices.
Best regards
Erik
V
Vwgolfcabrio25 Jan 2013 11:37Hello Erik,
thanks for your assessment. I don’t want to waste too much space for the oil tank or wood/pellet storage. So, really, only the gas condensing boiler or heat pump options remain. What bothers me about the heat pump is the lack of long-term experience (20 years) and, of course, the high initial costs. The gas condensing system can be replaced cheaply and easily in case of failure. What is your view on the future price development of gas? In the USA, prices are currently dropping like crazy.
Best regards, Fabian
thanks for your assessment. I don’t want to waste too much space for the oil tank or wood/pellet storage. So, really, only the gas condensing boiler or heat pump options remain. What bothers me about the heat pump is the lack of long-term experience (20 years) and, of course, the high initial costs. The gas condensing system can be replaced cheaply and easily in case of failure. What is your view on the future price development of gas? In the USA, prices are currently dropping like crazy.
Best regards, Fabian
Hello,
It is rather unusual for a garage to require nearly the same heating energy as a residential building!
Best regards.
Vwgolfcabrio schrieb:What is the reason for this?
....They all say that using a low supply temperature won’t achieve much....
Vwgolfcabrio schrieb:Absolutely nothing! Overall, the whole thing seems somewhat odd. If the garage is heated, it is considered part of the building. It is quite surprising that the heating load is just as high despite a significantly lower room temperature. Also, room heating loads should not be compared with the standard heating load of a building!
What do you think about this?
It is rather unusual for a garage to require nearly the same heating energy as a residential building!
Best regards.
V
Vwgolfcabrio17 Sep 2013 15:33Hello,
the reason why the low supply temperature in the garage is not very effective is the use of too many radiators. The garage is only meant to be heated sporadically (as needed). Keeping it frost-free is obvious, but for example, reaching around 15°C (59°F) on the weekend as quickly as possible.
What would you recommend or say about this?
the reason why the low supply temperature in the garage is not very effective is the use of too many radiators. The garage is only meant to be heated sporadically (as needed). Keeping it frost-free is obvious, but for example, reaching around 15°C (59°F) on the weekend as quickly as possible.
What would you recommend or say about this?
Vwgolfcabrio schrieb:
...the reason why a low supply temperature in the garage doesn't really help is the use of too many radiators. The garage is only supposed to be heated occasionally (as needed). So keeping the garage frost-free is clear, but for example, on weekends, it should also be possible to quickly heat it up to around 15°C (59°F). Isn’t there already a contradiction in that? ;-) Also, verbal statements are usually pointless, so better check the calculations! ;-)Vwgolfcabrio schrieb:
...What would you recommend or say about that? Actually, everything has already been said. The whole setup seems to be tending toward a generally flawed system. I suggest consulting an independent building services engineer/planning consultant, not linked to any sales!Best regards
Hello,
I would also recommend having a heat load calculation done again, preferably for both scenarios: a garage that is frost-free only and a garage heated to the desired room temperature. I also doubt that it makes sense to connect two such different supply temperatures, especially since you probably don’t need large radiant surfaces for the lower temperatures in the garage. The question then is whether you plan to install an electric heater in the garage for quick warming, while using the gas heating system only for basic heating and maintaining the temperature.
Best regards
I would also recommend having a heat load calculation done again, preferably for both scenarios: a garage that is frost-free only and a garage heated to the desired room temperature. I also doubt that it makes sense to connect two such different supply temperatures, especially since you probably don’t need large radiant surfaces for the lower temperatures in the garage. The question then is whether you plan to install an electric heater in the garage for quick warming, while using the gas heating system only for basic heating and maintaining the temperature.
Best regards
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