Bulla2000
2010-07-27 08:42:27
- #1
After we made progress with our efforts to secure a building plot, we are now facing the problem of choosing the right heating system. The representative of Fa. Ambiente Massivhaus said that only once the plot and house are finalized will he carry out a heating surface calculation and heat demand calculation (or whatever it is called). A underfloor heating system will definitely be installed. He recommends an air heat pump system with direct evaporator. The residential area is connected to natural gas.
Now my question: when I read all this, there is no compelling reason to install an air heat pump. Very low performance in winter (maybe global warming will still come), poor annual performance factor compared to surface collectors and probes, and high noise levels due to massive air circulation. In addition, high electricity costs in winter due to auxiliary heater/heating rod. The aforementioned alternatives would be better in this regard. But such a heat pump with surface collectors also costs significantly more, mainly because of the earthworks. Our house will have a living area of about 125-130 m2 (1.5 stories), so approximately 260 m2 of surface would be needed. This would be available on the plot. What would something like that roughly cost? So excavation/earthworks etc.
Furthermore, I am considering heating with gas, i.e. installing a gas condensing boiler. Plus hot water preparation on the roof. That would be quite inexpensive at first. Since today’s houses are all well insulated (Energy Saving Ordinance 2009), and a condensing boiler can heat very efficiently compared to older systems, the heating costs should be manageable, right? I mean, hot water is heated by the sun for 3/4 of the year and thus does not need gas, the house is well insulated and the burner is economical... three factors in favor. Or am I completely wrong about that?
In 10 years or later, one could still switch from gas to whatever.
Now my question: when I read all this, there is no compelling reason to install an air heat pump. Very low performance in winter (maybe global warming will still come), poor annual performance factor compared to surface collectors and probes, and high noise levels due to massive air circulation. In addition, high electricity costs in winter due to auxiliary heater/heating rod. The aforementioned alternatives would be better in this regard. But such a heat pump with surface collectors also costs significantly more, mainly because of the earthworks. Our house will have a living area of about 125-130 m2 (1.5 stories), so approximately 260 m2 of surface would be needed. This would be available on the plot. What would something like that roughly cost? So excavation/earthworks etc.
Furthermore, I am considering heating with gas, i.e. installing a gas condensing boiler. Plus hot water preparation on the roof. That would be quite inexpensive at first. Since today’s houses are all well insulated (Energy Saving Ordinance 2009), and a condensing boiler can heat very efficiently compared to older systems, the heating costs should be manageable, right? I mean, hot water is heated by the sun for 3/4 of the year and thus does not need gas, the house is well insulated and the burner is economical... three factors in favor. Or am I completely wrong about that?
In 10 years or later, one could still switch from gas to whatever.