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Sambi151124 Jul 2013 13:48Hello,
Our house is planned, and the energy consultant has already done the calculations. However, he was not really able to give a clear assessment regarding the cost-effectiveness of the construction project. We achieve the KfW 55 standard with the following setup:
Floor: No basement, perimeter insulation under the slab
Walls: Sand-lime brick 17.5cm (7 inches); 14cm (5.5 inches) insulation, 1.5cm (0.6 inches) air gap, 11.5cm (4.5 inches) facing brick
Windows: Triple glazing
Heating: Ground-source heat pump with a combined storage tank for hot water; underfloor heating throughout the entire house.
Additionally, a solar thermal system (7.9m² (85 ft²)) for hot water preparation in the combined storage tank.
We will also have a fireplace, which can have water jackets, but this was not considered in the calculations.
Now my question: Without the solar system, we don’t reach KfW 55 but only KfW 70. The energy consultant says that the solar system only becomes cost-effective with 3.5 or more people in the household.
Can anyone share approximate cost information? So, do I have to invest much more than the €2,500 I save by achieving KfW 55?
Does a fireplace with water jackets make sense in this setup?
Many thanks for any experience or feedback on my questions.
Our house is planned, and the energy consultant has already done the calculations. However, he was not really able to give a clear assessment regarding the cost-effectiveness of the construction project. We achieve the KfW 55 standard with the following setup:
Floor: No basement, perimeter insulation under the slab
Walls: Sand-lime brick 17.5cm (7 inches); 14cm (5.5 inches) insulation, 1.5cm (0.6 inches) air gap, 11.5cm (4.5 inches) facing brick
Windows: Triple glazing
Heating: Ground-source heat pump with a combined storage tank for hot water; underfloor heating throughout the entire house.
Additionally, a solar thermal system (7.9m² (85 ft²)) for hot water preparation in the combined storage tank.
We will also have a fireplace, which can have water jackets, but this was not considered in the calculations.
Now my question: Without the solar system, we don’t reach KfW 55 but only KfW 70. The energy consultant says that the solar system only becomes cost-effective with 3.5 or more people in the household.
Can anyone share approximate cost information? So, do I have to invest much more than the €2,500 I save by achieving KfW 55?
Does a fireplace with water jackets make sense in this setup?
Many thanks for any experience or feedback on my questions.
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