Experiences with infrared heaters

  • Erstellt am 2022-02-10 11:10:04

WilderSueden

2023-10-07 13:48:08
  • #1
There is a longer thread about Vestaxx here. The additional cost compared to a conventional infrared heater is not justified.

I also find 3000 kWh heating electricity for direct heating very optimistic even for a KfW40 house. For comparison: We have 130 sqm living space (EH40+), the energy consultant calculates a usable building area of 152 sqm at 12.4 kWh/sqm = 1884 kWh electricity, but with a heat pump. Accordingly, you still have to multiply that by the seasonal performance factor to get the demand of a direct electric heating. Realistically, it would be more like 6000 kWh for this size. Photovoltaics does not bring you much, since on the one hand there is little yield in winter and the yield is correlated with solar gains.
 

eenuep1

2023-10-07 16:01:10
  • #2


In another thread, I discuss a similar topic – by now I have a construction specification.
The U-values of the wall and window surfaces are noted, but I had to estimate those for the roof and floor.

According to my calculations, my "KFW 40" house with 81 sqm of living space would need about 5000 kWh/year.

Therefore, I am considering using an air heat pump or an air-to-water heat pump for my heating. I will still get the exact prices for this. With such a solution, I can save not only on hot water preparation but also spare myself a lot of stress when heating. An additional aspect: I work from home and am therefore almost always there. If you don’t move for about 8 hours straight, it can get quite cool even at 22° – depending on how the body produces heat.
 

eenuep1

2023-10-07 16:24:27
  • #3


I probably miscalculated after all – 3000 kWh is probably more realistic. It’s really difficult for a layperson. A public register of average values from all new buildings would be more helpful.

Nevertheless, I am moving away from infrared heating/low-energy electric heating with efficiency 1. It’s just too risky for me, only to save a possibly few thousand € more in initial investment.
 

dertill

2023-10-23 11:00:58
  • #4

The Building Energy Act 2020 Annex 1 specifies the structure of the reference building, with which every new building must be compared. The new building must not exceed 55% of the primary energy demand of the reference building.
The Ht' limit values (maximum permissible specific heat transfer coefficients) have not been changed. They are therefore still valid as maximum values.
For the passive house standard, you actually have to get below 0.1 for all components (except windows). The average is therefore somewhere in between.
 

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