At Rensch-Haus, KfW 40 houses come standard with an internal heat pump featuring central ventilation and fresh air heating. For an additional cost, an external heat pump with underfloor heating is also available.
Does anyone have experience with fresh air heating?
I am familiar with underfloor heating; it is somewhat slow to respond but works perfectly.
The sales representative recommends the fresh air heating, even though it is less expensive.
I would be very grateful for any experiences.
Thank you!
Does anyone have experience with fresh air heating?
I am familiar with underfloor heating; it is somewhat slow to respond but works perfectly.
The sales representative recommends the fresh air heating, even though it is less expensive.
I would be very grateful for any experiences.
Thank you!
I
Irgendwoabaier17 Oct 2015 16:44Of course he recommends the heating system that brings him the highest profit. And if the choice is Heating System A or no contract, then it will be Heating System A—regardless of the technology behind it.
The question is: what is the heating load? What are the realistically expected costs (operation, maintenance, upkeep, initial investment)?
A ventilation heating system means that all the heat lost from the house (through walls, ventilation losses, hot water heating, etc.) must be replaced by warm air blown back into the house. This naturally requires more or less air volume and warmer supply air depending on the room size and the amount of heat needed. And how is this warm air generated? In many cases, by electrically heated coils. The less heat lost through the walls, the more reasonable this solution can still be.
The question is: what is the heating load? What are the realistically expected costs (operation, maintenance, upkeep, initial investment)?
A ventilation heating system means that all the heat lost from the house (through walls, ventilation losses, hot water heating, etc.) must be replaced by warm air blown back into the house. This naturally requires more or less air volume and warmer supply air depending on the room size and the amount of heat needed. And how is this warm air generated? In many cases, by electrically heated coils. The less heat lost through the walls, the more reasonable this solution can still be.
Example:
If:
- the air heating system costs 1000 euros but is sold to you for 2000 euros, the seller makes a profit of 1000 euros.
- the heat pump costs 1500 euros but is sold to you for 2000 euros, the seller only makes a profit of 500 euros.
Both heating systems heat your house poorly, but the seller doesn’t care... their main goal is to maximize their profit.
In the end, the one who loses out is you, because your heating system may not be suitable for your house and ends up consuming a huge amount of energy...
If:
- the air heating system costs 1000 euros but is sold to you for 2000 euros, the seller makes a profit of 1000 euros.
- the heat pump costs 1500 euros but is sold to you for 2000 euros, the seller only makes a profit of 500 euros.
Both heating systems heat your house poorly, but the seller doesn’t care... their main goal is to maximize their profit.
In the end, the one who loses out is you, because your heating system may not be suitable for your house and ends up consuming a huge amount of energy...
We have this type of ventilation heating system and are very satisfied (heading into our third Bavarian winter). However, there are a few things to keep in mind. I have explained these in more detail elsewhere: https://www.hausbau-forum.de/threads/ausschliessliche-lueftungsheizung-im-Fertighaus.12150/page-3#post-96985
In combination with photovoltaic panels and a fireplace in a low-energy (or passive) house, it is a good and affordable heating and ventilation solution for me.
I would be cautious if the energy standard is lower than Efficiency House 55 / KfW 40, and I wouldn’t want to miss the fireplace on cold winter evenings (radiant heat). …and a preinstalled ground heat exchanger is recommended to ensure efficient operation even at very low sub-zero temperatures.
In combination with photovoltaic panels and a fireplace in a low-energy (or passive) house, it is a good and affordable heating and ventilation solution for me.
I would be cautious if the energy standard is lower than Efficiency House 55 / KfW 40, and I wouldn’t want to miss the fireplace on cold winter evenings (radiant heat). …and a preinstalled ground heat exchanger is recommended to ensure efficient operation even at very low sub-zero temperatures.
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