Hello,
I am currently planning my construction project for an urban villa (KfW40+) with about 140m² (1507 sq ft) plus a waterproof basement.
I have four prefabricated house companies (timber frame construction) to choose from, all of which have different opinions regarding the heating technology.
A water pump is the only option that makes sense, that much is clear. Everything else does not seem reasonable.
However, I am undecided between a Proxon system (air-to-air) and an air-to-water heat pump.
The Proxon heating system has a somewhat poor reputation, based on what I have read in various other forums.
Are there any experiences or tips regarding the heating technology? What are your recommendations? Is it also possible to have the heating system installed externally by a heating company and exclude the prefabricated house provider? Has anyone had experience with this? What are your general experiences or approaches with prefabricated house companies regarding heating technology?
I would appreciate any advice.
Kind regards
Simon
I am currently planning my construction project for an urban villa (KfW40+) with about 140m² (1507 sq ft) plus a waterproof basement.
I have four prefabricated house companies (timber frame construction) to choose from, all of which have different opinions regarding the heating technology.
A water pump is the only option that makes sense, that much is clear. Everything else does not seem reasonable.
However, I am undecided between a Proxon system (air-to-air) and an air-to-water heat pump.
The Proxon heating system has a somewhat poor reputation, based on what I have read in various other forums.
Are there any experiences or tips regarding the heating technology? What are your recommendations? Is it also possible to have the heating system installed externally by a heating company and exclude the prefabricated house provider? Has anyone had experience with this? What are your general experiences or approaches with prefabricated house companies regarding heating technology?
I would appreciate any advice.
Kind regards
Simon
The regional solid construction builders were immediately ruled out by us.
Passive house nonsense.
KfW? No, just build and put a photovoltaic system on the roof.
No one looked at the plot.
Rensch-Haus came by.
Schwörerhaus said, "We build, but hire an architect because of the plot."
Wir leben Haus came to the plot.
Passive house nonsense.
KfW? No, just build and put a photovoltaic system on the roof.
No one looked at the plot.
Rensch-Haus came by.
Schwörerhaus said, "We build, but hire an architect because of the plot."
Wir leben Haus came to the plot.
Well, every masonry contractor who visited our plot had a completely different approach, so experiences vary a lot...
Of course, they won’t come if they already have about 15 new projects at the moment, and then you say: oh, I have 5 prefabricated house suppliers competing, can you also come take a look as number 6?
Of course, they won’t come if they already have about 15 new projects at the moment, and then you say: oh, I have 5 prefabricated house suppliers competing, can you also come take a look as number 6?
Snowy36 schrieb:
Well, every contractor specializing in solid construction came to our site—that’s how different the experiences are...
But of course, they won’t come if they already have 15 new projects and you say: oh, I have 5 prefabricated house providers in the running, can you be number 6 and come take a look?It wasn’t like that for us. We wanted solid construction and then looked for alternatives. We didn’t have 5 offers at all. There were 3 bids that, after the first round, were surprisingly close to each other. We then chose the one that suited us best.
H
Heizungsbau7620 Apr 2020 20:53bon1980 schrieb:
Well, which is the better heat carrier, air or water? That already gives you the answer...
The opinion about the air-to-air heat pump doesn’t come out of nowhere. What you are writing is simply nonsense!
The fact is, air only has a lower specific heat capacity compared to water.
That’s why ventilation systems move cubic meters per hour (m³/h) and not liters per hour (L/h), which also explains the larger duct cross-sections.
It is also a fact that we perceive heat as radiant or ambient heat/air temperature.
All hot water heating systems must centrally heat the water and then transport it to the room to be heated. Until then, there are heat generation, system, and pipe losses.
Then the heating surface (radiators/floor heating) has to reach temperature to emit radiant heat or to warm the room air through convection. All this takes time, especially in systems with low supply temperatures, such as heat pumps.
Ventilation of the building, of course with heat recovery, is also still necessary today.
In a ventilation heating system, the ventilation is running anyway and doing what it is supposed to do: ventilate.
In every supply air element, in every room, there is a small electric reheating element that compensates for the heat loss caused by the ventilation heat exchanger (about 15%). Directly in the room, directly in the perceivable room air, instantly at the push of a button. This is much faster than any hot water heating system and fully controllable for each individual room. If this electric heating element is powered by the owner’s own photovoltaic system, it doesn’t get better than that.
Now comes the heat pump part of the system. The exhaust air, which has already been cooled in the ventilation heat exchanger, is supplied to an air-to-(drinking hot) water heat pump that extracts the residual heat contained in it and converts it into hot water. This is a widely used technology for many years and is integrated into the system at the most suitable location!
Well planned, designed, commissioned, and programmed, it is an unbeatable, cost-effective, and efficient system.
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