ᐅ Smart home system for underfloor heating in a KfW40+ energy-efficient house?
Created on: 13 Apr 2022 21:19
J
Juicy1990
Good morning dear forum,
We are currently building; the shell is almost complete, and the plan is to have a 165 sqm (1776 sq ft) city villa without a basement built to KfW40+ standard. Right now, we are going through the plumbing and electrical systems throughout the house, discussing various details.
There will be no wired smart home system. However, Homematic wireless will be used for the roller shutters and heating (only underfloor heating). Later, additional features could easily be added to this setup. Even a layperson like me can manage that… 🙂
Right now, I’m stuck on the heating control. Does controlling the underfloor heating manifold with electric actuators provide significant added value? Our heating installer has a clear opinion and says no! The idea is that properly setting up the underfloor heating once will yield a better annual performance factor than with smart home control. For me, that was basically a given.
By the way, the heating system will be an air-to-water heat pump. On the roof, there is a 12 kWp photovoltaic system with a 6.5 kWh battery storage. That might be relevant somehow.
What are your thoughts on this?
If you need more information, I’m happy to provide it.
Thank you very much for your feedback and best regards!
We are currently building; the shell is almost complete, and the plan is to have a 165 sqm (1776 sq ft) city villa without a basement built to KfW40+ standard. Right now, we are going through the plumbing and electrical systems throughout the house, discussing various details.
There will be no wired smart home system. However, Homematic wireless will be used for the roller shutters and heating (only underfloor heating). Later, additional features could easily be added to this setup. Even a layperson like me can manage that… 🙂
Right now, I’m stuck on the heating control. Does controlling the underfloor heating manifold with electric actuators provide significant added value? Our heating installer has a clear opinion and says no! The idea is that properly setting up the underfloor heating once will yield a better annual performance factor than with smart home control. For me, that was basically a given.
By the way, the heating system will be an air-to-water heat pump. On the roof, there is a 12 kWp photovoltaic system with a 6.5 kWh battery storage. That might be relevant somehow.
What are your thoughts on this?
If you need more information, I’m happy to provide it.
Thank you very much for your feedback and best regards!
I once had this in a project. For you, nothing really changes, except that the heat generator is not located in your basement. The control system inside the house then has to be managed either by an external control unit or by simple thermostats in the rooms. You have a transfer station with mixing valves installed in the utility room.
It only became problematic because it was not just district heating but also district cooling. However, what was supplied through the pipes and when was decided by the central plant. This often did not match the comfort preferences of the residents.
It only became problematic because it was not just district heating but also district cooling. However, what was supplied through the pipes and when was decided by the central plant. This often did not match the comfort preferences of the residents.
J
Juicy199014 Apr 2022 13:28Hello!
Wow, things are really lively here.
Thanks for all the responses.
I’ll try to address some of the points mentioned.
First of all, I’m fully aware that remote-controlled roller shutters don’t qualify as smart home technology. I just included that a bit lazily and illustratively here.
But now to the core of the discussion...
In simple terms for an amateur like me: basically, a control system or thermostatic radiator valve (TRV) seems entirely unnecessary?
So, no control valves at all?
How, for example, would you make the bedroom cooler than the rest of the house? Or is that question naive in itself? Visually, I have no objection to wall thermostats, but what is the technical or efficiency-related advantage here?
By the way, the heating system is a Tecalor Thz 5.5 eco, which includes integrated ventilation and a 230-liter (60-gallon) domestic hot water tank.
I’m really a desk person and probably not well informed. Sorry about that 🙂
Best regards!
Wow, things are really lively here.
Thanks for all the responses.
I’ll try to address some of the points mentioned.
First of all, I’m fully aware that remote-controlled roller shutters don’t qualify as smart home technology. I just included that a bit lazily and illustratively here.
But now to the core of the discussion...
In simple terms for an amateur like me: basically, a control system or thermostatic radiator valve (TRV) seems entirely unnecessary?
So, no control valves at all?
How, for example, would you make the bedroom cooler than the rest of the house? Or is that question naive in itself? Visually, I have no objection to wall thermostats, but what is the technical or efficiency-related advantage here?
By the way, the heating system is a Tecalor Thz 5.5 eco, which includes integrated ventilation and a 230-liter (60-gallon) domestic hot water tank.
I’m really a desk person and probably not well informed. Sorry about that 🙂
Best regards!
Juicy1990 schrieb:
... But now to the main point of the discussion...
In simple terms for an amateur like me: basically, a control valve or an ERR seems completely unnecessary?
So, no control valves at all or what?
How do you then, for example, make the bedroom cooler than the rest? Or is that idea already naive? Visually, I don’t mind wall thermostats, but from a technical or efficiency point of view, what is the advantage here?
...The flow rates are adjusted differently depending on the room. Of course, over time the rooms would equalize due to thermodynamics, but if the doors are mostly closed, the differences remain noticeable despite minor heat losses through the building envelope. I can say this from my own experience: I have two wall-mounted radiators in the kitchen-living area and underfloor heating under tiles in the bathroom. My bedroom doesn’t have any heating at all.The bathroom is somewhat warmer, the bedroom clearly cooler. After some testing (a change ;-) to the flow rates, I am fully satisfied. We only installed one ERR in the utility room to have the option to turn the heating completely “off” or “on” if needed. But basically, it’s money wasted; I don’t think we will ever need to use it.
Even a particularly responsive underfloor heating system is slow. Changes are often only noticeable after 2-3 hours. Adjusting ERRs doesn’t lead to better efficiency.
Juicy1990 schrieb:
So, no balancing valves at all, then?Exactly, because we all want efficient homes.D
Daniel-Sp14 Apr 2022 23:14Pwnage619 schrieb:
This could already be a problem since it is a developer project.
The developer told us that the ERR also responds to temperature, so for example, if a window is open, the underfloor heating will heat more strongly.
Our underfloor heating is supposedly "quick-reacting" for underfloor heating.
That’s how the consultant explained it to us. The developer’s consultant has no clue or is advising against better knowledge.
The room cools down so quickly with an open window that no underfloor heating can compensate by adjusting the ERR. Unless very high supply temperatures are used. But then you won’t want to walk barefoot around the room anymore.
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Benutzer20019 Apr 2022 10:01Hausbau 55 schrieb:
You will understand that I can’t fully believe everything you say. Why are you then here in the forum if you don’t believe anything? Do you need photos of the last heating system or what do I have to do to be credible?
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