Fireplace and underfloor heating - is air circulation or storage more sensible?

  • Erstellt am 2021-11-21 17:36:56

erazorlll

2021-11-21 17:36:56
  • #1
Good day dear forum,

we have planned a masonry fireplace stove in our new building as a separation between the living room and dining room.


(the planned fireplace extends further into the room, not as in the current plan)

The primary goal is purely aesthetic aspects (fire) and a corresponding feel-good atmosphere. Heating is secondary since we have underfloor heating. Additionally, there is controlled ventilation. I am aware of the cost vs. benefit issue and that it is purely a luxury object.

The room where the stove will be installed is about 50m² with large window areas.

I have repeatedly read about problems of overheating in the rooms when the stove is oversized or if there is underfloor heating at the same time. Opening the window for that does not really make sense.

Now I have received offers from two stove builders who gave me different statements and would build the fireplace differently.
Option 1: 12kW as a circulating air fireplace (draw air in, lead it past the stove and warm it, then release it back into the room) and additionally fireclay bricks for storage
Option 2: 11kW as a storage fireplace with fireclay bricks without any circulating air/air guidance.

Both fireplaces are very powerful at 11 and 12kW? I have addressed the overheating issue with both providers.
Option 1 says that with the air guidance, the room can be heated very quickly if the outside temperature drops and the underfloor heating cannot keep up quickly enough. The storage bricks then release the heat when the fire is out again. If done without circulating air, the fireplace would be ineffective because it takes too long until it gets warm. Overheating would not be a problem.

Option 2 says that the underfloor heating heats sufficiently and therefore the circulating air variant would heat and overheat the room too quickly. The storage fireplace would emit heat slowly and evenly, thereby preventing overheating. The glass pane of the fireplace would release enough heat for short-term needs, so no additional circulating air is needed.

Now I naturally ask myself: who is right or which is the more sensible solution?

Thank you for your assessment and help.
 

Benutzer200

2021-11-21 21:33:26
  • #2
If only appearance, then at most fan-forced heat and preferably no storage stones.

We had a see-through fireplace with more power, but also a 75 sqm living/dining area. Fire on, temperature slightly high (max. +3 degrees in the evening), most of the heat through the chimney. Everything relaxed.
 

ypg

2021-11-21 22:30:51
  • #3

Yes, completely!
I am not familiar with this recirculation system, but I hope you can still get something out of my post:

I consider that nonsense: an underfloor heating system doesn't have to "power up all at once," so it can't keep up or falls behind. It runs continuously with an outdoor sensor, so it always gets comfortably warm.

And when do the stones release the heat? Exactly, when you go to bed. (Underfloor heating is not turned off)

Overheating is when you heat a room with too many kW. That is almost always the case with an additional fireplace.

Even in this case, you have an additional heat source in the room that releases more heat than you need at that time.
We have 50 sqm of living space with a large open space to the upper floor. With our 7 kW fireplace, we practically heat the whole house, meaning all accessible rooms additionally. Since the fireplace is operated depending on the situation, you will not intervene much in the underfloor heating, so you cannot avoid briefly ventilating or going out to the terrace if there is too much heat during operation. In your case, the room is also closed—you will open all the doors ;)
What’s the point: the comfort factor makes it warm, and to avoid overheating you have to do something manually. Storage stones might be nice, but they store heat for the night, and you don’t need the additional heat then.
I consider further additional technology for a comfort fireplace to be a waste of money, as well as an oversized fireplace.
 

KingJulien

2021-11-22 06:32:58
  • #4
But there are worse things than leaning against a still nice and warm stove in the warm living room/kitchen in the morning ;)
 

ypg

2021-11-22 06:51:08
  • #5
Yes, get ready and go to work….
 

Snowy36

2021-11-22 06:55:56
  • #6
So we have variant two and are very satisfied with it. On the one hand, it is indeed the case that during the transition period the underfloor heating cannot keep up… It simply says outside it’s still too warm to turn on, and when it finally does turn on it needs some time to warm everything up; during this time I, as a woman, have frozen my butt off. Just turn on the stove and that’s it.

I do find the storage stones very useful because they absorb some of the heat and it doesn’t suddenly become 800° in the room.

My father has a normal Swedish stove in his KFW 55 house and you can’t stand it when you turn it on.
 

Similar topics
22.08.2014Underfloor heating or not?20
22.12.2014Ceiling heating, wall heating, or underfloor heating?18
05.11.2014Underfloor heating Yes or No?32
27.11.2014Questions about underfloor heating with geothermal energy40
18.01.2015New construction Kfw70 underfloor heating and tiles11
06.11.2015Set controlled residential ventilation KFW 70 with underfloor heating18
20.03.2015Tiles, vinyl, or other types of flooring with underfloor heating?23
20.10.2016Water-bearing fireplace stove floor heating, heat pump, photovoltaic, new construction?28
27.11.2015Control climate with underfloor heating or via the ventilation system?66
07.10.2016Control floor heating19
01.11.2017Underfloor heating - Better to install tiles or laminate?28
27.12.2017Underfloor heating heating demand with at least 60 mm screed30
12.01.2018Fitting 3 rooms in a 40 sqm living room. Ideas74
25.01.2019The underfloor heating is not turning on in one room27
20.12.2019Underfloor heating in the children's room? Some rooms planned without underfloor heating? Air-to-water heat pump removed?48
09.10.2020Upgrade underfloor heating with actuators and wireless receivers33
10.04.2022Solid wood parquet on underfloor heating101
22.02.2021Insulation of the ground floor / if applicable, underfloor heating12
10.11.2021Is underfloor heating in the basement useful??60

Oben