ᐅ Does a masonry heater make sense in a KfW40 Plus house?

Created on: 10 Mar 2016 11:14
B
Bau.Joe
Hello,
we are currently building a KfW40 Plus house. The house will be so well insulated that we will need a maximum of 15 kWh/m² (1.4 kWh/sq ft) heating energy per year.
At the moment, we are considering whether to install a nice fireplace. The issue is that it requires a high-quality masonry heater or storage fireplace, which releases only a small amount of energy immediately and stores the rest, then emits it evenly over many hours as radiant heat.
We have two quotes so far, ranging from 15,000 to 20,000 euros per fireplace. The negative pressure monitor, which is also necessary (we have a ventilation system), is not yet included in this cost.

My question is: who has a very well-insulated house and a fireplace? How often do you actually use it? Do you experience any problems with overheating in the rooms?
What is your opinion on this? Should we plan for it or leave it out?
J
jochi79
20 Mar 2016 12:21
Great, thanks a lot already.
This should actually be doable DIY, since it’s basically standard drywall construction as you describe it.
Of course, with inspection and connection by the chimney specialist/heating engineer when using a water-based system.
T
tutterchen
20 Mar 2016 17:31
Here is another example from me. The total cost was about 1000€ above that of nordanney (excluding chimney, roofing sheet metal work, and steps). The insert used here is a Panorama 51/66/50/66 from Brunner. The chimney is not water-jacketed and doesn’t make financial sense with current wood prices anyway. So, it is purely for comfort and enjoyment. It was built by the chimney specialist using fireclay bricks, with a masonry back wall. Our tiler used our floor tiles for the tiling, and our painter and decorator did the plastering. We basically use it as a room divider in the living room, and it is currently burned about 3-4 times a week. The temperature increase is around 3-4°C (5-7°F) with moderate firing (starting temperature about 21-22°C (70-72°F)). We don’t have a pressure monitor. The stove installer recommended one, but the chimney sweep waived it. Fresh air supply comes through an air duct under the floor slab.

Cozy living room with decorated Christmas tree and burning stove.


Modern living area with stove, wicker chair, plant, and glass sliding door to the kitchen.
T
T21150
20 Mar 2016 20:09
tutterchen schrieb:
Here is another example from me as well. The price was about €1000 (approx. $1100) higher overall than that of nordanney

Your fireplace is wonderful! Absolutely fantastic!!! Respect. Best regards, Thorsten