ᐅ Is a wood-burning stove just a gimmick when you have underfloor heating?
Created on: 28 Aug 2019 17:26
H
Heidi1965
We are planning a new build with underfloor heating powered by a heat pump.
We would also like to have a wood stove in the hallway. The installer said such a stove is just an addition for show and wouldn’t save any energy at all. Since the new build will be very well insulated, it would have to be a really small stove. When you light it, it would take a long time for the slow-reacting underfloor heating to register the added warmth; by that time, the house would already feel too hot.
Is this really the case? I thought that any heat generated by the stove wouldn’t need to be purchased as external energy. I have a large stock of firewood here.
Also, is a stove compatible with an automatic ventilation system for supply and exhaust air?
We would also like to have a wood stove in the hallway. The installer said such a stove is just an addition for show and wouldn’t save any energy at all. Since the new build will be very well insulated, it would have to be a really small stove. When you light it, it would take a long time for the slow-reacting underfloor heating to register the added warmth; by that time, the house would already feel too hot.
Is this really the case? I thought that any heat generated by the stove wouldn’t need to be purchased as external energy. I have a large stock of firewood here.
Also, is a stove compatible with an automatic ventilation system for supply and exhaust air?
For a controlled residential ventilation system, you need:
a room air-independent stove (RLU) certified according to DIBt
a fresh air supply for the stove (either through the floor or via a double-walled chimney)
a pressure monitor (cost us about €2000 – we got overcharged. It requires some serious structural work and can only be installed during the construction phase) that measures the difference between indoor air pressure and the exhaust air pressure, and shuts off the ventilation system if there is a difference. (However, all of this is decided by your local chimney inspector. No, you have no choice during the initial inspection. Yes, the chimney inspector is like a god to you, his word is law, yes, it may work differently elsewhere, no, do not argue with your chimney inspector.)
We have the Justus Reno R stove. It costs about €1000, is RLU-certified, and weighs around 220kg (about 485 lbs), so it’s much more of a storage stove compared to cheaper units. Of course, it’s no comparison to a masonry stove made from half a ton of stone. Additionally, you can unscrew the stone cladding, allowing transportation of the stove itself with a hand truck (then it weighs only about 100kg (220 lbs)). The installation is arranged through Toom or other hardware stores that offer tradesman services—it cost us €700 (due to the required calculations demanded by the chimney inspector; without these, it would have been €200).
Since we have a photovoltaic system and can track very accurately via the app when the heating turns on and off, yes, the stove reduces how often the heating system needs to start. I calculated this once: from around -6°C (21°F) and below, the stove running on wood briquettes costing €199 per ton (~2200 lbs) is more economical than the air-to-water heat pump.
Yes, the stove can run continuously if you keep it going all day, which means the heating system doesn’t run at all.
However: the room where the stove is located stays comfortably warm at 26-27°C (79-81°F), the upper floor stays around 22°C (72°F), and the stove room is 75 m² (about 807 ft²)...
All in all, it cost about €12,000. It adds a nice atmosphere and, in case of a power outage in winter: well, I have 300kg (660 lbs) of lignite coal in the basement… so I don’t care :P
a room air-independent stove (RLU) certified according to DIBt
a fresh air supply for the stove (either through the floor or via a double-walled chimney)
a pressure monitor (cost us about €2000 – we got overcharged. It requires some serious structural work and can only be installed during the construction phase) that measures the difference between indoor air pressure and the exhaust air pressure, and shuts off the ventilation system if there is a difference. (However, all of this is decided by your local chimney inspector. No, you have no choice during the initial inspection. Yes, the chimney inspector is like a god to you, his word is law, yes, it may work differently elsewhere, no, do not argue with your chimney inspector.)
We have the Justus Reno R stove. It costs about €1000, is RLU-certified, and weighs around 220kg (about 485 lbs), so it’s much more of a storage stove compared to cheaper units. Of course, it’s no comparison to a masonry stove made from half a ton of stone. Additionally, you can unscrew the stone cladding, allowing transportation of the stove itself with a hand truck (then it weighs only about 100kg (220 lbs)). The installation is arranged through Toom or other hardware stores that offer tradesman services—it cost us €700 (due to the required calculations demanded by the chimney inspector; without these, it would have been €200).
Since we have a photovoltaic system and can track very accurately via the app when the heating turns on and off, yes, the stove reduces how often the heating system needs to start. I calculated this once: from around -6°C (21°F) and below, the stove running on wood briquettes costing €199 per ton (~2200 lbs) is more economical than the air-to-water heat pump.
Yes, the stove can run continuously if you keep it going all day, which means the heating system doesn’t run at all.
However: the room where the stove is located stays comfortably warm at 26-27°C (79-81°F), the upper floor stays around 22°C (72°F), and the stove room is 75 m² (about 807 ft²)...
All in all, it cost about €12,000. It adds a nice atmosphere and, in case of a power outage in winter: well, I have 300kg (660 lbs) of lignite coal in the basement… so I don’t care :P
Lignite coal... Oh dear. Better not let the green crowd read this @fragg!
Basically, it works, and I do it almost the same way with wood plus water circulation. But: in the cost-benefit analysis, a stove like that ranks quite low, as long as the standard home systems are functioning. Anyone doing this for self-sufficiency reasons will need a lot of idealism, because as soon as you have a controlled ventilation system, you also need control technology for the stove. However, that also only runs on electricity...
Basically, it works, and I do it almost the same way with wood plus water circulation. But: in the cost-benefit analysis, a stove like that ranks quite low, as long as the standard home systems are functioning. Anyone doing this for self-sufficiency reasons will need a lot of idealism, because as soon as you have a controlled ventilation system, you also need control technology for the stove. However, that also only runs on electricity...
Domski schrieb:
As soon as you have a mechanical ventilation system with heat recovery included, you need control technology for the stove. But that also only runs on electricity...um, yes, but the mechanical ventilation system does as well??? Power outage – monitor off – mechanical ventilation off – all good
Domski schrieb:
Something has to switch the controlled residential ventilation system on and off again. That also requires power. And the burn control in the stove as well.My stove has a lever for that. I turn it to 9 o’clock, and then some kind of bimetallic component works together with the air control.Similar topics