Why doesn't my stove keep up?

Is your stove not working properly? This is how you go on a bug search

Dirty stove windows ?!

A common problem with wood-burning stoves and with Fireplaces with glass doors. The exhaust gases condense on the (relatively) cold pane and blacken the inner surface.

Light a fire in the stove:

Put that firewood all the way back against the back wall. Always place the logs across the oven, never with the face to the pane (most of the wood gas escapes at the face!). Use only dry untreated wood (no wood waste). Well-designed wood-burning stoves and pellet stoves cleverly prevent the panes from blackening preheated combustion airwhich is guided along the window from the inside (Secondary air). This system only works if the Primary air (Air flow through the ash drawer to below the flame) is throttled or closed completely. The primary air only remains during the Heat-up phase open. Sometimes even these tips are of no use:
Then your stove is either leaking (“false air” whistles uncontrollably through the doors and ash drawer into the combustion chamber) or your stove is structurally not equipped with a functional “window flush”:

Secondary air valve in the area of ​​the window frame of a Fireplace allow only cold air curtains to reach the pane and usually only keep the pane transparent in places. There are also ovens where the secondary air cannot be regulated. Only one can help here Throttle valve in the exhaust pipewhich prevents uncontrolled burning of the fuel if the chimney draft is too strong. Some stove manufacturers do not use secondary air control at all. These stoves are hardly suitable for burning wood (more for briquette and coal) and are usually not equipped with a glass door.

Smoke when adding wood?

This is a common problem with stoves with large door openings. If you open the door during operation, the chimney suddenly has to convey eight times the amount of air in order to get one in the entire door opening area Generate negative pressure. The chimney or Stainless steel chimney is only able to do this if he has a sufficient cross-section and has sufficient effective height. Before buying a stove, you should therefore have a chimney sweep check whether the chimney is suitable for you Fireplace stove with panoramic window (free cross-section with the door open over 1200 cm2) is suitable. If this is not the case, you can switch to ovens with a split or smaller door. If you already have the "wrong" stove in your living room, the following tips can sometimes help:

  • Check whether a possibly existing throttle in the connection piece in the correct position (open) stands.
  • First open the door a crack and wait a few seconds, then slowly open the door as far as necessary and add the wood.
  • Put the wood all the way in back across into the combustion chamber, use a pair of pliers.
  • Basically affects vertical smoke outlet upwards has a more positive effect on the function of a stove than an exit towards the rear.
  • Check that the connector between Stove and chimney is clean.

Our tip:

Please open the door very slowly to minimize turbulence and the associated escape of smoke gases. As soon as the pressure has equalized, your stove can usually be opened completely without any undesirable side effects.

Stove does not work?

The cause is usually a dirty connection piece of the Smoke pipe or on chimney. Check whether any throttle valve in the connection piece is in the correct position (open). When heating up, smoke often pushes back because the chimney has not yet received any heat. A chimney "Pulls" only when it is warmer inside than outside. In particular, chimneys that have been raised on the outer wall first need a little "upswing".
Grandma’s home remedies can help in an emergency:
Put some paper in the lower cleaning opening and light it. Then you can use the buoyancy that has just been generated for the heating process. It is possible that the cross-section of the chimney is not sufficient or the stove door is too large (see above: smoke when adding more wood).

Our tip:

Talk to your chimney sweep about this the next time you sweep.

The stove gets too hot, does the wood burn too quickly?

Most stoves have one Heat output from approx. 6 - 8 kW. Much too much for an average living room of 30 m2 (heat requirement in a new building at -10 ° C = around 2 kW). The result is a room temperature of 30 ° C and more. You should try, to put on less wood and keep the flame small. The problem may also be with your stove:
If the Door seals or the window frame is leaking, the Fireplace stove no longer throttle properly. If the window rattles when you tap it, the sealing frame must be tightened. The door seal is a wearing part and should be checked regularly for functionality. The door handle should firmly engage the door when it is locked poetry to press. The Ash drawer must seal completely at the stop. If all else fails, the door may be warped or the stove has large manufacturing tolerances. This problem often occurs with very simple wood-burning stoves with low Quality requirements on.

Does the wood not burn completely in the stove?

After the fire has gone out, there are often still unburned pieces of wood in the firebox. There are two reasons for this:
Most of the time it was firewood not quite dried outwhen it was thrown into the fire. Then only the part burns that was directly in the embers of the existing fire. The rest goes out as soon as the additional heat source dries up (see also wood storage).
Another cause can be either the construction the fireplace or a Incorrect operation be:
Wood should be used in the combustion if possible, get no air from below (over the grate). The pieces of wood are literally burned away as soon as they are directly over the grate. The ends remain unburned afterwards. That is optimal Burning in a bed of embers (like with a campfire). The Combustion air comes from above and from the sides. To the Heating up you usually have to add air from below (primary air) so that the wood burns. Then you should close the lower air supply as quickly as possible and only regulate with the secondary air (air from above). With good wood-burning stoves, the pane also stays clean.

Our tip:

Let them Wood scraps lie in the fireplace. They usually fancy a optimal ember bed for the next heating process.

Firebricks broken?

In the fireclay of Stoves and fireplaces Thin cracks often form. This is normal considering that at the Fireclay temperatures of over 600 ° C can arise. The high temperatures ensure optimal Post-combustion of the exhaust gases and prevent condensation and tar formation in the combustion chamber. It only becomes critical when parts of the fireclay come off and fall into the oven. This can lead to damage to the jacket of the fireplace or (in the case of chimneys) to excessive heating of the rear walls of the building.

Our tip:

In this case, have someone leave the fireplace immediately Check specialist.

Of course, we are available for questions about the topic Fireplace stove and pellet stove gladly available.