Wamsler K158 User manual

1
Central Heating Cooker
Operating and
Instruction Manual
GB
K158 K158F

35
GB
Foreword
Dear Customer,
Congratulations on the purchase of your central heating stove K158/K158F. You
have made the right decision, this product guarantees you:
•High quality by using the best, tested materials,
•Functional safety by using proven technology, tested to the most stringent
German and European Standards (EN 12815),
•Long life by being built robustly.
The K158/K158F central heating stove means you now own a modern compact
unit to:
•cook, bake, roast,
•centrally heat and
•provide hot water
The unit is energy saving, environmentally friendly and simple to use. Everything
you need to know about it is in the following pages plus a few additional tips as
well.
Please take note of the fact that installation may only be carried out by a qualified
expert, who will also be available later should you experience any problems.
The nameplate is on the left front foot and becomes visible if the fuel trolley is
pulled out (Fig. 12).
PLEASE NOTE:
When ordering replacement parts, the Article No. and Serial No. shown on the
identification plate must be quoted.

36
Contents
Foreword...............................................................................................................33
Contents................................................................................................................36
Assembly...............................................................................................................37
Legend..................................................................................................................38
The most important at a glace ..............................................................................38
1. OPERATION.....................................................................................................39
1.1 Commissioning an integral stove................................................................39
1.2 Important operating parts ...........................................................................39
1.3 Lighting.......................................................................................................40
1.4 Heating and slow burning...........................................................................41
1.5 Heating between seasons and during the summer....................................41
1.6 Cooking.......................................................................................................41
1.7 Care and cleaning ......................................................................................42
1.7.1. Ceramic glass surfaces ..........................................................................41
1.8 Causes of faults..........................................................................................43
2. ARRANGEMENT..............................................................................................44
2.1 Fire safety...................................................................................................44
2.2 Chimney attachment...................................................................................44
2.3 The heating stove for open and closed systems........................................45
3. INSTALLATION ................................................................................................47
3.1 Installing the top lid.....................................................................................47
3.2 Flue gas connector direction ......................................................................47
3.3 Installation of the heat exchanger and the heat sink..................................47
3.4 Installing the stove bar................................................................................47
4. INSTRUCTIONS...............................................................................................48
4.1 General information....................................................................................48
4.2 Important Notes..........................................................................................48
4.3 Integrating in an existing unit......................................................................50
5. TECHNICAL DATA...........................................................................................51
5.1 Fuel.............................................................................................................51
5.2 Heating output data ....................................................................................52
5.3 Dimensions, output values, flue gas values ...............................................53
5.4 Dimensional drawings ................................................................................54
5.5 Brief instructions.........................................................................................55
6. FIGURES..........................................................................................................55
7. SAFETY MEASURES.......................................................................................61

37
Assembly K158
1
9
2
6
4
8
7
13
5
3
10
12
11
K158F

38
Legend
1. Top lid
2. Ash pan
3. Ash door
4. Fuel trolley
5. Fire door
6. Fire hole cover
7. Hotplate
8. Crank for raising and lowering grate
9. Grate door
10. Riddle bar
11. Secondary air slide
12. Temperature control
13. Fire door grip
Stove accessories
-Ash pan
-Operation instruction
-Lid lever
-Crank
-Smoke hole cover pair complete
-Cleaning brush
-Soot scraper
-Fire iron
The most important at a glace
The stove should on no account be heated up if there is no water or insufficient water in
the heating unit or the unit is frozen up.
- The ash door should only be open when heating up. While heating the door must
always remain closed, as otherwise the temperature control cannot regulate the per-
formance and there is a danger of the stove overheating.
- The maximum operating pressure of 2.5 bar in the heating unit may not be exceeded.
That is the response pressure for the safety valve.
- When adding water to the heating system attention must be paid to the pressure limit
of 1.5 bar (cold) or 2.0 bar (hot).
- Only use suitable recommended low smoke fuels and do not burn any smoke inten-
sive waste, coal slack or fine chippings.
- When the grid is in the "DOWN" position (winter setting) fuel should only be added to
the fire box in small amounts at a time.
- Do not allow the hotplate to glow and avoid cooking over.
- The chimney draught for full operation should not be below 12 Pa. If there are too
greater draughts in a single chimney then side air vents should be incorporated.

39
IMPORTANT
Side air vents on chimneys with more than one stove connected not allowed.
- Clean stove, flue and chimney regularly.
- Do not lay any flue pipes horizontally for more than 1.25 m.
- Do not reduce flue pipe diameter from pipe connection to the chimney.
- Window and doors of the base frame should not be completely airtight because of the
need for combustion air intake.
- Pay attention to fire safety when erecting the stove and laying the flue pipes.
- Before operating the stove for the first time be sure to check the chimney equipment
according to the instructions, or have it checked.
- Press the red button on the heat sink down firmly from time to time, to check the
through flow functions. If the water flow draining out is becomes obviously weaker,
then an expert must contacted to decalcify the heat exchanger.
- Do not use paper to light the stove; it creates an environmental pollution danger.
1. OPERATION
1.1 Commissioning an integral stove
If the heating stove is to be integrated into an existing central heating system and the oil or
gas cooker is to remain in place to cope with peak demand, then the stove can be oper-
ated as required. The oil or gas cooker, as a rule, only heats the domestic hot water while
the stove is heating up and should therefore have a flue gas flap to avoid unnecessary
idling losses.
The cooker should be turned off
If the oil or gas central heating cooker is not connected, then the return bypass on the
cooker should be set so that the domestic water cooker usually installed or the storage
cooker next to it can be supplied with heat – that is if the stove is integrated after the mixer
and not between the cooker and the mixer.
The domestic water temperature is then directly dependent on the flow temperature. The
latter is also the case for the preferred arrangement between mixer and cooker or direct
connection of the heating stove to the flow and return lines of the existing heating cooker.
In all cited installation cases, the cooker should have a safety valve.
1.2 Important operating parts
Grate crank
The height of the grate can be altered for winter or summer operation.
The crank supplied (8) is used for raising and lowering (Fig. 4 and 5). The summer opera-
tion (grate position "UP", Fig. 4) ensures a high cooking capacity while at the same time
low water heating capacity.
Grate door (9)
At the "DOWN" winter position, the grate door is used for lighting and for removing cinders
and slag. The grate door can be opened by turning the catch (Fig. 6 and 7).

40
Riddle arrangement
The grate can be riddled in any height position using the riddle bar (10). If it hot then the lid
lever can be used (Fig. 8).
Please do not tip any glowing ashes in the dust bin or outside.
Temperature controller (12) The Temperature control regulates the rate of burning
through the air intake and thereby the stove's heat level.
Fire hole cover (6) The fire hole cover can be lifted with the lid lever and fuel can be com-
fortably added from above (Fig. 10). The fire hole cover is the hottest part of the hotplate.
Secondary air slide (11) The air intake for the winter position of the grate can be regu-
lated by the secondary air slides for afterburning the flue gases. Keep the slide closed for
summer setting (Fig. 11a).
Fuel drawer (4) The fuel trolley is on rails and by lifting can be taken out completely (Fig.
12).
Please hold the recessed grip in the middle under the edge.
ATTENTION
Do not store easily combustible material (paper etc) in the fuel drawer.
INSTRUCTION
The ash door or the fire door may be opened or closed during operation using the protec-
tive glove (Fig. 13).
1.3 Lighting
At "DOWN" grate position (winter setting)
Leave the ash door, the heating door and the grate door open, using a coal lighter or wood
shavings and small firewood and lay them on the grate. Light through the grate door and
shut the heating door (Fig. 14).
When the wood is burning well, add fuel through the heating door. Only close the ash door
after about 5 minutes and open the secondary air slide. The required heat level can now be
selected on the temperature controller (12).
When the grate is in the "UP" position (summer setting)
The procedure is identical to when it is in the "DOWN" position but it is lighted through the
heating door (Fig. 15). If the outside temperature is over +15 °C smoke could come out
because of the low chimney draw. A kindled fire with wood shavings in the chimney as a
pilot fire can help.
ATTENTION
In the interests of air pollution prevention no paper should be used when lighting
and the combustion chamber should be fuelled with two to three charges at inter-
vals of 10 to 15 minutes and not all at once.
WARNING
When the heating stove is operating, any air/moisture extractor must be switched off
in the room where the stove is installed. Danger of extracting flue gas from the
stove.

41
1.4 Heating and slow burning
Heating with wood
- Secondary air slide (11) "OPEN"
Lay long and thick pieces of wood in at least two charges on thick embers. Split firewood
improves the burning quality and controllability. Hardwood is more productive than soft-
wood. If the chimney draught is not sufficient (possibly high outside temperature) and the
up draught regulated by the temperature controller, the ash door can be left open for a
short time after the wood has been put on, to get the fire going.
Slow burning with wood
The burning speed is so set using the temperature control (12), that the required tempera-
ture is maintained.
Using wood, particularly softwood, it is only possible to have limited slow burning.
Heating with coal
-Secondary air slide (11) "OPEN"
-Only add coal after a strong basic ember glow is established and then in at least two
charges with a period of about 15 minutes between each.
1.5 Heating between seasons and during the summer
If the chimney draught is poor because of high outside temperatures, then the flue gases
cannot be drawn off completely.
Therefore:
- put on less fuel,
- do not turn temperature controller back too far and
- riddle more often, to keep the draught in the stove going
1.6 Cooking
Please only use pots with solid flat bottoms and lids that fit.
Cooking in winter
- Grate position "DOWN"
- temperature control to "3"
- secondary air slide "OPEN"
During the colder times of the year, the stove will mostly be used to heat and prepare do-
mestic hot water, whereby is still possible to cook immediately above the fire itself. To
cook, add wood and/or coal in small charges to create a high level ember bed, which will
heat the hotplate adequately.
After cooking, turn the temperature regulator back to the desired temperature.

42
Cooking in summer
- Grate position "UP"
- temperature control to "3"
- secondary air slide "OPEN"
At the warmer times of the year, the stove will mostly only be used to cook, and prepare
domestic hot water. Here the "UP" grate position is used, to ensure that the room where
the stove is and the hot water tank do not become excessively overheated.
If the hotplate is not hot enough, the ash door can be opened as an exception. If the heat
capacity of the domestic water boiler is exceeded then the excess energy is let off through
the heat sink (closed circuit).
This must not be allowed to be a regular operating situation; otherwise it will lead to
rapid furring up of the heat exchanger
1.7 Care and cleaning
The period of time between cleaning the stove and the flue pipes depends largely on the
type of fuel used, the draught and the mode of operation. It should certainly be cleaned if:
- heating performance drops,
- the fuel burns poorly despite powerful air intake (open ash door),
- smoke occasionally comes out (flue gas smell in room) or
- the period for heating is over.
- Unnecessary dust escape can be avoided if all openings on the stove remain closed, if
they are not actually being used as accesses to clean through at the time.
- Take the hotplate out (Fig. 16) and clean out the chimney connection (Fig. 17). The
hotplate can remain in place for the upper smoke connection.
- Clean the ducts from top to bottom using the soot scraper and brush through after-
wards (Fig. 18)
- To clean the left and right draught ducts:
- remove the ash pan and
- push cleaning slides to the back of each using the fire iron (Fig. 19 & 20)
1.7.1 Ceramic glass surfaces
Clean the window and/or Ceran plate before first use with a clean damp cloth. Then rub a
few drops of a ceramic glass protection product onto the glass / Ceran plate with a paper
towel.
After wiping this and polishing it dry, the high quality surface is now covered with an invisi-
ble film. The helps to keep the glass pane /Ceran plate clean and if repeated regularly,
makes it easy to clean

43
1.8 Causes of faults
Your stove is built to the latest technical know- how. Nevertheless faults may occur, which
are caused by the chimney, fuel or the heating and plumbing.
Fault
Check / Rectify
Stove smokes
-in summer
-in winter
-when commissioning
- open the ash door briefly. High outside temperatures
cause poor chimney draught.
- warm up chimney with a paper fire in the chimney or
warm up in stove.
- open the ash door briefly.
- do not use damp or smoke intensive fuel.
- fill the fire box slowly, bit by bit.
- when was the stove last cleaned?
- a short period with some smoke when the stove is first
commissioned is quite normal and will soon disappear.
Stove does not draw properly
- is the draught from the chimney too weak?
- is the pipe connection from oven to chimney leaking?
- are all cleaning doors on the chimney and on the stove
properly closed?
- is the fresh air intake guaranteed in the room where the
stove is installed? Doors and windows should not be abso-
lutely air tight.
- is the chimney leaking or overloaded?
To little heat when cooking
and roasting
- is the temperature control set at "3"?
- briefly open the ash door.
Too much heat when cooking
and roasting
- is the temperature control turned down?
- add less fuel.
Operating temperature not
reached
- was energy rich fuel used (Fuel)?
- is the installation properly dimensioned?
- was enough fuel added?
Grate jams when riddled
- has slag been removed?
- have nails or building timber possibly got jammed?
Bubbling sounds
- are the radiators turned up?
- has the circulating pump broken down?
- is the installation ventilated?
Heat sink actuated
- is the ash door closed?
- if necessary wind the grate up.
Condensation water in stove
- is the fuel too damp?
- is the return water temperature too low?

44
2. ARRANGEMENT
For installation and for connection of flue, the requirements of the Fire Regulations (FeuVO
in Germany) apply, as well as local building regulations such as the following technical
standards DIN 4705, EN 13384, DIN 18160, EN 1856-2, EN 12828, EN 12831, EN 12897
and EN 15287. In order for the stove to function correctly the chimney to which you want to
connect the stove must be in good condition.
NOTE
The room must reach the so-called room capacity ratio of 4 m3per kW nominal heat
capacity. If this is not possible, then it has to be connected to other rooms on an air
flow sense, i.e. with rooms with outside doors or windows and air vents in the con-
necting doors or walls to the installation room.
2.1 Fire safety
All flue pipes must be capable of withstanding up to +400 °C.
If the stove is to be installed on a floor of combustible material such as wood or plastic etc.,
then a floor plate must be installed which is larger than the footprint of the stove from the
fire door to each side by at least 30 cm and to the front of the fire door by at least 50 cm.
The walls to the sides and back of the stove cannot be of combustible material nor can
they be clad in combustible material, where the distance is less than 20 cm from the stove.
The bottom edge of wall cupboards above the stove must be at least 70 cm above the
hotplate surface. The side distance from wooden or plastic furniture parts must also be
more than 20 cm. These safety distances can be reduced to 10 cm if the special distance
connections are also supplied.
Care should be taken that the smoke pipe is at least 40 cm from combustible building
materials such as wooden or plastic cladding or door frames or wallpaper. This distance
can be reduced by half, if the smoke pipe is insulated so that any part of the building is
prevented from being heated to above +80 °C.
In addition local building regulations have also to be complied with.
2.2 Chimney attachment
The connecting pipe between the stove and the chimney should have the same cross
section as the pipe connection on the stove. The chimney cross section should be consis-
tent and as far as possible square or round. House chimneys should be insulated.
This applies particularly to the smoke pipe and sheet metal chimneys. They should be
provided with good heat insulation at points where there is the possibility of being exposed
to cooling. Modern chimneys from prefabricated parts or multilayer construction are pre-
ferred, in as far as they are approved by the local building authority. Horizontal smoke pipe
runs of over 0.5 m long must rise by ten degrees to the connection with the flue. Pipes
which are not heat protected or are not vertical, should not longer than 1.25 m.
The effective flue height from the middle of the pipe connection to the top of the chimney
must be at least 5 m.
Should the height be less than the stove must be connected to a vertical flue pipe which is
not less than 1 m in length.

45
Connecting to a flue of less than 4 m is not permitted by law.
As the chimney stack draught depends on a number factors, a side vent device can be
inserted at least 40 cm above the base to avoid overloading the fire and to avoid soot build
up. Side air devices can only be introduced into rooms where burning stoves are installed.
If there are a number of fire points in different rooms with a common chimney stack then
they are not permitted.
In addition to the points listed here, notice should be taken of DIN EN 13384, DIN
18160, EN 1856-2 and EN 15287.
The necessary combustion air can only be fed to the stove and the flue gases removed
through the chimney if an air exchange of at least 0.8 times per hour is guaranteed (doors,
windows, air duct).
Before connecting the stove seek advice from a chimney sweep.
2.3 The heating stove for open and closed systems
Heating stove model K157/K158 is only allowed to operate with heat sink in closed sys-
tems according to EN 12828, EN 12831 and EN 12897. If it is connected to an open sys-
tem then our guarantee for corrosion damage becomes invalid.
Heating stove model K157/K158, is suitable for open systems if a heat exchanger for the
heat sink is incorporated.
Further directions on central heating units are given in section 4.
Heating stoves for solid fuel can only be operated in closed systems with a flow independ-
ent heat sink with the safety valve mounted above the stove set at 2.5 bar.
The heat sink has to work in conjunction with the heat exchanger with large fires and low
heat loss of heating and domestic water which does not exceed the permissible highest
value of pressure in the heating pocket. The safety valve must therefore be checked regu-
larly. This is done by depressing the red button for a short time. Water must pass through
the valve while this is happening.
ATTENTION
The stove may only be heated up (even in testing) if:
- it is connected to a central heating system completely filled with water and
- The functioning of the thermal safety valve and the safety valve have been es-
tablished and inspected, if it is connected to a closed system.
2.4 Spacer connection and accessories
If the stove is to be integrated in a fitted kitchen, then the interface to a floor mounted cup-
board with a counter has to have a spacer connection which can be supplied by the fac-
tory. The available spacer connections are tested to EN with the stove and comply with
building regulation requirements relating to fire protection.

46
Action in case of chimney fire!
If a chimney is not cleaned often enough, or if the wrong type of fuel is used (e.g. damp
wood) or the air flow is maladjusted the chimney may catch fire. In this case close the air
supply to the fire chamber and call the fire brigade.
Never try to extinguish it yourself using water!
Right
Wrong
min. 50 cm
min. 30 cm
Chimney diameter
reduced due to flue
being inserted too far
into chimney
min. 5 m
Lower than top of ridge
Blockage due to
exhaust gases
interfering with
each other
Air leak due to
pp
en doors on
stove which is
not in use
Air leak from
badly fited pipe
connection
Air leak from
open stove or
chimney door
Under
5 m
Air leak from open
pipe connection

47
3. INSTALLATION
3.1 Installing the top lid
The top lid hinge spigots are inserted evenly into the plug holes in the stove frame (at back,
left and right) (Fig. 23 & 24).
3.2 Flue gas connector direction
The pipe connector is factory installed at the back of the stove.
If a flue gas connection is required on the side, left or right, the following steps should be
taken:
- Remove the pipe connector at the back by undoing the three fixing bolts M4 (Fig. 25).
- Close the smoke hole with the pair of cover plates supplied (Fig. 26).
- The smoke hole cover on the side wall and the inside cover should be removed. The
inside cover can be removed by taking the hotplate off and holding the cover screw
out the bolt (Fig. 27)
- cut out the aluminium insulation with a knife (Fig. 23).
- Screw the previously removed pipe connector from the back of the stove on to the side
using the three bolt holes (Fig. 28)
- If the flue gas connection is to go up, then proceed as follows:
- remove the pipe connector and close the back smoke hole.
- Take the smoke hole cover from the hotplate (the best way is to lift the plate) and
attach the pipe connector firmly using the three visible bolt holes (Fig. 29 & 30).
- Keep the remaining covers in a safe place for possible use later.
3.3 Installation of the heat exchanger and the heat sink
The heat exchanger and the heat sink are not part of the standard scope of supply of the
central heating stove. If required it can be retrofitted. The following is required:
- Insert the heat sink probe in the fully into the immersion shell (Fig. 31).
- Clamp the protective tube firmly in the immersion shell (Fig. 32).
- To install the heat exchanger only the blind flange on the back of the stove needs to
be removed and the heat exchanger connected in its place (Fig. 33).
ATTENTION
The heat exchanger has to be firmly bolted to the heating pocket (Fig 34).
Screw thread bolts can strip if too much force is used.
3.4 Installing the stove bar
Two screws underneath the front on the stove frame are already installed for attaching the
stove bar (Fig. 35).
- open fire door
- unscrew screws
- lay one end of the bar on the fire door
- first screw the bar on at the other end
- for easier access to the screws, the two front covers on the left and right of the fire
door can be removed.
- there is a screw at the bottom of each of the covers which must be undone. (Fig. 36)

48
4. INSTRUCTIONS
4.1 General information
The following directions and instructions concern questions of fundamental importance. It
is further presupposed that the installer of a heating plant has the necessary technical and
craftsman's basic knowledge for the task. This is naturally also the assumption where the
stove is being incorporated as an integrated stove into an existing system.
Heating stoves with heat exchangers are only suitable for closed systems with a heat sink.
Stoves without heat exchangers should be used with a heat sink.
The regulations according to EN 12828, EN 12831 and EN 12897 apply.
We do however recommend using the external heat sink in conjunction with a domestic
water boiler even for open systems, to control the stove's boiling function when there is a is
a limited heating requirement of hot water.
4.2 Important Notes
The heating stove must be put in place using a spirit level to ensure correct adjustment.
Threaded pipe connectors, straight or angled, should be used to for the flow and return
connections. Sleeves fittings or welding should not be used.
Horizontal pipe exits from the heating stove are to be in 1"-diameter. Reductions can only
be made in vertical connections.
The filling and emptying cock should always be located at the lowest point of the system in
the return connection.
Up to a static height of 10 m, the capacity pressure expansion vessel is dependent on the
water capacity of the system as follows:
Water content Vessel size
Litre Litre
up to 111 12
112 - 167 18
168 - 231 25
232 - 324 35
325 - 463 50
464 - 741 80
There should no manually operable shut off valves installed between the expansion vessel
and the stove.
A ventilation section at least 0.5 m above the highest circulation point in closed systems
with a diameter of at least 1″should be arranged and a ventilation valve provided at the
upper end.
In gravity systems the rise and fall of horizontal pipes should be at least 0.5 cm/m.
Radiators with more than 25 ribs or plate heat exchangers over 1.5 m long should be di-
agonally connected to the flow and return pipes.

49
Where there is a lower distribution ventilating valve it must be provided on each radiator.
The radiators should not be inclined towards the ventilation. As radiators are usually at the
same level on the floor where the stove is installed, these radiators should all be connected
to a circulating pump as matter of course.
If however a pure gravity plant has to be executed without pumps, then the centre of the
radiator should not be lower than the centre of the boiler.
In the simplest installation case, the circulation pump is connected to the mains by a switch
and runs continuously during the heating period, while the water capacity of the stove is
regulated by an integrated temperature controller.
The pumps can however also be controlled from a maximum-thermostat in the domestic
water boiler, to ensure a minimum temperature for the domestic hot water.
It is also possible to switch the circulating pumps through a room thermostat. In this case
however the gravity circulating domestic water boiler should not have a capacity of less
than 260 l, if there are no other radiators on gravity circulation are connected.
Independently of the control types described above, the heating circulation and/or boiler
loading pump should primarily be controlled through a thermostat with a fixed switch on
temperature of between 50 and 55 °C, situated immediately at the stove's return flow con-
nection following an adjustable bypass close to the stove between the flow and return
lines, to avoid a low temperature operation of the stove boiler.
In the installation unit which can be supplied as an accessory there is a thermal boiler
monitor integrated as a continuous regulating valve. The pump controls mentioned above
are then not needed.
Care should be taken when calculating the heat requirement that not only the heat re-
quirement should be taken into consideration but that not only the heating stove itself radi-
ates but a poorly or none insulated boiler gives off heat in the room where it is installed.
Besides the frequently used cookers with built in heat exchangers and double shelled
cookers, which are also supplied in insulated versions, it is also possible to use the domes-
tic water unit with a through flow boiler.
As the pipes of a through flow boiler become calcified quickly where the water is hard, they
should only be used in areas where the water is very soft, that is very low in lime or only in
conjunction with a water softener.
Heating radiator pipes in pumped heating systems can use 1/2" pipe. It is recommended
that a circulation pump that can be regulated is incorporated where the delivery capacity
can be adjusted to the circumstances prevailing. The pump should be installed in the return
flow line. The direction of flow is important.
For exchange purposes if a repair is necessary, cut-off valves should be built in before and
after the pump.
Expansion vessels, boiler and pipes, which are installed in the loft must be well protected
against freezing.
If an installation is not used for some time in winter, it should be emptied. Radiators, venti-
lation valves or other cut off devices should be opened.

50
Before commissioning installation water must be fed through the filling and emptying cock
until water flows out of the overflow on the open expansion vessel. In the case of a closed
system, an over pressure of 1 to 1.5 bar must be created. In any case attention has to be
paid to slowly filling the system and the exhausting air through the integrated ventilation
valve before the above mentioned static pressure is reached or before the expansion ves-
sel overflows.
The closed system is recommended if possible for corrosion safety reasons. Corrosion
damage to domestic water boilers and stove boilers in open systems and to radiators be-
cause unhindered ingress of oxygen to the hot water cannot be excluded in the long term
domestic water may be taken from the heating circuit.
No domestic water may be taken from the heating circuit. Taking domestic water is only
permitted indirectly through intermediate heat exchangers (double shelled boilers or
through flow boilers).
The safety flow and return as well as the pipes to and from the domestic water boiler may
not be less than 1" diameter. Closed systems require a safety valve with an opening pres-
sure of 2.5 bar built into the flow line.
The manufacturer does not give a guarantee on corrosion damage to stove boilers, if non-
ferrous metals are used in the hot water circulation in open systems, in cases where no
suitable corrosion protection medium in accordance with the manufacturer's recommenda-
tions.
4.3 Integrating in an existing unit
The stove with integrated heat exchanger for the heat sink is suitable for incorporating in
existing units which are constructed as closed systems.
The safety valve on the central heating boiler in the cellar cannot cover the heating stove
as well. A separate safety valve should in any case be provided near the heating stove.
It is absolutely necessary to consume, respectively to store up the energy of the added
cooker. A buffer reservoir of 50 litres per kW water output is normally sufficient for buffer-
ing.

51
5. TECHNICAL DATA
5.1 Fuel
Low smoke, trouble-free operation of the stove and a supply of heat at the nominal level
with a chimney draught of 12 Pa are only guaranteed when you use the following fuels and
no others.
Only use natural, dry chopped firewood with a remaining humidity of max. 20% and lignite
(brown coal) briquettes.
Fuel type
Thermal content approx.
Comment
Lignite briquettes
Hardwood air dry
Softwood air dry
19,500 kJ/kg
14,600 kJ/kg
11,500 kJ/kg
Slow burning only possible
to a limited extent
No slack and no in chips or smoke intensive rubbish to be burnt.
Non-permitted fuels include:
Rubbish, fine chips, pellets, bark, parts of chipboards, coal slack, damp wood or wood
treated with preservative, paper, cardboard or similar. For lighting use wood shavings or
barbecue lighters. Never use liquid fire starters!
PLEASE NOTE:
The first time the stove is heated there may be some smoke and an unpleasant
smell. Make sure that the room is well ventilated (open windows and doors) and heat
for at least an hour at the maximum nominal heat load. If the maximum temperature
is not reached the first time the stove is heated, then there may be further unpleas-
ant smells at a later date.

52
5.2 Heating output data
The following table shows burning time, water output and heat emission (to the room
where it is installed) of your stove under normal conditions according to EN 12815 con-
cerning the charge quantities and control setting for the fuel materials coal and wood.
Output table according to EN 12815:2005
* brown coal Hu = 5.41 kWh/kg
wood Hu = 4.05 kWh/kg (residual moisture max. 20 %)
**with closed top lid
If coal is used which is not the common domestic grain then the amount of draw needed for
nominal heat load (NHL) increases and it is necessary to riddle more frequently.
The stove combustion chamber holds around 30% more fuel than shown in the capacity
table. Burning time increases accordingly.
Model 158 Fuel * Tempera- ture con-
trol setting
Secondary
air Quantity Total
output
kW
Water
output
kW
Heat
emission
to room
kW **
Nominal
thermal
capacity at
12 Pa
brown
coal
3 OPEN 10,6 kg / 2h
21 14 7
Wood
6,6 kg / 1h
22
14
8
Model 158F Fuel * Tempera- ture con-
trol setting
Secondary
air Quantity Total
output
kW
Water
output
kW
Heat
emission
to room
kW **
Nominal
thermal
capacity at
12 Pa
brown
coal
3 - 10,6 kg / 2h
22 14 8,2
Wood
6,6 kg / 1h
22
14
3,3

53
5.3 Dimensions, output values, flue gas values
All information provided by the exhaust gas values are based on the EN 12815 under stationary labo-
ratory conditions reserve the right to make changes which relate to technical advances and / or to an
improvement in quality. We accept no liability for printing errors and changes which occur after printing
Model
K158 / K158F
Registration
CE, 15a B-VG, VKF
External dimensions W x H x D (without lid)
See dimensional drawing 5.4
Height with top lids open
Height with top lids closed
Fire box W x D
234 x 421 mm
Fire box height min / max
270 / 400 mm
Hearth plate W x D
442 x 542 mm
Heating door opening W x H
173 x 195 mm
Forward and return connection
each 1" back
Flue gas connection
150 mm ø
Water content in heating pocket
16 l
Operating pressure max
2.5 bar
Waterside pressure loss in heat pocket at a flow of
0.85 m3/h:
1.7 m
3
/h:
3 mbar
13 mbar
Required delivery pressure at NHL
12 Pa
Flue gas temperature at flue gas connection at NHL
210 / 240 °C
Flue gas mass flow at NHL wood / brown coal
31,3 / 39,7 g/sec
Room heat capacity with coal for the room with favourable,
less favourable and unfavourable heating conditions ac-
cording to DIN 18893 / Tab. 2.
Continuous heating
Timed heating
210 / 120 / 82 m3
144 / 84 / 58 m
3
Operating temperature at regulator setting 1 / 2 / 3
45 / 60 / 80 °C
Weight gross / net
175 / 164 kg
CO (13% O2)
≤ 0,11 %
Dust (13% O2)
≤ 40 mg/m³
Efficiency
≥ 80%