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Thermorossi Free Line Wood Cookers
Installation, Use, and Maintenance Guide
Product Models
KLARETTA EVO
KLARISSA EVO
VIOLETTA EVO
MELISSA EVO
KLARA EVO
VIOLA EVO
MARGOT EVO
MARGHERITA EVO
Important Safety Information: Must read! Important information for safety and correct operation.
EU Declaration of Conformity (DoC)
Company: THERMOROSSI S.P.A.
Address: VIA GRUMOLO, N° 4, 36011 ARSIERO (VI), Italy
Contact: INFO@THERMOROSSI.IT, Phone: 0445/741310
This declaration concerns the following product:
Apparatus Model / Product: Stufa a legna (Wood stove)
Energy Efficiency Index: 117 (KLARETTA/VIOLETTA/KLARISSA/MELISSA EVO), 116 (KLARA/VIOLA/MARGOT/MARGHERITA EVO)
Useful Energy Efficiency at Nominal Heat Output: 87.4% (KLARETTA/VIOLETTA/KLARISSA/MELISSA EVO), 86.7% (KLARA/VIOLA/MARGOT/MARGHERITA EVO)
1. Introduction
1.1 Safety Guidelines
This installation, use, and maintenance manual is an integral part of the product. Read it carefully before installation, use, or maintenance. Comply with all local, national, and European regulations. The manufacturer recommends performing all described maintenance operations. Use the appliance only as intended; any other use is hazardous and the user is liable. Installation, maintenance, and repairs must be performed by qualified personnel. Use only original spare parts. Incorrect installation or maintenance can cause injury or damage. Unauthorized repairs void the warranty. Keep this manual accessible. If lost or damaged, contact the manufacturer for a replacement. Hand over the manual if the appliance is sold or transferred. Images are illustrative and may differ from the actual product. Thermorossi reserves the right to change manual content without notice. Copyright is retained by Thermorossi S.P.A.
1.2 Safety Standards
⚠️ PERSONAL INJURY: Important messages that can cause serious injury if not observed.
⚠️ DAMAGE TO PROPERTY: Fundamental instructions for appliance and system function. Adhere strictly to avoid serious damage.
ℹ️ INFORMATION: Important instructions for good functioning. Non-observance may lead to unsatisfactory performance.
1.3 Recommendations
Read the entire manual carefully. Failure to follow instructions can lead to damages for which the manufacturer is not responsible. User is responsible for modifications and maintenance. If excessive flue gas stagnation occurs, move away immediately and do not open the door until the flame has died down. Contact a service center. Do not turn on the appliance after such an event.
1.4 General Guidelines
Not for use by children under 8, persons with physical/mental impairments, or those unfamiliar with the manual. Children must not play with the appliance. Ensure the grate and ash pan are clean before lighting. ⚠️ DO NOT open the door while the flame is burning. Smoke exhaust pipes, door, handles, and other parts can reach high temperatures. Avoid prolonged exposure to hot air. Do not overheat the room. Keep flammable/combustible objects away. Do not place wet clothing on the appliance. First lighting may produce a slight smell from paint and protective oil; ventilate the room.
Attention: Do not wet the appliance. Never vacuum hot ash. Cleaning must be done when the appliance is cold.
Swiss Users: Refer to local cantonal regulations and the Note concerning installation of heaters.
1.5 Transportation and Storage
Transportation: Use trolleys. Protect glass and fragile parts from impact.
Storage: Store in a dry, sheltered environment. Avoid placing directly on the ground. Not advisable for long-term storage.
1.6 Guidelines for Correct Disposal
Dispose of the product at the end of its life according to applicable regulations and environmental respect, using designated collection centers. This promotes recycling and material recovery.
2. Technical Characteristics
The following tables detail the technical specifications for the Thermorossi Free Line Wood Cookers.
Models: KLARETTA EVO, VIOLETTA EVO, KLARISSA EVO, MELISSA EVO
Characteristic
KLARETTA EVO
VIOLETTA EVO
KLARISSA EVO
MELISSA EVO
Height (mm)
863
863
863
863
Depth (mm)
576
576
578
578
Width (mm) without handrail
770
770
770
770
Weight (Kg)
166
175
169
177
Smoke outlet diameter (mm)
130
130
130
130
Minimum draft (Pa)
12
12
12
12
Maximum permitted fuel feed (Kg) ***
1.7
1.7
1.7
1.7
Maximum hourly consumption (Kg/h) ***
2.2
2.2
2.2
2.2
Average load duration (Min) **
45
45
45
45
Firebox power (kW) **
9.4
9.4
9.4
9.4
Rated power (kW) **
8.2
8.2
8.2
8.2
Efficiency (%) **
87.4
87.4
87.4
87.4
CO emissions (mg/m³ at 13% O2) **
324
324
324
324
Heatable volume (m³) *
220
220
220
220
Average smoke temperature (°C) **
203
203
203
203
Smoke flow rate (g/s) **
5.5
5.5
5.5
5.5
Firebox feed opening dimensions (mm) (LxH)
214x273
214x273
214x273
214x273
Firebox dimensions (mm) (LxHxD)
235x364x382
235x364x382
235x364x382
235x364x382
Top oven dimensions (mm) (LxHxD)
253x307x336
253x307x336
253x100x336
253x100x336
Bottom oven dimensions (mm) (LxHxD)
-
-
253x252x336
253x252x336
* Note: Heatable volume is influenced by house insulation and appliance placement.
** Values obtained using beechwood logs (2 logs) with thermal value < 15,429 kJ/kg and moisture content < 15%. Using poorer quality fuel may result in lower yield, efficiency, and increased ash. The glass may also become dirtier.
*** Strictly prohibited to load more fuel than specified. Warranty does not cover damage from prolonged exposure to excessive temperatures.
Models: KLARA EVO, VIOLA EVO, MARGOT EVO, MARGHERITA EVO
Characteristic
KLARA EVO
VIOLA EVO
MARGOT EVO
MARGHERITA EVO
Height (mm)
863
863
863
863
Depth (mm)
676
678
676
678
Width (mm) without handrail
910
910
910
910
Weight (Kg)
203
215
210
222
Smoke outlet diameter (mm)
130
130
130
130
Minimum draft (Pa)
12
12
12
12
Maximum permitted fuel feed (Kg) ***
2.4
2.4
2.4
2.4
Maximum hourly consumption (Kg/h) ***
3.25
3.25
3.25
3.25
Average load duration (Min) **
45
45
45
45
Firebox power (kW) **
13.9
13.9
13.9
13.9
Rated power (kW) **
12.1
12.1
12.1
12.1
Efficiency (%) **
86.7
86.7
86.7
86.7
CO emissions (mg/m³ at 13% O2) **
387
387
387
387
Heatable volume (m³) *
330
330
330
330
Average smoke temperature (°C) **
224
224
224
224
Smoke flow rate (g/s) **
7.6
7.6
7.6
7.6
Firebox feed opening dimensions (mm) (LxH)
284x273
284x273
284x273
284x273
Firebox dimensions (mm) (LxHxD)
305x364x482
305x364x482
305x364x482
305x364x482
Top oven dimensions (mm) (LxHxD)
323x307x436
323x307x436
323x100x436
323x100x436
Bottom oven dimensions (mm) (LxHxD)
-
-
323x252x436
323x252x436
* Note: Heatable volume is influenced by house insulation and appliance placement.
** Values obtained using beechwood logs (2 logs) with thermal value < 15,429 kJ/kg and moisture content < 15%. Using poorer quality fuel may result in lower yield, efficiency, and increased ash. The glass may also become dirtier.
*** Strictly prohibited to load more fuel than specified. Warranty does not cover damage from prolonged exposure to excessive temperatures.
2.1 Dimensions
KLARETTA EVO – VIOLETTA EVO: Overall dimensions are approximately 863mm height, 770mm width, and 576mm depth. The smoke outlet is 130mm diameter.
KLARISSA EVO – MELISSA EVO: Overall dimensions are approximately 863mm height, 770mm width, and 578mm depth. The smoke outlet is 130mm diameter.
KLARA EVO – VIOLA EVO: Overall dimensions are approximately 863mm height, 910mm width, and 676mm (Klara) or 678mm (Viola) depth. The smoke outlet is 130mm diameter.
MARGOT EVO – MARGHERITA EVO: Overall dimensions are approximately 863mm height, 910mm width, and 676mm (Margot) or 678mm (Margherita) depth. The smoke outlet is 130mm diameter.
3. General Description
3.1 The Fuel
The appliance uses ordinary wood billets with 10-20% moisture content and a thermal value of 10,400-16,400 kJ/kg. Recommended woods are beech or common hornbeam. Using dry, well-seasoned wood is essential for correct operation and longevity. Avoid wet wood or wood seasoned for less than 18-20 months, as it can cause malfunctions and tarry deposits. Recommended log size is max 330 mm long (section Ø 80 mm), loading 2-3 logs.
Maximum Permitted Fuel Feed:
1.7 kg for KLARETTA EVO, VIOLETTA EVO, KLARISSA EVO, MELISSA EVO.
2.4 kg for KLARA EVO, VIOLA EVO, MARGOT EVO, MARGHERITA EVO.
Fuel Feed Interval: Must not be less than 1 hour.
⚠️ WARNING: Loading excessive fuel or frequent loading exposes components to very high temperatures. Warranty does not cover damage from prolonged exposure to these temperatures.
Using non-compliant fuel or substances voids the warranty. Do not use as an incinerator or with liquid/gas fuels. Do not overload. Do not store combustible material in the under-oven or tool storage compartments.
3.2 Main Components
For KLARETTA EVO, VIOLETTA EVO, KLARA EVO, VIOLA EVO:
A: Top smoke exhaust
B: Starter
C: Cooktop
D: Door firebox
E: Ash pan and riddling lever
F: Primary air control
G: Tool storage compartment
H: Secondary air levers
I: Oven
L: Under-oven compartment
M: Front handrail
N: Side handrail (optional)
P: Riddling tool
For KLARISSA EVO, MELISSA EVO, MARGOT EVO, MARGHERITA EVO:
A: Top smoke exhaust
B: Starter
C: Cooktop
D: Door firebox
E: Ash pan and riddling lever
F: Primary air control
G: Tool storage compartment
H: Secondary air levers
I: Oven
M: Front handrail
N: Side handrail (optional)
O: Device PANEPIZZA®
P: Riddling tool
F - Primary Air Control: Regulates primary air inflow through the firebox grate to control combustion power and speed. Rotate counterclockwise to reduce airflow, clockwise to increase.
⚠️ ATTENTION: Primary air control can be very hot during operation. Use the provided glove.
H - Secondary Air Lever: Regulates secondary air inflow, which preheats air and aids secondary combustion, keeping the glass clean. Shift levers left to reduce airflow, right to increase.
⚠️ ATTENTION: Secondary air levers are very hot during operation. Use the provided glove.
B - Starter: Creates a direct bypass for flue gases, aiding lighting and refuelling. Use the provided glove when activating, only for lighting or stoking. ⚠️ STRICTLY PROHIBITED TO LEAVE THE STARTER OPEN DURING NORMAL OPERATION. Leaving it open increases fuel consumption, reduces efficiency, and exposes the appliance to high temperatures, voiding warranty. The starter is very hot; use the glove.
Turning towards START activates the bypass; towards WORK activates normal flue gas path.
4. Installation
4.1 Appliance Location
Follow general guidelines (paragraph 1.1). Ensure flooring can withstand appliance weight; use countermeasures if necessary (e.g., load distribution plate).
⚠️ ATTENTION: Room must be well-ventilated and free from humidity/salty air. Install at safe distances from walls and furnishings. If flammable materials are nearby, comply with minimum distances (illustrated diagram: A=800mm, L=300mm, P=300mm). If flooring is combustible, install a fireproof protector plate. For heat-sensitive materials, use insulating/fireproof protection (ref. Uni 10683). Failure to comply voids warranty.
The installer must provide a certificate of conformity, including design plans and documents (materials report, project details, references to previous declarations, installer qualifications).
⚠️ IMPORTANT: Keep documents with the manual. Verify installation compliance. Do not install in unsuitable rooms (bedrooms, bathrooms, garages, lock-ups) or explosive atmospheres.
⚠️ CAUTION: This is not a simple household appliance. Improper installation or non-compliance can create dangerous conditions. User must verify room ventilation for oxygen supply. Do not install as inset or next to furniture.
4.2 Unpacking the Appliance
Appliance is shipped on a pallet. Use trolleys and keep it vertical. Remove cover and side panels. Remove feet fasteners. Use a trolley to remove from pallet, tipping it back onto wheels. Two people recommended due to weight. Protect glass and fragile parts. Remove protective film from cooktop.
IMPORTANT: Handle with care; damage during unpacking is not covered by warranty.
5. Assembling the Components
5.1 Mounting the Front Handrail
1. Fix supports (AO) to handrail (AN) using screws (AK).
2. Insert handrail with supports under the cooktop frame.
3. Tighten nuts (AP) onto screws (AQ).
4. Insert screws (AQ) with nuts into the handrail supports and tighten to secure.
5.2 Mounting the Side Rail (Optional)
Follow the same procedure as for the front handrail.
5.3 Mounting the Smoke Outlet Collar
The collar can be fixed to the back (rear outlet) or top (vertical outlet) of the appliance. Ensure no narrowing of pipes and airtight joints.
5.4 Casings
Appliance supplied with pre-mounted casings.
Majolica Casings: Surface imperfections, crazing, or shade variations are natural due to handcrafted nature. Clean with a dry microfibre cloth. Moist cloths can highlight crazing.
Metal and Cast Iron Casings: Clean with a dry or slightly moist microfibre cloth. Use non-abrasive cloths on a cold appliance.
6. Use of the Appliance
⚠️ CAUTION: Appliance surfaces, especially the combustion chamber door, are hot during operation. Do not touch. The product has CE marking. Not for use by children, persons with impairments, or those unfamiliar with the manual. Thermal expansions during heating/cooling may cause slight sounds; this is normal.
⚠️ ATTENTION: Keep the door shut tight. Smoke exhaust pipes get extremely hot. Do not touch. Do not use liquid or gaseous fuels for lighting. Keep flammable/combustible objects away. Do not place wet clothing on the appliance. First lighting may produce a smell; ventilate the room.
6.1 Lighting
Turn starter to START.
Rotate primary air control fully clockwise.
Move secondary air levers fully to the right.
⚠️ ATTENTION: Ensure grate is clean (no ash/residues) before lighting.
Open firebox door, place kindling, light with paper/tinder, then close door.
⚠️ PROHIBITED: Do not use alcohol, petrol, or other liquids/gases for lighting.
Do not leave unsupervised during lighting (approx. 30 mins) or with abundant embers.
Once lit, close starter towards WORK using the glove.
⚠️ ATTENTION: Open combustion chamber/ash pan doors ONLY for lighting, stoking, and removing material. Keep firebox door FIRMLY CLOSED and starter OFF during normal operation. Leaving starter open increases consumption, reduces efficiency, and causes overheating, voiding warranty. Starter is very hot; use glove.
ℹ️ NOTE: Cooktop may acquire a bluish/yellowish hue after first lighting; this is normal.
6.2 Refuelling
This is an intermittent combustion appliance requiring refuelling. Once embers are present:
Rotate starter to START.
Wait, then slowly open firebox door to minimize smoke. Use riddling tool to spread embers.
NB: Do not light/reload with embers higher than 3 cm.
Load two logs (within weight limits) parallel on the ember bed.
Slowly close firebox door, close starter towards WORK using glove.
Rotate primary air control almost fully, move secondary air levers fully to the left.
To rekindle, clear ash from air passage slots. Do not add fuel until previous load is embers. Open door slowly, place logs on embers, close door, return air controls.
6.3 Panepizza® Device
On KLARISSA EVO, MELISSA EVO, MARGOT EVO, MARGHERITA EVO models: Shift smoke deviator flap to the right to raise temperature in the top oven (for bread/pizza). Shift to the left to heat both ovens.
6.4 Thermometers
Product comes with one or two thermometers on the oven glass. These provide an approximate reading. Oven temperature depends on fuel quality, draught, and other factors and can vary suddenly. Always visually check food for doneness.
6.5 Prescriptions for Correct Operation
Respect maximum consumption; do not overload to avoid damage.
Maximum Permitted Fuel Feed: 1.7 kg (KLARETTA/VIOLETTA/KLARISSA/MELISSA EVO); 2.4 kg (KLARA/VIOLA/MARGOT/MARGHERITA EVO).
Fuel Feed Intervals: Must not be less than 1 hour.
⚠️ WARNING: Loading excessive fuel or frequent loading exposes components to very high temperatures. Warranty does not cover damage from prolonged exposure. Do not throw wood into the chamber; place it gently to avoid breaking parts. Damage caused this way is not covered by warranty.
Do not use as an incinerator or with liquid/gaseous fuels. Adhere strictly to operating instructions. Verify fuel lights correctly to avoid combustible gas buildup, which can exceed glass resistance. In adverse weather (low pressure, windy, rainy, high outside temps), draught may drop or reverse; increase primary air and use less fuel. If smoke smell or gas stagnation occurs, avoid using the appliance.
7. Cleaning and Maintenance
7.1 Foreword
Perform operations described below for correct operation and performance. Observe recommended frequency. If unused for a long period, inspect smoke channel/outlet for obstructions before startup. Failure to follow instructions can cause serious damage.
Attention: Do not wet or touch appliance with wet hands. Never vacuum hot ash. All cleaning must be done when the appliance is cold.
Periodically clean the appliance or have it cleaned by an authorized service center. Annual inspection of the flue outlet is advisable.
7.2 Cleaning and Maintenance
EVERY TIME YOU REFUEL: Agitate riddling lever to drop ash. Clean grate if necessary. Ensure air passage through grate is unobstructed. Use supplied riddling tool.
EVERY TWO DAYS or WHENEVER NECESSARY: Empty the ash pan regularly before it fills up completely.
EVERY WEEK: Use an ash vacuum device to clean the combustion chamber.
EVERY 6 MONTHS: Lift and remove cooktop to clean flue path with a flue brush and ash vacuum. To remove cooktop:
Remove Starter by pulling upwards.
Remove rings from cooktop with riddling tool.
Lift cooktop and vacuum flue path.
FOR KLARETTA EVO, VIOLETTA EVO, KLARA EVO, VIOLA EVO MODELS:
Vacuum the under-oven compartment.
Undo two screws, remove oven bottom, and clean thoroughly.
FOR KLARISSA EVO, MELISSA EVO, MARGOT EVO, MARGHERITA EVO MODELS:
Remove upper soapstone shelf and clean thoroughly.
Remove lower soapstone shelf and clean thoroughly.
AT LEAST ONCE A YEAR: Clean the flue outlet. Inspect horizontal sections and clean ash/soot deposits.
7.3 Cleaning the Cooktop and Glass Elements
Clean cooktop with mild detergents. Protect with a thin layer of oil or chrome paste. If rust appears, remove with a slightly abrasive scourer, then apply oil/paste. Clean glass and steel parts when cool, with water and mild detergents.
8. Smoke Exhaust Tube
8.1 Foreword
ℹ️ IMPORTANT: Due to accidents from poor flue outlet functioning, this section assists installers. Install exhaust pipes according to UNI 7129, UNI 10683, and fire prevention regulations. Failure to follow instructions can cause serious damage.
8.2 Room Ventilation
⚠️ ATTENTION: Extraction fans can interfere with operation. Do not obstruct vents or air inlets.
The room needs good airflow for combustion and ventilation, via permanent openings or ducts. Ventilation intake must be away from pollution sources.
Opening conditions:
Unobstructed section of at least 6cm² per kW thermal power (min 100cm²).
Openings must not be obstructed.
Protected by grills that don't reduce section.
Located near floor level; if not possible, enlarge section by 50%.
This chapter is not a replacement for UNI 7129/10683 standards. Qualified installers must be aware of these standards.
8.3 Smoke Outlet
⚠️ CAUTION: Smoke channels, pipes, chimneys, and outlets must comply with D.M. 37/08 and applicable regulations. Do not install where Type A/B gas appliances are present. Connection must serve only one heat generator. Provide access points for emissions checks, sealed airtight.
Insulation and optimal sizing of the flue outlet are recommended to prevent condensation.
8.3.1 Chimney Types
System: Compatible components from a single manufacturer, EC certified.
Composite: Compatible components from various manufacturers, installed on-site.
Relining: Installation of a specific pipe in an existing shaft.
8.3.2 Flue Outlet / Flue System Components
Every chimney requires a minimum number of components as per UNI EN 1443.
⚠️ ATTENTION: Wall outlets (direct to exterior without a roof chimney) are strictly prohibited.
Legend: COMIGNOLO E CANNA FUMARIA SECONDO NORMA UNI 10683 (Chimney and flue according to UNI 10683 standard). All pipes must be thermally insulated. Inspection: Height > 4m, Slope min 5%, Max 2m, Max 2-3m.
8.3.3 Controls Prior to Installing the Appliance
User must possess a certificate of conformance for the flue outlet (Ministerial Decree 22 January 2008, no. 37). Flue outlet must comply with UNI 10683.
The illustrated smoke exhaust is the best solution. For roof exhaust, use a union tee with inspection cap, suitable brackets, flashing, and chimney cap. For masonry exhaust, use a union tee with inspection cap and brackets. If flue outlet is too big, use a stainless steel/porcelain-coated steel tube. Seal connections with red silicone (350°C). Outer casing must be insulating material (mineral wool, ceramic fiber) or pre-insulated tubing.
THE FLUE OUTLET MUST BE USED ONLY FOR THE APPLIANCE.
Provide inspection openings for clean-out. ⚠️ ATTENTION: Insufficient insulation or excessive length can cause condensation; provide a drain. Appliance must be installed in a single flue outlet system dedicated exclusively to it. Connection to a non-compliant system can cause rapid deterioration and void warranty.
IF THE CHIMNEY CATCHES FIRE, CLOSE PRIMARY AND SECONDARY AIR LEVERS IMMEDIATELY AND CALL THE FIRE BRIGADE.
9. Problems, Causes and Solutions
Problem
Cause
Solution
Difficulty in lighting the cooker.
Blocked grate. Moist wood or too thick. Poor draught.
Clean the grate. Use smaller sized and more seasoned wood. Clean the ash pan. Remove cooktop and clean flue gas path/outlet. Check flue pipe (constrictions, curves, insulation, section).
Smoke in the room.
Poor draught.
Clean ash pan and drawers. Remove cooktop and clean smoke channel. Clean flue. Check flue pipe (constrictions, curves, insulation, section).
Difficulty maintaining the fire.
Poor draught.
Create adequate room ventilation. Use smaller sized and more seasoned wood.
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