HETAS FARROW 5.0kW User manual

Version Number: 2023 Issue no.3 Farrow User Guide
Date: 27/06/2023
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FARROW 5.0kW
Ecodesign Multi-fuel Stove
USER GUIDE
PLEASE RETAIN THIS GUIDE FOR FUTURE REFERENCE
Please read this user guide carefully when you assemble, install, operate and maintain your stove.
If you have any more questions, please contact your local dealer.
READ THE INSTRUCTION BOOKLET AND THESE SUPPLEMENTARY INSTRUCTIONS CAREFULLY BEFORE
INSTALLATION
These instructions together with those in the instruction booklet cover the basic principles to ensure
the satisfactory installation of the stove, although detail may need slight modification to suit
particular local site conditions.
In all cases the installation must comply with current Building Regulations, Local Authority Byelaws
and other specifications or regulations as they affect the installation of the stove.
It should be noted that the Building Regulations requirements may be met by adopting the relevant
recommendations given in British Standards BS 8303, BS EN 15287-1:2007 as an alternative means to
achieve an equivalent level of performance to that obtained following the guidance given in
Approved Document J.
Should any conflict apply between these instructions and the original manufacturer’s instructions
then the most stringent advice must apply.
Please note that it is a legal requirement under England and Wales Building Regulations that the
installation of the stove is either carried out under Local Authority Building Control approval or is
installed by a Competent Person registered with a government approved Competent Persons
Scheme. HETAS Ltd operate such a Scheme and a listing of their Registered Competent Persons can
be found on their website at www.hetas.co.uk.

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CO Alarms: -
Building regulations require that whenever a new or replacement fixed solid fuel or wood/biomass
appliance is installed in a dwelling a carbon monoxide alarm must be fitted in the same room as the
appliance. Further guidance on the installation of the carbon monoxide alarm is available in BS EN
50292:2002 and from the alarm manufacturer’s instructions. Provision of an alarm must not be
considered a substitute for either installing the appliance correctly or ensuring regular servicing and
maintenance of the appliance and chimney system.
1. INSTALLATION INSTRUCTIONS
APPLIANCE LOCATION
The appliance must be located at specific distances from its surroundings. This is to prevent damage to
products & furnishings within the vicinity of the appliance. Adequate space should be provided for
servicing the appliance.
We recommend furnishings be always kept 1m away, to avoid heat degradation over time. There must
be a minimum clearance of 75mm each side & back of the appliance, this is to non-combustible material
only, with 300mm clearance above and in front of the appliance, to provide sufficient space for heat to
dissipate to room space. See below for suggested distance to combustible materials.
VENTILATION
Your stove requires ventilation to supply it with air for combustion. Ventilation is also required to ensure
the proper operation of flues and chimneys to ensure that the products of combustion are safely
dispersed to
the outside air. Please ensure the stove has sufficient ventilation for operation.
Extraction fans lower the pressure in a building which can cause spillage of combustion products from an
open-flued appliance. This can occur even if the appliance and the fan are in different rooms. If
mechanical extraction is unavoidable in the same room as your stove, then seek specialist advice to
ensure safe operation of the appliance
Distance to
combustibles
Front
Side
Back
Hearth Temp
Farrow
100cm
50cm
60cm
>100°C

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COMPONENT SPARE PARTS
Please see below the list of spares available for your stove. Only the approved manufactures spare parts must be
used. Any attempt to fabricate a replacement or to modify any parts of the stove will invalidate the warranty and
may render the stove dangerous. This could also have a detrimental effect on the environment.

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1.1. Safety Advice
1.1.1. Handling
Necessary facilities must be available for loading, unloading and site handling.
1.1.2. Metal Parts
Be careful of personal injury when installing of maintaining this appliance.
1.1.3. Other possible injuries
The stove contains no harmful materials, but if there is a possibility of using any dangerous materials
in the course of installation then please seek specialist guidance and use appropriate protective
equipment.
1.1.4. Important Warning
This appliance MUST NOT be installed into a chimney that is shared with any other heating
appliance. There MUST NOT be an extractor fan fitted in the same room as the stove as this can
cause the stove to emit fumes into the room.
1.1.5. Warranty
We provide a five-year warranty for the stove body. The internal accessories of the stove body are
vulnerable parts and the warranty is six months. Fragile glass is not covered by the warranty.
1.1.6. Asbestos
This stove contains no asbestos. If there is a possibility of disturbing any asbestos in the course of
installation, then please seek specialist guidance and use appropriate protective equipment.
1.1.7. Use of fireguard
When using the stove in situations where children, aged and/or infirm persons are present a
fireguard must be used to prevent accidental contact with the stove. The fireguard should be
manufactured in accordance with BS 8423:2010.
1.1.8. Aerosol sprays
Do not use an aerosol spray on or near the stove when it is alight.

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1.1.8. Periods of Prolonged Non-Use
If the stove is to be left unused for a prolonged period of time, then it should be given a thorough
clean to remove ash and unburned fuel residues. To enable a good flow of air through the appliance
to reduce condensation and subsequent damage, leave the air controls fully open.
2. Installation
2.1. Chimney
The chimney must be fitted in accordance with manufacturer’s instructions and the relevant part of the
Building Regulations. The chimney height and the position of the chimney terminal should conform to
Building Regulations and all local regulations, including those referring to national and European
standards. The chimney must be in good condition, any cracks and obstructions are not permitted. The
diameter of the flue should not be less than 125mm and not more than 200mm. If any of these
requirements are not met, the chimney should be lined by a suitable method.
The chimney must be swept and examined for soundness and suitability before the appliance is
installed. Remedial action should be taken if required, seeking expert advice if necessary. Where the
chimney is believed to have previously served an open fire installation it is recommended that the
chimney be swept a second time within a month of regular use after installation.
If you have any doubts about the suitability of your chimney, consult a local installer.
2.2. Flue Draught (Working range 12-25 Pascals)
On commissioning the Stove, a flue draught reading must be taken and documented on the
commissioning certificate this reading ensures the stove is operating within its designed parameters
and its optimum efficiency. Adding the flue draught reading to the commissioning report, this report
will be completed by the installer. A sample point has been included on this appliance and is located
on the top right-hand side of the stove. Care should be taken when proceeding with the test as all
stove parts will now be hot.
Remove the screw from the test point and insert the hose or test probe of the manometer or
draught gauge. Record the reading in pascals (Pa). The optimum reading should be in the range of
12-15Pa. A flue draught may exceed 15Pa but must not exceed 24Pa. Anything above 24Pa may
result in the over-firing of the stove. As a direct consequence of this the fuel consumption will be
excessive which may result in a chimney fire. Remove the hose or test probe and replace the screw
confirming the test point is sealed. If the flue draught is outside the specified range for the
appliance, remedial action is necessary to correct the problem and allow the chimney to operate at
the correct draught. This might typically include adding a draught stabilizer to reduce too high a
draught or lining and insulating an overly large chimney if the draught is too low.
The chimney must be swept before fitting a liner to the stove and it is a condition of the
warranty that it must be swept every twelve months thereafter, but not limited to depending on
use. If used regularly, it is recommended that your chimney is swept every six months.
2.2.2. WARNING NOTE
Properly installed, operated and maintained this stove will not emit fumes into the dwelling.

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Occasional fumes from de ashing and re fuelling may occur. However, persistent fume emission
is potentially dangerous and must not be tolerated. If fume emission does persist, then the
following immediate action should be taken:
(a) Open doors and windows to ventilate the room and then leave the premises.
(b) Let the fire go out.
(c) Check for flue or chimney blockage and clean if required
(d) Do not attempt to relight the fire until the cause of the fume emission has been identified
and corrected. If necessary, seek expert advice.
The most common cause of fume emission is flueway or chimney blockage. For your own safety
these must be kept clean at all times.
2.3. Chimney Connection
You should brick up or seal an existing fireplace opening with a register plate. A short length of flue
pipe of a minimum 125mm internal diameter may then be used to connect the stove to the chimney.
This flue pipe should conform to Building Regulations. Ensure that the pipe end is no closer than
76mm to the side or rear chimney walls.
Ideally, the old fireplace should be filled in so that there is a smooth streamlined entry into the flue
way. The length of any horizontal run of flue pipe must not exceed 125mm.
It is essential that all connections between the stove and chimney-flue are sealed and made
airtight. This appliance is not suitable for installation in a shared flue system.
Both the chimney and flue pipe must be accessible for cleaning and if any parts of the chimney

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cannot be reached through the stove (with baffle removed), a soot door must be fitted in a suitable
position to enable this to be done.
2.4. Air Supply
A permanent, unobstructed air opening is essential for the room or space containing this appliance.
The air opening should be at least 3625mm2 when a draught stabilizer is equipped. Due care for air
requirements will need to be taken if any other appliances are permitted to work in the same room
and space.
2.5. Air Inlet
Your stove requires air to function, this enters at the bottom rear of the appliance.
A direct supply air kit is included as standard as a connection point for direct supply/duct installation
requirements.
2.6. Material Clearances
It is workable for the appliance to be recessed in a prepared fireplace, but a suitable free air gap must
be left around the sides, top and back of the appliance to reach maximum heat output and for access
to the rear of the stove.
In all instances the back wall of the fireplace recess and the hearth should be made of non-
combustible material.
The hearth should be placed on a constructional hearth at least 125mm thick in accordance
with the current building regulations.
Care should be taken to level the stove using the adjusting screws in the feet.
The appliance shall be installed on a floor with adequate load-bearing capacity. If the existing
construction does not meet this prerequisite, suitable measures (e.g. load disturbing plate) should be
taken to achieve it.
2.7. Commissioning and Handover
You should leave an appropriate period of time for fire cement and mortar to dry out upon
completion of the installation. In order to ensure the smoke and fumes are taken from the stove up
the chimney and emitted safely to atmosphere, a small fire should be lit first. Do not run the stove
at full output for at least 24 hours.
Finishing the installation and commissioning, the operating instructions and tools for your stoves
should be kept in hand. It is also important to know how to use the stove properly and use only the
recommend fuels for this appliance. The user should know how to have smoke or fumes emitted
properly form the stove and be warned to prevent injuries in case of the presence of children, aged
or infirm persons.
3. Operating Instructions
Operation with the door open can cause excess smoke. The appliance must not be operated with the
appliance door left open except as directed in this user guide.

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Operation with the air controls or appliance dampers open can cause excess smoke. The appliance
must not be operated with air controls, appliance dampers or door left open except as directed in this
user guide.
3.1. Important Information
All local regulations, including those referring to national and European Standards need to be
complied with when installing the appliance.
This appliance is not suitable for installation in a shared flue system.
The firebox and ash pit cover shall be kept closed except during ignition, refuelling and removal of
residue material to prevent fume spillage. It is important to use this appliance correctly to achieve
best results.
3.1.1 The Clean Air Act 1993 and Smoke Control Areas
The Clean Air Act 1993 and Smoke Control Areas Under the Clean Air Act local authorities may
declare the whole or part of the district of the authority to be a smoke control area. It is an offence to
emit smoke from a chimney of a building, from a furnace or from any fixed boiler if located in a
designated smoke control area It is also an offence to acquire an unauthorized fuel" for use within a
smoke control area unless it is used in an "exempt" appliance (“exempted “from the controls which
generally apply in the smoke control area).
In England appliances are exempted by publication on a list by the Secretary of State in accordance
with changes made to sections 20 and 21 of the Clean Air Act 1993 by section 15 of the Deregulation
Act 2015 Similarly in Scotland appliances are exempted by publication on a list by Scottish
Ministers under section 50 of the Regulatory Reform (Scotland) Act 2014.In Wales and Northern
Ireland these are authorized by regulations made by Welsh Ministers and by the Department of the
Environment respectively. Further information on the requirements of the Clean Air Act can be found
here at: https://wwwgovuk/smoke-control-area-rules Your local authority is responsible for
implementing the Clean Air Act 1993 including designation and supervision of smoke control areas
and you can contact them for details of Clean Air Act requirements.
The Farrow 5.0kW Multi-fuel stove have been recommended as suitable for use in smoke control
areas when burning wood logs. The Farrow 5.0kW Multi-fuel stove must be fitted with a permanent
stop to prevent closure of the combustion air controller beyond 6mm open.
3.2. Air Controls
Warning! Parts of the appliance, especially the external surfaces will be hot when in operation and
due care need to be taken e.g. Protective gloves should be given in operation.
It is essential for the appliance to have sufficient air supply for combustion and ventilation.
If the stove is to be installed in a designated Smoke Control Area (further information can be found
via https://www.gov.uk/smoke-control-area-rules) then the secondary air lever must be fitted with a
restrictor plate to prevent total closure of the secondary air control.
The restrictor is the bottom secondary intake as shown.

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Restrictor Open Restrictor Closed
3.2.1. Primary Air
Primary air is controlled through the assembly on the bottom of the door. This provides a conventional
air draught which passes through the fuel bed. The primary air intakes can be adjusted to control the
fire in combustion chamber.
3.2.2. Secondary Air
The appliance is fitted with an air wash system which can keep the heat-resistant glass of the
fire door clean. This secondary air is controlled through the fittings on the bottom of the
stove.
3.2.3. Tertiary Air
The tertiary air supply is bled into the stove from the rear panel. Its function is to ignite
unburned gasses helping provide a clean burn. This tertiary air supply is permanently open
and allows a small amount of air into the stove.
6mm

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3.3. Grate
There are Two options: Rotary style and grid style. For rotary style grate, you can operate it by
dragging a stainless-steel rod forward and backward to de-ash. For grid style grate, a special hook
is supplied to de-ash. It is highly recommended to de-ash regularly in case any build-up of ash will
damage the cast iron fuel bed. You should be careful of any hot parts.
Ash Pan
It is essential that you clean up the ash pan regularly. Use the supplied tool to lift the ash pan out of the
stove.
3.4. Burning Wood
The refuelling intervals at nominal heat output will be approximately 1.5 hours. You may load wood

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higher in the stove than solid mineral fuel, but wood or logs are not permitted to touch the baffle
plate.
Wood burns most efficiently with the primary air controls closed and the secondary control partially
open. Moving the secondary control will control the burn rate of the stove.
Wood burns best with a layer of ash on the fuel bed, and care should be taken to only remove
surplus residue from the stove timely.
We recommend you only use dry, seasoned wood as fuels; the wood should have been cut, split and
stacked for at least one year in a circulating air surround to dry out. Otherwise, wet or unseasoned
wood will cause tar deposits in the stove and unsatisfactory heat output will occur.
We recommend the use of wood logs with a moisture content of less than 20%.
Burning wet or unseasoned wood will create excess smoke emissions, tar deposits in the stove and
chimney and will not produce a satisfactory heat output. Wood fuel purchased from an approved
source may still require some drying out to remove surface water before use.
3.5. Refuelling on to a low fire bed
If there is insufficient burning material in the fire bed to light a new fuel charge, excessive smoke
emission can occur. Refuelling must be carried out onto a sufficient quantity of glowing embers and ash
that the new fuel charge will ignite in a reasonable period. If there are too few embers in the fire bed,
add suitable kindling to prevent excessive smoke.
3.6. Fuel overloading
The maximum amount of fuel specified in this user guide should not be exceeded, overloading can
cause excess smoke. We suggest that you refuel every 45 minutes to 1 hour, dependent on fuel.
The recommended maximum dimensions of wood logs are as specified below:
Model
Max fuel load
Max log length
Farrow
1.02kg
280mm
4. Lighting the stove
1. Open the door and ensure the secondary/ air-wash control lever is opened fully. It’s the control on the
right.
2. On first lighting, we recommend using 2 - 3 firelighters along with wood kindling built in a pyramid
above the firelighters to obtain a good fire bed. Ignite the firelighters then close the stove door and allow
the firelighters and wood kindling to ignite to the point where the embers are glowing.
3. Add your fuel of choice and control the stove as advised. Burn small loads initially in your new
appliance before full fires are used, to allow paint & fitting cement to cure.
Controlling Stove
4.1.1 Burning wood

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• Air-wash/secondary air lever (The control to the right) - Use this to control the fire when burning wood.
• Primary air control lever (The control to the left) – This should be closed as wood does not need air
from below to burn effectively.
• Avoid overloading your appliance as this may cause damage to the product and cause unstable burn
conditions. See max fuel load stated in ‘Refuelling Wood’ section for more info.
4.1.2 Burning smokeless fuel
The Air-wash/secondary air lever (The control to the right) –This should be left partially open, to allow the air-
wash system to keep the glass clean.
Primary air control lever (The control to the left) - When burning coal, the stove should be mainly controlled
using this lever.
Avoid prolonged periods of slow burning which may cause build-up of creosote with certain fuels. Using a flue
temperature gauge can help achieve the optimum temperature for clean combustion. See bottom of page 17
for optimum flue temperature for the relevant fuels.
4.1. Recommended Fuels
• Split and dried logs properly seasoned with less than 20% moisture content (max fuel load on page 10
should not be exceeded).
• Eco Logs.
5. Maintenance
5.1. Stove body
Use a soft brush to clean the stove; cleaning must ALWAYS be done after it has cooled down. The
finish can be renewed with proprietary stove paint.
5.2. Baffle plate
Remove and clean the baffle plate once a month to avoid soot or fly ash.
Block the flue ways and produce dangerous fume emission.
5.3. Fireproof glass
Use a proprietary glass cleaner to clean the glass when cool. Any material that may damage the glass
should not be used to clean the panel. Wet logs on heated glass, a badly aimed poker or heavy
slamming of the doors could crack the glass panels and care should be taken.
5.4. Ceramic rope
Ceramic or fiberglass rope is used on the stoves. Inspect the rope around the door and glass. If rope
is becoming detached, use a proprietary rope glue to reattach it. Ensure you replace the rope in the
case of it being in poor condition.
5.5. Flue & Chimney
Keep the chimney, flue way and any connection flue pipe swept regularly.
For users of smokeless fuels, sweep at least once a year; for wood and other fuels, at least twice a
year. If the stove is fitted in place of an open fire, then the chimney should be swept one month after

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installation to clear any soot falls which may have occurred due to the difference in combustion
between the stove and an open fire.
6.Troubleshooting
Problem
Probable Cause
Recommended Action
Fire difficult to light
Green/Wet wood
Use recommended fuels
Insufficient air
Open air controls
Insufficient draft
Check flue is not obstructed,
sweep if needed
Fuel too large
Use kindling/small logs to start
fire
Fire bums too quickly
Too much air
Reduce air controls
Excessive draft
Install draft stabilizer/damper
Insufficient Seal
Check condition of rope seal
around glass
Smokes upon initial lighting
Cold flue pipe
Burn firelighters/small fuel loads
to preheat flue prior to using
larger fuel
Smokes while burning
Insufficient draft
Check flue is not obstructed
Glass blackening
Insufficient Air
Open air-wash control
Damp fuel
Use recommended fuels
Insufficient seal
Check condition of rope seal
around glass
Glass crazing (minute
splinter marks on glass)
Cold liquid hitting warm
glass
Replace glass
Low heat output
Poor quality fuel
Use recommended fuels
Insufficient Seal
Check condition of rope seal
around glass

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7.Technical information
8.Dimension
Appliance
Height(mm)
Width(mm)
Depth(mm)
Weight(kg)
Collar(mm)
Maximum log
length(mm)
Farrow
531
380
377
64
5”/130
250x100
Appliance
Farrow
Fuel type
Beech
Smokeless Fuel
Output kW
(nominal)
5.0
4.9
Efficiency (%)
75.6
86.5
Seasonal Efficiency (%)
65.6
76.5
CO Emissions
at 13% O2(vol%)
0.12
0.10
NOx Emissions
at 13% O2
(mg/m3)
102
111.0
CxHy (OGC)
Emissions at
13% O2
(mg/m3)
118
45
Dust (PM)
Emissions at
13% O2
(mg/m3)
28
16
Flue gas temp.
(oC)
282
210

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9. Farrow Technical drawing

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Disposal After Product Life Expired
To dispose of the stove after the product life has expired, please observe the following information:
•Dispose of the items correctly i.e., separate the parts to be disposed of in material groups.
•Always dispose of items in a way that is as sustainable as possible and that is in line with the current
environmental protection, reprocessing/recycling and disposal technology.