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FAQ – Open Wood Fireplaces

The Heatmaster Open Wood Fireplaces are intended to add ambience, atmosphere and character to a home while providing warmth as a secondary heat source. Our range of gas and wood fireplaces is proudly Australian made.

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The Heatmaster open wood fires are intended to add ambience, atmosphere and character to a home while providing warmth as a secondary heat source. While the unique 5 sided heat exchanger makes the Heatmaster a very efficient open fireplace, the open wood fires are not intended to operate as a slow combustion heater or be used as a sole source of heating.
It is not uncommon for the firebox or fascia to be scratched during the installation, this is nothing to be alarmed about. A spray can of high temp (Stove Bright) paint can be used to touch up any blemishes or scratches once the installation is complete.
Every 1 to 2 years you should engage a chimney sweep to ensure that the flue is clear and clean and the unit is running to it’s optimum.

Respraying of the unit is recommend at this time using Stove bright satin black spray can.
The Heatmaster firebox system is a highly efficient open fireplace however it is not designed to be used as a primary source of heat.

Heating capacity
Heatmaster 650 6-8 Squares
Heatmaster 750 8-10 Squares
Heatmaster 900 10-12 Squares
The Heatmaster “B” series (into brickwork) uses an inner stainless steel flue and the “A” series use a twin skin flue system, which comprises of an inner stainless flue and an outer galvanized flue.

Firebox Stainless Steel
Inner Flue
Outer Flue
A450 150mm 200mm
A650 180mm 230mm
A750 200mm 250mm
A900 200mm 250mm

Firebox Stainless Steel
Inner Flue
B450 150mm
B650 180mm
B750 200mm
B900 200mm
A range of the Heatmaster fireboxes are made in Australia and China.
Australian hard wood is best such as Red gum, Yellow box and Jarrah. Softwood especially pine should only be used as kindling. Green or wet wood of any type should not be used. Never use accelerants of any kind to start your fire.
Heatmaster fireboxes are made from BHP Pressed steel, ranging from 2mm thick for the outer casing to 6mm for the internal back and sides.
Heatmaster have an optional firescreen / spark arrester available for each size firebox. Alternatively you may choose to use a freestanding generic screen. Heatmaster recommend that you always use some form of firescreen and never leave your fire unattended.
The warranty varies from 12 months for grate and ashtray to 10 years on the firebox (under normal/intended use, 3 years labour)
The Heatmaster “A” series fireboxes are unlike any other firebox, they have all been designed with a layer of insulation allowing installation into timber and plaster with minimal clearances.
  • Heatmaster have the only firebox to be fully insulated
  • The Heatmaster firebox does not require a gather
  • Heatmaster open wood fires has a five sided heat exchanger
  • Heatmaster units have a removable easy clean grate and ashtray
  • Heatmaster wood fires use a 6mm internal firebox
  • Yes, all open wood fires have a damper which can be closed when the unit is not in operation.
    The damper is to be fully open while the firebox is in operation. The only time you should close the damper is to stop insects from entering the firebox, or to stop any other form of heating from escaping the room.
    No. Some councils will not allow construction of a new brick chimney open fire, however as an efficient heat circulating firebox the Heatmaster is accepted. *individual council regulations may vary
    The Heatmaster unit is uniquely designed with tapered sides to help generate a superior heat output. The tapered sides help in two ways to provide more heat output; one is reflecting more radiant heat back into the room and the other is to create a larger air chamber to produce more convective heat.



    Base of ashtray to top of opening
    Depth Back
    450 450mm 380mm 285mm 335mm
    650 650mm 410mm 330mm 420mm
    750 750mm 410mm 380mm 470mm
    900 900mm 410mm 420mm 570mm

    *Measurements are approximate and are to be used as a guide only.
    Model: 450
    Width Front: 365mm - Across 10 prongs
    Width Back: 290mm - Across 10 prongs
    Depth (Middle Bar): 270mm
    No. of prongs: 10
    Weight: 5.5 Kg

    Model: 650
    Width Front: 550mm - Across 10 prongs
    Width Back: 325mm - Across 6 prongs
    Depth (Middle Bar): 320mm
    No. of prongs: 10
    Weight: 14.5 Kg

    Model: 750
    Width Front: 575mm - Across 10 prongs
    Width Back: 460mm - Across 8 prongs
    Depth (Middle Bar): 365mm
    No. of prongs: 10
    Weight: 17 Kg

    Model: 900
    Width Front: 685mm - Across 12 prongs
    Width Back: 570mm - Across 10 prongs
    Depth (Middle Bar): 410mm
    No. of prongs: 12
    Weight: 22.5 Kg

    *Weights and measurements are approximate and are to be used as a guide only.

    650 Log Grate and ashtray below (dimensions are approx. and may vary).

    750 Log Grate and ashtray below

    900 Log Grate and Ashtray below


    Model Weight
    with grate and tray
    55 Kg B450
    with grate and tray
    30 Kg
    with grate and tray
    99 Kg B650
    with grate and tray
    77 Kg
    with grate and tray
    116 Kg B750
    with grate and tray
    93 Kg
    with grate and tray
    150 Kg B900
    with grate and tray
    119.5 Kg
    with grate and tray
    230 Kg    

    *Weights are approximate and are to be used as a guide only.
    The clearances are 100mm above the unit and 25mm from back and sides.
    The clearances are 25mm from any combustible material from the outer flue.
    The flue must protrude no less then 600mm with nothing obstructing within 3600mm.
    Yes. The fireboxes have been tested to sit on a hearth which is constructed from a 25mm ventilated air gap with two sheets of AC sheeting and one sheet of 1mm steel.
    The hearth must protrude 350mm out in front and 200 mm on both sides of the firebox opening.
    The main reason for the cowl is to stop rain from coming down the flue. There are many different cowls that can be used, the most common and the most economical cowl used by Heatmaster is the CH cowl. In high wind situations we would recommend an anti down draft cowl.
    While the Heatmaster open fire is designed for indoor use, many people choose to install their fire in an outdoor or alfresco area. Please note that the Heatmaster firebox is manufactured with mild steel and if subjected to weather, surface rust will occur.
    Simply rub down your Heatmaster open wood fire with “Wet And Dry” sandpaper and re-paint using Stove Bright Flat black paint
    The “A Series” firebox has clearances from combustible material and also exposed pop rivets around the face. The standard Heatmaster 3 sided, or 4 sided fascia will cover both the pop rivets and the required clearances however you can also choose to use other non-combustible material rather than the Heatmaster fascia.
    Depending on the type of install.

    The ”B Series” is designed to be installed into brickwork. If it is a new installation, generally the brickwork will wrap around the face of the firebox covering the front flange, so in this case, You do not require a fascia.

    If the firebox is being installed into an existing chimney, the front flange may overlap the front of the brickwork, in this scenario you may choose to finish the installation with a fascia (as the thickness of the front flange differs from top to bottom).

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