Help Centre

Click on the heading of the article in red to open the full article. 

  1. What is a load limiter? 19/10/2017

    Along the top of the fire chamber is a load limiter, which is designed to restrict the operator from overloading it. This will burn off in approximately 3-7 years depending on frequency of use. The load limiter does not need replacing but the airtubes will. 

     

    Load Limiter airtubes

  2. What are the ceramic chips/divots in my cylinder? Is it normal? 19/10/2017

    These are exposed air blisters and are completely normal. The blisters are a result of small air pockets getting trapped just at the edge of the surface in our castings. Depending on how much air is trapped inside these, they sometimes erupt and take a piece of the ceramic off. These will not affect the performance of the fire at all.

    There is over 35mm of thickness to the cylinder, and this is then wrapped in a thick insulating blanket and a complete steel band to ensure that nothing can escape from the cylinder walls. 

     

    Example:

    Pyroclassic divots

     

     

  3. Air Supply 19/10/2017

    The room or space containing the Pyroclassic needs no additional ventilation unless a draught stabilizer is fitted, in which case a permanent opening of at least 1500mm2 should be provided. Any air opening must be kept clear from blockage and obstruction. Due consideration should be given to air requirements for any other appliances in the same room or home, such as heat transfer kits, kitchen range hoods, laundry dryers, bathroom vents etc.

  4. What is the warranty for Pyroclassic parts? 19/10/2017

    The ceramic firebox in the Pyroclassic IV is warranted for 15 years against defective material or workmanship, providing that the fire is used according to the manufacturer's operating instructions. Cracks and blisters to the cylinder are not considered a failure of the ceramic firebox.

     

    All other parts are warranted for 12 months from the date of purchase. This warranty does not cover damage or failure caused by tampering, carelessness, abuse or misuse, cosmetic damage or general wear and tear - this includes damaged door knobs and broken door glass. All cases will be considered at the manufacturers discretion.

     

    Please note: the warranty only applies to the original owner registered on the warranty card and cannot be transferred without express permission by the manufacturer.

  5. How much does it cost? 18/10/2017

    To download the RRP price list of our Pyroclassic wood fire and accessories, click HERE. 

  6. More information about the 2 hectare rule under the NES 18/10/2017

    Most urban areas in New Zealand experience air pollution during winter. Our focus is on improving air quality in those areas. Urban areas typically have smaller property sizes and as there is no nationally consistent definition for an urban environment, a property size of less than 2 hectares was used. The standard two hectare rule applies throughout New Zealand including rural areas.

     

    See more information at http://www.mfe.govt.nz/air/national-environmental-standards-air-quality

  7. What wood should I be using? 18/10/2017

    Short answer

    DRY. This means a maximum of 25% moisture content but ideally under 18% if possible.

    Do not burn any wood which has been treated as this will release poisonous gases and dioxins. Do not use any driftwood as the salt content can cause irreparable damage to the ceramic cylinder and metal components. Younger softwoods and timber which has a higher moisture content will produce a greater volume of creosote and soot than dry, well seasoned hardwood. 

    Logs should be approximately 100mm - 120mm in diameter by around 300mm - 400mm long.

     

    Long answer

    Dry wood is a must. To get the heat out of wood the fuel must pass through several stages. Firstly, free water that is not chemically bound with the wood is driven off – even wood at 20% moisture content still has to get rid of 2 litres of water for every 10 kilograms of wood. In the second stage the wood breaks down into the volatile gases, liquids and charcoal. Finally, the charcoal is also gasified, burning with a very short flame close to the char surface that appears to glow. In wood stoves all stages proceed simultaneously.

    Wood is the most prolific worldwide, solar embedded, carbon sequestered energy source which is renewable in a human lifetime. It will provide energy when the sun is not shining and the wind is not blowing, when the outside temperature is above or way below freezing and when the electricity is not coming out of that little hole in the wall. If the abundant, worldwide timber resource is managed correctly it is the most sustainable, environmentally safe, renewable, resource we have and it has sustained mankind for centuries, providing us with warmth for the space we live in, warm water to clean with and the ability to cook food.

    With the discovery of more energy intensive and easily transportable fossil fuels, wood was relegated to a lowly place in the order of preference and although it is bulky to transport it is the safest as it does not need a specially built pipeline, it won't suddenly explode or cause devastating marine pollution and with almost no refining can be used in its raw state. The closer it is used to the place where it has grown makes this an even more environmentally friendly product.

    Most designer wood burners catering to aesthetic demands totally disregard the thermal conductivity of wood. Microscopic examination of wood shows the channels which carry the liquid nutrients up and down the tree; consequently the properties of wood are very different along the grain than across it. Heat moves along the grain about fifteen times faster than across it, therefore, solid wood across the grain does not conduct heat and is an effective insulator meaning it does not readily burn.

    When a fire is lit, even by rubbing two sticks together, the gasification process starts and it is the combustion of these gases with air that produce heat which we see as flames and smoke. When heat cannot penetrate wood easily, i.e. across the grain, the volatiles given off are not rich enough nor hot enough to burn efficiently. Efficiency apparently is not a consideration in such panoramic appliances.

    This is getting to the really nerdy bit now...

    Burning of the volatile gases delivers over 60% of the heat stored in the original log but few heaters can recover the major portion of this heat as the volatiles must be over 600°C and mixed with hot oxygen to burn them. Now these are difficult conditions to meet and here’s why: if the main air supply comes from under or around the burning logs, the glowing char consumes all of the oxygen - it takes only 5cms of glowing char to consume all the available oxygen. At that point, incomplete combustion continues as characterised by increased carbon monoxide and tars which mostly go up the chimney where the unburnt volatiles deposit on the flue walls as a highly flammable, gummy substance known as creosote. It is wrong to introduce cold secondary air above the fuel as it cools the gases below their ignition temperature and now they won’t burn at all. The requirement is to introduce a highly pre-heated but variable volume of air for the different stages of combustion. This is done very efficiently by the secondary air tubes inside the Pyroclassic IV fire.

    All fires consume large volumes of air in order to extract the oxygen required to burn their fuel. One kilogram of wood needs 3.7m3 of air to burn completely, although this is only a theoretical minimum for stoichiometric combustion. Such ideal combustion does not exist in real life as only some of the oxygen in that amount of air can be used and therefore 'cool fires' need some 200% - 300% excess air to get the oxygen they need. Therefore some 7 - 10m3 of air per kilogram of wood pass through the firebox cooling the core temperature inside it and cooling air below 600°C , which kills the reaction needed to burn the volatiles. In most fires the air needs of the fire make it work against itself making it inefficient and polluting, the excess air it uses only goes up the chimney with all that gas, tar and particulates. A Pyroclassic IV only uses super-heated air in its secondary burn cycle ensuring there is no cooling of the firebox and no excess air consumed.

    Burning wood scientifically is done very effectively by the Pyroclassic IV freestanding woodburning fire but even the cleanest and most efficient woodburning stove needs logs which are as dry as possible to give the best output from your fuel. Check the moisture content of your wood when you buy it and then let nature do the hard work for you. Stack it off the ground in an open sided, roofed store to allow plenty of air flow around it for as long as possible or at least until the moisture content is below 20%. It’s then ready to be used in your Pyroclassic fire to give you a nice warm house right through winter in the most efficient and cleanest way possible.

  8. What if I have a two storey house and require extra flue lengths? 18/10/2017

    A longer flue is fine however this will cause the fire to run at a slightly higher burn rate and consume more fuel than usual due to the extra draw that this length puts on the fire, otherwise there is no issue with this.

    Download our second storey penetration kit installation instructions HERE.

  9. Door knob troubleshooting 18/10/2017

    The expected lifespan of a door knob is somewhere between 4 - 10 years depending on how the fire is being operated. 

    The door handle will get hot during operation and this is completely normal. 

    There are two typical known causes of premature failure of the door knob. The first is excessive charring on the back of the knob due to high levels of concentrated heat from burning close behind the door area. The second cause can be due to the door being over-tightened when it is closed which in turn leads to it being very tight to open once the fire has heated up. The continued cycle of this over-tightening causes the screws to become weakened from the higher levels of load put on them in each direction each time, which eventually results in it coming loose and breaking away from their fixings.

    A combination of these two is actually the most common cause of door knob failure. To avoid these issues and extend the lifespan of the door knob, keep a clear area of approximately 10cm in the front of the firebox and maintain your fire underneath the air tubes in the top of the cylinder, this will give the additional benefit of letting the cylinder absorb the maximum amount of heat from your fuel load before it leaves the fire chamber.

    If you are finding the door knob too hot when trying to refuel your fire then you are probably trying to refuel too soon, the door knob is a great indicator of what’s happening within your fire so if you can’t reload then you don’t need to yet. If your door knob is starting to show signs of charring then you are probably burning your fire too close to the door.  

    Do not lean on the door or use it to help you stand up when it is open as this can cause the door to move. If your door does become misaligned then you will need to loosen the top bolt going horizontally through the hinge bar and lift the door back into the correct position for the spindle to line up and then re-tighten the bolt.

  10. Why are gases and smoke entering the room when the door is opened? 18/10/2017

    The most likely reason for this is that your flue is clogged and may require sweeping.

    Other possible causes:

    • You could have a very cold flue temperature. Allow initial start up fire to warm flue pipes. 
    • Loading door opened during maximum degassing of fuel. Wait until flames disappear.