Fireplaces

The highest quality

Choosing the best quality You choose the most savings, because our furnaces are made of modern design and of high quality materials, the exterior is well thought out and provides high reliability with a wide dynamic range of operation.

1. There is no universal choice.Each room and layout needs its own technical and aesthetic solution. Contact your local representative for detailed advice.

2. The body of the furnace is designed for heavy loads, which, with proper care, guarantees long and reliable operation

Clean glass 80%

The main amount of air, coming through special channels with the least resistance, passes near the door frame, cooling it, and washes the glass from above, protecting it from soot and performing the role of secondary combustion. 80% of the air is supplied to the glass, so the wide air curtain keeps the glass clean for a long time.

Easy ignition 20%

Part of the air enters the bottom of the combustion chamber for easy ignition and the most efficient combustion. To ignite and maintain a high temperature, the air supply is limited to 20%.

Glass ceramics

The reliability of heat-resistant ceramics for a pleasant view of combustion is achieved thanks to SchottROBAX glass ceramics.

Paint

Senotherm® paint is used to cover the firebox. Because solidification occurs at room temperature, the end user has no inconvenience about smoke and odor when using the appliance for the first time. This makes senotherm® the ideal end-user solution for health and environmental friendliness.

Combustion chamber

The camera is lined with oven chamotte 40mm Wolfshöher Tonwerke GmbH & Co.  Chamotte plates Wolfshöher Tonwerke GmbH & Co have the best physical and technical indicators. For example, Wolfshoehe chamotte has the best indicator of Zeger cone and the number of wet cycles.

No ashpit system

The bottom of the furnace is lined with special ceramics (chamotte or composite fireplace ceramics) to maintain extremely high combustion temperatures (about 1100C) and allows the fuel to be completely burned. The cleaning of the furnace will no longer be a problem, because during normal use cleaning of the ash occurs not more than once a week.

Sealed furnace

All firebox nodes are sealed and the combustion air is supplied through a single inlet duct, which guarantees the best controllability of combustion.

Air supply system

A single air duct allows you flexibly to select the air source into the furnace (external air supply or from the room) and the control method (manual or automatic).  The flow distribution has already proceeded inside the firebox.

Height adjustment

The standard furnace includes high reliable legs for a wide range of height adjustment. Also, to adjust the level of the legs have additional adjusting bolts with hinged heels, which allow you to fine-tune the level and firebox height on any surface. It has easy installation.

                                                How does it work?

The picture shows us a cross-section of a firebox. Arrows indicate the location of air flows. The cross section of the air supply duct provides the optimum air distribution for primary firing and the clear glass system. From the upper duct, air is fed to self-clean the glass, washing it and forming a protective screen, resulting in self-cleaning (soot and dust that settle on the glass is burned as the temperature rises). The material of which the door is made is fully bent with a special groove under the sealing cord, this design prevents air from penetrating through the cracks and ensures that the furnace is sealed. Clean glass system does not break the tightness of the furnace. Especially these technological solutions help the firebox to work effectively.

70x52TM cross-section

Calculation of the furnace power

The power of the heating devices must always be calculated from the room heat loss (actual or calculated). Actual heat losses throughout the day can fluctuate, which can be represented as follows:

Gray: room heat loss

Accordingly to this, a strategy is formed and the necessary equipment is selected to maximally reproduce the heat loss curve by the power generated from the burning of firewood.

Furnaces of air heating are a powerful source of heat and can operate continuously throughout the heating season. The main advantages of such devices are:

• Considerable power that can heat large air volumes in a short time;
• Easy installation, which does not require hydraulics or a stove;
• High reliability and energy independence of the system.

Despite many advantages, the main disadvantage of a simple convective system is its low inertia, which is related to the nature of the combustion and the inability of air fireplaces to store heat. An air fireplace without automatic control of the combustion process will give the heat off as follows:

Gray: room heat loss; red: heat release by air fireplace

At first, there is a rapid firing of firewood, a peak of burning, and then, the same rapid damping, which is prolonged by the heat transfer from coal, which burns for the next several hours. Such heat dissipation does not reproduce the room heat losses very qualitatively, but temperature variations are quite acceptable here, but periodic heating by the fireplace can significantly or even completely solve the heating issue. That is why air fireplaces are the perfect solution for:

• Temporary accommodation, such as vacation homes and holiday homes
• A permanent residence with another main source of heat that equalizes temperature fluctuations

On the technical side, the power of the firebox should be calculated in accordance with the installed system (with or without heat removal ducts) and the heat losses of the premises planned to be heated by the fireplace. Thus, a room with a fireplace will receive the most heat from the fireplace lining and glass.

The power fraction of the furnace emitted through the glass is about 30%. For the fireplaces with glass sizes over 80 cm wide and 60 cm high, this value will increase up to 40-50%. That is, the room heat loss, where the fireplace is located, should be such that heating the fireplace does not create discomfort. For example, if the area of a room is about 35-40 square meters, you can think of the heat loss of about 1-3 kW (this value is statistical and requires separate study in case of installation). From the fraction of furnace power we can see the followings: 3kW / 30% = 10kW rated power. The power of the furnace should not be selected so that its nominal power exceeds that value substantially; at the same time, very low power will not provide enough heat.

It is possible to calculate the amount of heat that will be released during combustion from the number of laid firewood: 1kg of firewood will leave 3.5kW * h of heat. Burning 4kg in 2 hours you can get: 4kg * 3.5kW * h = 14kW * h, 14kW * h / 2h = 7kW.

Long burning mode

During unregulated combustion, the firebox burns too quickly, giving off more heat than the heat exchanger designed for, and also creating uncomfortable temperature fluctuations. To prolong the combustion time in practice we often use the mode of long burning, when due to 2-5% of combustion completeness is achieved a significant increase in the efficiency of heat transfer.  This mode involves reducing the air supply to 1 / 2-1 / 4 from the maximum open flap position after the fireplace has reached intense combustion and the soot from ignition will start to burn out.  In this case, it is possible to prolong the heat output from the fireplace for more than an hour.

WARNING! Long-burning mode is possible and advisable only in the case of high-temperature devices with steel- lined combustion chambers. Low-temperature stone fireboxes will be covered with soot inside if the amount of air is reduced, they will cover the chimney with a thick layer of soot, which can cause a fire.

WARNING!The long burning mode can be used as long as the air supply deficiency will not cause the formation of soot on the walls of the furnace and the glass. In case of its formation, the intensity of combustion should be increased. The use of firebox in smoker-forming modes is prohibited.

The best way to reduce the accidental factor when regulating the air flow for prolonged combustion is to install appropriate fireplaces that regulate the air flow by controlling the temperature in the combustion chamber or the temperature of the flue gas at the outlet from the furnace to the chimney.

Extra glass

Extra glass reduces the radiation through the door by 30% without affecting the fire observation. Due to the double glass in the firebox, high temperature is reached faster for efficient combustion. We recommend you to install a double glass:

1. for large furnaces, or to reduce the risk of overheating of the fireplace room
2. for fireplaces with water circuit and accumulation

Hot air distributor

To get heat from the fireplace into the adjacent rooms, as well as to heat the rooms on the second floor, it is convenient to use a distributor that stores maximum heat for distribution between rooms and does not allow to overheat the room with a fireplace. In addition, the distributor has openings for connecting air ducts.

The distributor is made of stainless steel, 0.5mm thick, which will not change its properties with the years of use.

The design of the rear and side walls will not create any sounds of whack from the expansion of the metal during fireplace work.

Modules

The modules can be installed to extract heat from the flue gases, to increase operating range or to expand functionality:

Quality
Buying Gavryliv & Sons firebox you get a product that is made by the skilled workers and goes through several stages of quality checks. All firebox models are tested on the stand, including stress tests to ensure a high level of safety and trouble-free, happy usage for many years.
Guarantee

By accepting quality as a rule, Gavryliv & Sons accepts product liability, so a five-year warranty applies to all the company’s products.