Water fireplaces

Home » Water fireplaces
Water furnacesModelsWhy do people choose us?PlanningConnection systemQuality
Water furnaces

Choosing the best quality you choose the most savings.

The best way to collect heat effectively from a fireplace and distribute it indoors is to install a firebox with a water circuit with a buffer. Using such a fireplace does not differ from ordinary air fireplace, but the accumulated heat in the buffer warms the house for longer time.

The design of Gavryliv & Sons fireplaces provides the maximum flame view from all angles, so the fireplace will create a romantic mood for pleasant and unforgettable moments.

Why do people choose us?

 How does it works?           

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

76x62WM cross-section

You should carefully choose a fireplace for the house, because it will serve as a source of heat and comfort. The power and dimensions of the furnace should be chosen with taking into account the needs of the fireplace room, the method of distribution and the heat retention, because the desire to install the big firebox in a small room will lead to its rapid overheating and the effect of sauna, and the effort to reduce the power will lead to dirty glass and odor.

Calculation of the furnace power

The heat released from the burning of firewood first enters the room with a fireplace through the glass. The temperature of firewood combustion and pyrolysis gases can be 900-1200C, depending on the efficiency of synthesis and wood. Further, hot flue gases, which are evenly heated to a temperature of 600-800C, leaving the combustion chamber enter the heat exchanger, where through the steel walls they transfer heat to the water, circulating in the walls of the furnace and the heat exchanger. When heated up to 70-80C, the water carries heat that can be used immediately for house heating and domestic purposes, or stored in a storage tank for later use. The flue gases are cooled to a temperature of 180-220C and reach the chimney.

The power portion of the furnace emitted through the glass is about 30%. If the glass is double, then this proportion is reduced to 18%.  The remaining heat can be transferred to the furnace surface or the water circuit.

For example, if the room area is about 35-40 square meters, you can expect heat losses of about 3kW (this data is statistical and requires separate study in case of installation). From a fraction of furnace power it follows: 3 kW / 30% = 10 kW of capacity. The furnace power should not be selected so that its capacity exceeds that value substantially; at the same time, very low power will not provide enough heat.

The nature of wood burning implies nonlinearity of heat output, so characterizing it, we present a chart of burning:

Instead, the room heat loss is about the same as the previous hour and the next. We can ensure that the room is heated evenly by the heat from the fireplace by redirecting that heat and being able to accumulate extra heat, and then use it in the future.

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 4 kg in 2 hours you can get: 4 kg * 3.5 kW * h / kg = 14 kW * h, 14 kW * h / 2 h = 7 kW.

Accumulating buffer tank

The house does not always have the same and even heat consumption: weather changing and time of the day significantly affect the amount of heat that is needed to maintain a comfortable room temperature. On the other hand, the firewood in the fireplace burns unevenly, we do not always have the time and desire to put firewood in the fireplace, so different amounts of heat are released from burning during the day. To maintain a comfortable temperature and efficient combustion, it is necessary to use accumulating buffer tanks, which allow to store and accumulate all the excessive heat from firewood burning, and after a while, when the fire goes out and the fireplace will not give the heat, maintaining the temperature in the room with the help of stored heat.

In accumulating buffer tank, the water can be heated up to 80C. If the temperature of operation of heating system is about 40C, so the temperature difference will be 40C. Accumulative capacity of 500L ~ 23.3 kWh, which can be used in the future.

In most cases, you should choose a tank of 30-50 liters per 1 kW of power of the water circuit. You can choose a smaller volume if the furnace power is not so high compared to the house heat loss (30l per 1kW) or larger if the house has a small heat loss (50l per 1kW).

Calculation of firewood consumption


If home heat loss is known, you should also consider the amount of firewood consumed during the heating season. This issue is important because if the house heat losses are too big, then a fireplace as the main heating source may be impractical. In any case, the calculation of the amount of firewood per heating season should be done, as you need to know in advance the upper limit of possible consumption. Of course, the amount of wood depends directly on many factors, such as: the area being heated, the temperature outside, the humidity and the breed of firewood, as well as their quality. However, for an average insulated house with an area of 150 sq. m., we have to store about 10 metric skladometra of solid wood.

Sometimes this can be calculated by design data. House of average isolation 150 sq.m. in cold period loses about 7kW of heat. So, this is exactly what we need to compensate. 7 kW: 3.5 kW * h / kg = 2 kg per hour. In this case, we will burn 2 kg * 24 h = 48 kg of firewood every day. If we put firewood 4 times a day, we get: 2 kg * 24 h / 4 times = 12 kg – this is the firewood weight for each time.

Connection system



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.


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