A feature of the CARBOROBOT Farmer boiler is the large fuel container mounted on top, that is filled manually. With the appropriate fuel, the boiler may operate autonomously even up to few day. The cinder is removed manually at the same time as filling the fuel container. The boiler does not need attention while there is fuel in the container because built in sensors control the autonomous operation. CARBOROBOT Farmer is a real wood pelet model typically designed for use in country areas. This boilers have separate gasification burning chamber to burn wood logs. The burning process in the boiler occur in impulse mode. The firewood burn with high speed and high power. This impulse mode allow burn wood wery clean. The heat will be shepherd to buffer accumulator. The Farmer BIO versions have an agitator built into the fuel container to ensure the smooth flow of the various materials. According to operation modes, there are warm water(3bar 95°C). With separate hot exchanger it also provides domestic hot water.

Biomass boilers -- Farmer BIO version can operate with biomass wood pelet mode. The fuel container filled and the cinder is removed manually.

The boiler operates in a switched-mode fashion, i.e. it is either on or off. This is controlled by the room, or the water thermostat. When the required temperature is reached, the fan stops and the output power is rapidly reduced to 3-5% of the nominal value. The fire does not go out even with several hours of waiting, hence there is no need for a re-ignition unit. When the boiler switches back on, the full power is reached within a few minutes.
A standard flue is adequate for these boilers. Try to avoid using oversized flue as this might cause too high power in standby mode, i.e. when the fan is off. Should this still occur, it is possible retrofit a draft regulator which reduces the flue size. Different programs and control requirements can be implemented with an extra unit.

The quoted pellet consumption per hour values refer to continuous operation. When heat output is not required and the boiler stops, the fuel consumption becomes negligible. The fuel consumption is essentially determined by the required energy output. Experience shows, that approximately 2kg pellets correspond to 1 m3 of natural gas energy. In our climate, an avarage heating season lasts about 1000 hours in a typical building; this can be used to estimate the required fuel quantity.

The installation has to be carried out following the relevant technical and local regulations. In closed heating systems a safety walve max.3bar is necessary. We recommend to use buffer accumulator . The boiler can be used with all kind of pipework, water pumps or heat exchanger. In order to avoid corrosion, keep the return water temperature high, it should be typically 60-70°C. Use a mixing valve to ensure this.

Designed for sensor and motor driven automatic operation, Farmer boilers can function in unsupervised environments. This boilers are modern devices tested to European standard EN 303-5:1999-2012 and use modern wood pelet technology of CARBORBOT Co.