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The HDG F Series 20-25-30 & 40-45-50 are down firing gasification split log boilers.
The F Series 20-25-30 has a 155 litre fuel chamber volume and the F Series 40-45-50, 205 litres. The logs should be seasoned to 20% moisture content (wet scale). If wood is split immediately after felling it is a simple operation, it also dries very quickly if stored in a well ventilated area free from direct rain.
The vertical tube heat exchanger is cleaned by a simple external operating handle, this makes the F Series extremely clean in operation, there is also the option of automatic cleaning. Ash removal is a simple and clean process due to the integrated ash pan.
HDG F Series 20-50 Log boiler range spare part diagrams.