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|Supplier's index||KEL 409303|
Keller boilers with water grates are designed for operation in open water central heating systems. They have been adapted for the high-efficient combustion of hard coal of the pea and nut type. However, it is also possible to heat with the use of substitute fuel: lignite and weathered wood. The adjustment of the combustion process is carried out by the thermostatic power regulator (draught regulator).