< CAPACITY PRIMARY CIRCUIT SECONDARY CIRCUIT MODEL WORKING TEMPERATURES OPERATING TEMPERATURES 20000 KCAL/H 90/70°C 10/60°C 503-7 25000 KCAL/H 90/70°C 10/60°C 503-7 30000 KCAL/H 90 /70°C 10/60°C 503-9 35000 KCAL/H 90/70°C 10/60°C 503-9 40000 KCAL/H 90/70°C 10/60°C 503-9 45000 KCAL/H 90/70°C 10/60°C
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