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What is the difference between models ending on E, C and S?

The units come in various editions named E, C and S according to the specialty of the unit. E is short for Energy whereas C stands for Cold and finally S stands for Steam. E is configured to deliver a relatively high capacity at low energy consumption. C is optimized for cold applications and can operate down to minus 25°C. The C-models only comes in basic configurations but are well insulated and delivered with an external regeneration-heater and special controls to withstand freezing conditions. Some units can be configured with steam as heating source, which can be a more price-efficient solution in the longer run.