The HD50i is for internal installation and has a flow rate of 26 l/min at 25 K temperature rise. The HD70e is for external installation and has a flow rate of 32 l/min raised by 25 K. Both units have a forced exhaust system and built-in-frost protection.
Hot water can be provided at temperatures up to 85°C.
Both units are very compact. They have electronic ignition and only operate when there is a demand for hot water. Several units can be manifolded to meet higher demands.
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