As filtered water is recommended in the manual and RO is a common method of filtering drinking water, avoiding unremineralised RO water is exactly the thing I expect the manual and the dealer to point out. I know what it's like, you spend hours trying to ensure you're not doing something stupid to save the effort of returning the thing and the bill if it was your stupidity.
However as RO water is well known to cause low water level problems, wouldn't the control box prevent heating up in the first place, knowing that the boiler level sensors might also be being fooled? Or is the RO water is leaching so much copper out of your pipes and boiler everything's all confused


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