I've not looked at my H2O to see if there is a date of manufacture, but one some electronics (like my computer monitor) have a date of manufacture printed on them someplace and as long as the warranty is good from the date of manufacture, you don't need a receipt. I had a monitor fail and I did not have the receipt, but because the date of manufacture was on the monitor and it was still within the warranty period, I was able to get it serviced.
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