That should work, to get the temp up, but in the long term I'd measure what temp you are getting and consider swapping the hot water thermostat.
if it's new, try to measure the temperature normally, if it is definitely too low, take it back. i got a digital thermometer cheap off ebay
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if it's new, try to measure the temperature normally, if it is definitely too low, take it back. i got a digital thermometer cheap off ebay