No to draining.
>Turn off circuit breaker to water heater
>Turn off water supply to house (if it's separate from irrigation water) Some like to relieve a little bit of pressure in the lines too.
>And if you turn off the water, make sure to raise the lever in the icemaker to turn that off too. Otherwise it will try to make ice every little while while you're gone.
And upon returning, turn the water back on slowly.
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