Water Heater side tap for return water from First Co 24VAQ3

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Northern Virginia
I have First Co air handler 24VAQ uses hot water loop for heating. My question is, can I install a brass 3/4 Tee at the side tap drain valve of the water heater for the water return side from the air handler heating coil? This would be instead of "Tee on the top of the water heater on the cold side. The hot water supply to the air handler would still come from the top of the water heater. I also wanted to do this to make it easier to flush the heating coil and the water heater.
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Hey, wait a minute.

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