Options for outdoor tankless gas water heater hookup

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Dmt78

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looking to connect from 3/4” PEX inside to my tankless heater outside.
I know the most popular seems to be copper. I’ve never done soldering before, but I’d be willing to give it a shot. I was at the store and saw the corrugated stainless steel hoses. Are those ok for outside? Could/should I put a threaded fitting at the wall where the PEX exits and use these to the heater? Thoughts?

I'm in crazy hot Louisiana, so freezing not much concern.
 
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John Gayewski

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looking to connect from 3/4” PEX inside to my tankless heater outside.
I know the most popular seems to be copper. I’ve never soldering before, but I’d be willing to give it a shot. I was at the store and saw the corrugated stainless steel hoses. Are those ok for outside? Could/should I put a threaded fitting at the wall where the PEX exits and use these to the heater? Thoughts?

I'm in crazy hot Louisiana, so freezing not much concern.
You can use flex water heater connectors and a sharkbite adapter if you wish.
 
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