It's unlikely.
You could repair it with silver solder if the hole is not too close to the headers. But hardly any pool guys know how to work with that stuff, and presumably any that do, have sense enough not to try. Because I'm a plumber, I could, but I wouldn't be willing to do so, because the odds are that if it has a hole in one spot, it nearly has a hole in several other spots. If I did it for you, I'd end up charging you a couple hundred to get access and stuff, but then would have to worry it would fail a week later, and you'd want your money back 'because I didn't fix the leak'.
So, the only guys who'd try such a repair are either homeowners with skills, or idiots.
You'd be better off with a new heater, or at least, a new header. BUT, learn your pool chemistry first. 90% of the header leaks I've seen were caused by mismanaged pool chemistry.
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