Hi everyone. I'm new to the forum and hoping for some advice. I've just purchased a used Harmon indoor wood boiler. I have a lot of 1" O2 barrier pex that I was hoping to use for plumbing. Can I thread a nipple into the return and one at the output and attach the pex right at the boiler or is the firebox going to be too hot and melt the pex? And if I'm going to have to use black iron to get the pex attachment away from the boiler, how long does the BIP piece need to be?