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But if there is one built into the circ and it fails u would have to replace it anyway in my opinion it would be redundant but I guess that's y some put circ on return some on supply. Everyone has their own way I guess.

He is 100% right. That's no place for sharkbites in place of a much more inexpensive and much Better copper to pex fitting. I have seen sharkbites fail in easy to get places.

When I entered the trade was never put a socket to a fixture and never caulk a toilet that's not sitting on concrete. I agree with cadaceus. Just keep ur eye on it and try to. Get rid of caulking if possible

One of the first things I was taught

To its design. That is why check valves go on one side of a boiler and pumps on the other because they r not neccesary with a pump like that

I have rebuilt several. Have you? No it is not a check valve. U r correct but in my opinion acts as one due

If you look back you'll see I said sort of. You just said it will only move water one way. U answered neither of my questions there is NO way enough if any water could get past the impeller the opposite way.

If u installed one on a boiler supply zone facing toward the boiler would that zone get heat?

Have u ever taken one apart and looked at it? It has an arrow for a reason. It WILL NOT push water the opposite way, otherwise y bother with the arrow? I have taken one apart and can tell you the shape of the impeller will only allow water one way. It is more efficent that way

I would absolutely put it under the tub. For under ten bucks well worth saving wood from water that may end up running under tub and rotting the wood. Seal seams with thnset as well

Do you have any Y type adapters anywhere. Cross connection is a great guess. Where on tank is pump? At bottom where OEM boiler drain would. Be

The arrow denotes flow because the impeller will only produce flow one way therefore making it somewhat of a built in check valve. My opinion arrow should point towards tank to constantly force water thru system.

Or even an ungrounded or faulty appliance ie:d\w washing machine. Bottom line. Electric current will cause corrosion which will cause rust which it is somehow doing in urs. Is it at every faucet?

Something is obviously causing the current. Have u had an electrician out to look. It could be simple as a telephone wire grounded somewhere