Check your incoming water pressure. Does that tank have heat traps on it? I have seen them cause this type of issue before. With the fast close valve on the fixtures and appliances and the traps it will cause water hammer issues.
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What's a "heat trap"?
Tank is a GSW
50 Gal 38,000 BTUH
Don't see anything unusual,
I did try giving it a good hot flush, no improvement
It should have heat trap nipples, most do. Did you use dielectric unions to connect to the piping?
The male stubs could be heat trap nipples, if you sweat the adapters while threaded on to the stubs they could have melted. Around here we are required to install dielectric unions or similar (i.e. brass transition fittings).
You moved the tank from the middle of the house. If the water lines coming down to it when it was in the middle were fairly long. they may have been absorbing the shock. And when you eliminated that drop, you removed the shock absorption ability. Just a WAG.
LKjoel what part of ontario you from?