nicktheplumber
If you have galvanized pipes that are more than 40 years old, they are probably narrowed with rust and/or scale. The hot water lines tend to scale up first, and the narrowing is usually the worst at change-of direction fittings (like elbows and tees at stub-outs). The tank, if it’s more than 10 years old could also be scaled and/or rusted.
An easy problem to fix is clogged faucet strainers and shower heads, but this would not selectively restrict flow in only the hot water to fixtures.
