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Replaced leaking John Wood 40 imp gal with new John wood 40 imp gal hot water tank recently. Now customer says when burner comes on to heat water, it is too noisy. Is this normal for new tanks. Have installed hundreds of tanks, this the first I've had this complaint.
It has been my experience that this happens when there is a restriction in the gas line. i.e. Flex connector too narrow, inlet screen partially clogged, build-up of pipe dope/tape in one or more connections, etc. You'll have to do some investigating for a restriction.