Of course just conract the AWS and ask for someone locally who has an "R" stamp from the ASME section IV qualifications
Yes, a water heater leaking from the top hot water outlet is a common issue. This can be fixed by checking and tightening the connections, replacing the outlet valve or gasket, or calling a professional plumber for further inspection and repair.
If a hot water pipe is leaking then it will definitely affect the amount of hot water you have, -This is costing you a lot in heating, get it fixed ASAP
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Hot water may be leaking from the faucet due to a worn-out or damaged washer or seal in the faucet's internal mechanism, causing a faulty seal and allowing hot water to escape.
I take it you are talking about the large (header) tank in your loft which feeds your hot water cylinder. If so its the ball valve leaking and needs a washer replacing. hope this helps. Gaz
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To determine if your hot water heater is leaking from the drain valve, check for water pooling around the valve or any visible signs of water dripping or leaking. If you notice these signs, it is likely that the drain valve is the source of the leak.
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This is to allow for expansion of the hot water-- otherwise the cylinder would blow up.