What might a plumber look for when inspecting for leaks in a hot water system?

When inspecting for leaks in a hot water system, a plumber often looks for corrosion on fittings and pipes because this deterioration can indicate areas where leaks are likely to occur. Corrosion weakens the material of pipes and fittings, making them more susceptible to leaks. Additionally, corroded areas can accumulate moisture, which can be a clear sign of an existing or potential leak.

While unusual noise from the heater, low water pressure in fixtures, and blocked drainages can indicate problems within a plumbing system, they are not direct indicators of leaks in the same way that corrosion is. Unusual noises might suggest issues with the water heater itself, while low water pressure can result from various factors, including blockages or pipe damage, but does not specifically point to a leak. Blocked drainage systems can lead to different plumbing problems, but again, they do not directly indicate leaks in a hot water system.