What must the inspector check in the plumbing systems?

The inspector must check water heating equipment and fixture conditions because these elements are critical to ensuring the safety, functionality, and efficiency of a home's plumbing system. Inspecting water heating equipment involves evaluating the condition and operation of the water heater, including its capacity, energy source, and any signs of leaks or corrosion. Adequate hot water supply and proper functioning of the heater contribute to the overall comfort and health of the home's occupants.

In addition to the water heater, inspecting fixture conditions is paramount, as fixtures such as faucets, sinks, toilets, and showers need to function properly to prevent issues like leakage, inadequate water pressure, and drainage problems. This inspection helps identify potential plumbing issues that could lead to larger, more costly repairs if not addressed early.

While the other options can be relevant in certain inspections, they do not directly pertain to the fundamental components of standard plumbing systems. Exterior drainage systems focus on managing water flow away from the home, which is more related to site drainage than to plumbing condition. Rainwater harvesting systems, though beneficial for sustainability, are not essential in every home and are more specialized. Solar panel connections, while important for homes that use solar energy, do not fall within the essential scope of a general plumbing inspection.