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There are three main types of shower valves: pressure-balancing, thermostatic, and diverter. Pressure-balancing and thermostatic valves are both considered mixing valves because they regulate water flow and temperature, but they do so in different ways. A pressure-balancing valve senses changes in water pressure, such as from a flushing toilet, and adjusts the incoming hot and cold water to maintain a consistent temperature; these typically use a single knob. A thermostatic valve uses a thermostat to precisely control the water temperature and requires a separate control to adjust the water volume. A diverter valve directs the flow of water from one fixture to another, such as switching from a tub faucet to a showerhead in a tub-shower combination.

The answer is mixed when it comes to whether you can expect your home warranty to cover a shower pan leak. While a home warranty is designed to cover costs for the repair or replacement of appliances and major home systems, most plans don't cover water damage. However, plumbing may be covered. When looking at home warranty versus home insurance, it's helpful to know that most homeowners insurance policies do cover sudden and accidental water damage originating from inside the house. 

You should replace your showerhead if you notice issues like low or inconsistent water pressure, leaks, rust, sediment buildup, or mold. These signs often point to internal problems that cleaning cannot fix and can even pose health risks, particularly in the case of black mold. You can also replace a showerhead at any time for an aesthetic upgrade or to get more features.

A new showerhead offers several benefits. It can improve water pressure while conserving water, save money by stopping leaks, and enhance your bathroom's appearance. It's an easy and affordable way to improve your showering experience. For more functionality, consider models with additional spray settings or a detachable head.

Note that some symptoms may indicate larger problems. For instance, significant sediment buildup could mean you need a water softener, and persistent low water pressure might signal an issue with your water heater.

To know if your shower pan is bad, look for signs that your shower pan is leaking. If your pan moves under your feet, there’s likely damage below it. Other signs of serious damage include visible cracks or the pan moving up and down when you step in and out of the shower.

Take quick action if you notice water stains on the ceiling or seams below the shower. If the base of your shower is always leaking or you have moldy grout by the base, call a pro to check it out.