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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.

Running hot water through frozen pipes can help thaw them, but it's not always a guaranteed solution. To prevent pipes from freezing in the first place, it’s crucial to open the hot and cold faucets connected to the frozen pipes and allow a slow, steady stream of water to flow. Additionally, applying gentle heat using a hairdryer or heat tape can expedite the thawing process. If the pipes remain frozen, professional assistance may be necessary to prevent damage.

Whether an earthquake gas shut-off valve is required depends on your location and circumstances. Certain cities, states, and even insurance providers mandate them, especially in areas with high seismic activity. In California, for example, while laws vary by county, most jurisdictions require a valve to be installed in newly constructed homes or when a home is sold or renovated. The Los Angeles Municipal Code specifically requires a licensed contractor for installation. Even if not required by law, installing a seismic shut-off valve is a wise safety measure. These devices automatically cut off the flow of gas during an earthquake, which can prevent gas leaks, fires, and explosions. It is recommended to check with your local building department for specific laws regarding installation, permitting, and inspections, and to ensure the valve you install is on your city's list of approved models.

If your toilet won’t stop running, you might have a bad fill valve. This may be the case if the valve has calcium or debris buildup, is cracked, or shows visible signs of wear and tear. A bad fill valve may also be the culprit if you’ve already checked the flapper and chain and adjusted the fill height to no avail.