Anti-Scald Valves for Showers
Most new bathrooms come with anti-scald valves, but if you’re living in an older house, you might be familiar with the experience of wild fluctuations in the water temperature when someone else in the house draws on the water supply. Anti-scald valves are relatively simple to install compared to other bathroom components that get upgraded during renovations.
The two main types of valves are pressure-balancing valves and thermostatic valves. Pressure-balancing valves are cheaper and easy to find. They detect and compensate for pressure changes in the hot/cold water supplies. Thermostatic valves keep the water output temperature the same regardless of changing pressures. Most of them come with a volume control and some can even be set to maintain a constant preprogrammed temperature.
You should avoid cheap anti-scald valves. Though they can offer some protection, they don’t work as well as the higher-end models.
Source: New Bathroom Idea Book

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