How to Install a Hot Water Regulator

If your hot water is sometimes too steamy for comfort or safety, you can calm it down by installing either a mixing valve or a point-of use tempering valve, aka a hot water regulator, which mixes hot and cold water to ensure a safe and consistent water temperature.

“It’s a must-have for avoiding scalding, especially in homes with kids or elderly residents,” says Myles Robinson, home expert at UK Composite Doors. Also, “If you’re noticing fluctuating water temperatures or scalding hot water at the tap, the regulator might need attention.”

Hot water regulators can also reduce energy use. In fact, they’re so useful, that in many places they’re actually required in homes. But, before undertaking this task, consider your level of comfort with cutting plumbing pipes and resealing them.

“Installing or replacing a hot water regulator can be complex and may involve plumbing adjustments,” says Pete Duncanson, vice president of training and development at ServiceMaster Restore. “While experienced DIYers might handle it, hiring a licensed plumber ensures safety and compliance with local codes.”

If you think you want to give it a shot, here’s the basic rundown on how to install a hot water regulator.

Two methods of controlling hot water temperature

If your home is plumbed with copper pipe, you can install a mixing valve right at the water heater and set the maximum temperature to 104 degrees F. You may still get some temperature variations due to fast changes in water pressure (such as from a toilet or a washing machine), but there will be no chance of scalding.

“The benefits of a hot water regulator go beyond safety,” says Robinson. “It helps extend the life of your water heater by preventing overheating and excessive wear. Plus, it can make your entire plumbing system more efficient by delivering consistent temperatures.’’

But before you break into any pipes or buy a water heater mixing valve, ask your local building inspector if your code requires “point-of-use” tempering valves at each faucet. These valves may be cheaper than installing temperature-regulating faucets.