If your water suddenly becomes too hot, never gets hot enough, or runs cold much sooner than it used to, the thermostat may be one possible cause. But there is an important distinction to make. The thermostat on an electric water heater controls how the water is heated inside the tank. A thermostatic mixing valve performs a different job. It mixes hot and cold water to control the temperature delivered to a fixture or plumbing system. Both deal with water temperature, but they are not interchangeable parts. Riptide Plumbing provides thermostat replacement in Navarre and can also diagnose problems involving thermostatic mixing valves, heating elements, and other components that affect the temperature of your home’s hot water.
On a standard electric tank water heater, the thermostat responds to the temperature of the water in the tank and controls when the heating element operates. Many electric tank models have an upper and lower thermostat because they also have upper and lower heating elements. Some designs use a different arrangement. When everything is working properly, these components cycle as needed to maintain the selected water temperature. If a thermostat stops controlling the heating element correctly, you may end up with too little hot water, no hot water, or water that becomes hotter than expected. The symptom tells us something is wrong. It does not necessarily tell us which component failed.
Several components work together to heat water. The thermostat is only one of them. A failed heating element can create symptoms similar to a thermostat problem. An electrical issue may prevent the water heater from operating. A tripped safety control can shut down heating. On some units, problems with one part of the heating sequence can affect how much usable hot water you receive. That is why we diagnose the water heater before replacing parts. Simply installing a thermostat because the water is cold may leave you with exactly the same problem if the heating element was actually responsible.
These symptoms deserve investigation, particularly if the temperature has changed without anyone adjusting the water heater. Extremely hot water should be taken seriously because it increases the risk of scalding.
People usually call quickly when they have no hot water. Water that is suddenly too hot can be even more important. The U.S. Consumer Product Safety Commission has long recommended a residential water-heater setting around 120°F to help reduce the risk of tap-water scalds, particularly for children and older adults.
Temperature settings are only one part of the picture, however. The temperature inside the storage tank and the temperature ultimately delivered at a bathtub or shower are related but different. That is where temperature-limiting valves come into the conversation.
The names sound similar, which creates plenty of confusion. A water-heater thermostat tells the heater when to produce heat. A thermostatic mixing valve blends hot and cold water. Imagine water entering the valve from two directions. One side is hot. The other is cold. The valve mixes the two streams to produce water within its intended temperature range. That makes a mixing valve useful where controlling the maximum delivered water temperature is important. If you call us about “the thermostat on my bathtub,” what you actually have may be a thermostatic mixing or temperature-limiting valve rather than a thermostat. We identify the component before deciding what needs replacement.
Water-temperature safety is not merely a comfort issue. Current Florida plumbing requirements include temperature-limiting provisions for showers, tub-and-shower combinations, bathtubs, and whirlpool tubs. For showers, approved pressure-balanced, thermostatic, or combination controls are used to limit maximum water temperature. Bathtubs and whirlpool bathtubs also require appropriate temperature-limiting protection unless that protection is already provided through the applicable tub-and-shower valve arrangement. The general limit is 120°F. This is especially relevant during bathroom remodeling because installing a new tub or shower can bring older plumbing into a project where current temperature-control requirements need to be considered.
A pressure-balanced shower valve and a thermostatic valve are not exactly the same thing. A pressure-balanced valve responds to changes in pressure between the hot and cold sides. That matters when somebody flushes a toilet, starts a washing machine, or uses another fixture while you are showering. Instead of allowing the sudden pressure change to create an extreme temperature swing, the valve helps compensate. A thermostatic valve responds to temperature. Both approaches can be used to improve temperature safety when the valve and installation are appropriate for the application. The client commonly recommends upgrading older shower valves to pressure-balanced models during remodels for exactly this reason.
Mixing valves contain moving internal components, and they do not last forever. Possible problems include water that is consistently too hot or too cold, temperatures that fluctuate unexpectedly, difficulty adjusting the mixed temperature, or reduced flow through the valve. Minerals and debris can also interfere with plumbing components containing small internal passages. Before replacing the valve, we want to determine whether the temperature problem is actually occurring there. If every hot-water fixture in the house has the same temperature problem, we may need to look toward the water heater first. If the problem is isolated to a particular tub or fixture, the local valve becomes more likely. The pattern helps us find the right starting point.
This distinction becomes especially useful when discussing mixing valves. Suppose a water heater stores water at one temperature. That does not necessarily mean every fixture should receive water at exactly that temperature. A mixing valve can introduce cold water before the hot water reaches the point of use, reducing the delivered temperature. This type of setup allows storage and delivery temperatures to be controlled separately when the plumbing system is designed for it. For many ordinary residential applications, 120°F is also a common water-heater setting. The exact setup should account for the water heater, manufacturer instructions, household needs, and temperature-control equipment installed in the plumbing system.
If your household suddenly seems to run out of hot water, increasing the thermostat may seem like an easy solution. That can hide the real issue. A failed lower heating element, thermostat problem, sediment issue, or water heater that no longer meets household demand may all reduce usable hot water. Turning the temperature higher can increase scalding risk without fixing the component that actually failed. It is better to find out why the performance changed. If the water heater simply cannot meet the household’s normal demand anymore, we can discuss repair or replacement options instead of using excessive temperature as a workaround.
An electric water-heater thermostat sits behind an access panel near electrical heating components. This is not the same as adjusting a visible temperature dial on some other appliances. The power must be safely disconnected before electrical components are accessed or tested. Replacement parts also need to match the water heater and be installed correctly. If the thermostat is confirmed to be faulty, we can replace the appropriate component, restore power, and check the operation of the water heater. We also want the upper and lower controls to be configured appropriately for the specific unit.
Bathroom renovations create an opportunity to correct older plumbing that would otherwise remain hidden. If you are replacing a garden tub with a freestanding tub, changing the shower valve, or opening walls around older plumbing, we can look at the existing temperature controls before everything is covered again. The client specifically installs thermostatic temperature-limiting protection for applicable tub installations and commonly upgrades older showers to pressure-balanced valves during renovations. Addressing those components while the plumbing is accessible can be far easier than opening a newly finished wall later.
Hot-water problems can come from several directions. The thermostat may be faulty. The heating element may have failed. A mixing valve may no longer regulate temperature correctly. An older shower valve may react poorly to pressure changes elsewhere in the house. Or the water heater itself may simply no longer be performing the way it should. Riptide Plumbing can help determine which component is responsible before replacing anything. If your water is unexpectedly cold, excessively hot, inconsistent, or difficult to control in Navarre, call today. We can inspect the water heater and temperature-control plumbing, explain what is causing the problem, and replace the thermostat, mixing valve, or other failed component when necessary.
We offer a one-year warranty on all plumbing and service work other than drain cleaning, unless the pipes are jetted. Contact us with any warranty questions.
