Otis Singleton
Electric shower temperature control issues can be frustrating, especially when all you want is a warm, relaxing shower. Shower temperature control valve problems are common in modern bathrooms, and there are several factors that could be causing this issue. The most obvious cause of fluctuating water temperatures is simply running low on hot water. This could be due to an undersized water heater or multiple people using hot water in a short period. If this is the case, wait a while for the water heater to fill back up. If your shower has a single-control lever, you likely have a pressure-balancing mixing valve, which adjusts the ratio of cold to hot water pressure without sensing the temperature. This can make it difficult to find the perfect shower temperature. In this case, consider switching to a thermostatic mixing valve, which directly senses and controls water temperature. If you'd like to adjust your current thermostatic shower temperature, you can do so by placing the temperature control over the spindle and turning it accordingly. If your shower still isn't heating up, you may need to replace the temperature control valve, which can be done at home with some technical skill and the right tools.
Characteristics and Values Table for Fixing Electric Shower Temperature Control
| Characteristics | Values |
|---|---|
| Problem | Fluctuating water temperatures |
| Cause | Running low on hot water from the water heater |
| Solution | Wait for the water heater to fill back up |
| Adjust the scald guard | |
| Switch to a thermostatic mixing valve | |
| Replace the temperature control valve | |
| Adjust the thermostatic shower temperature |
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What You'll Learn
Identify the problem: Is your shower electric or thermostatic?
Before you attempt to fix your shower's temperature control, it's important to identify the type of shower you have. This guide will help you determine if your shower is electric or thermostatic.
Electric showers typically have controls that consist of a box on the wall, with a knob or dial to adjust the temperature. They usually have a simple interface, and you may need to adjust the settings each time you shower to get your preferred temperature. Electric showers heat water instantly as it passes through the unit, so they don't rely on a stored hot water supply.
Thermostatic mixer showers, on the other hand, often have two controls: one for water flow (pressure) and another for temperature. They usually have a button to prevent the temperature from being set too high, ensuring safety and comfort. These showers blend hot and cold water to maintain a constant, pre-set temperature. They are more complex in design and often feature safety mechanisms to prevent scalding.
If your shower has a single-control lever, you likely have a pressure-balancing mixing valve. This type of valve doesn't directly sense or control the temperature; instead, it adjusts the ratio of cold to hot water pressure. As a result, finding the perfect temperature can be a guessing game and may require some experimentation.
By understanding the type of shower you have, you can better identify and address any issues with temperature control. Remember, always exercise caution when adjusting your shower's temperature to avoid scalding or discomfort.
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Adjust the scald guard
Adjusting the scald guard is a good way to fix electric shower temperature controls. Scald guards are also known as "rotational limit stops", and they help to keep the water at a safe temperature. They are usually found in the cartridge of the faucet.
To adjust the scald guard, you will first need to remove the faucet handle. This will involve locating the set screw opening that is along the side of the faucet handle. Use a hex key to rotate the screw counterclockwise until you can pull the handle from the faucet.
Once the handle has been removed, you will need to grasp the sleeve around the faucet cartridge and pull it off to expose the cartridge body. Inside the cartridge, you will find the scald guard. The scald guard is a small plastic disk with notches. To increase the water temperature, turn the scald guard counterclockwise. To reduce the water temperature, turn it clockwise.
It is important to note that each slot on the scald guard represents a 4 to 16-degree difference in water temperature. The cartridge is designed to restrict the placement of the scald guard to prevent it from being rotated too far in either direction.
After adjusting the scald guard, replace the plastic disk in the faucet by sliding it onto the faucet stem. Push the sleeve over the faucet cartridge and replace the handle. Tighten the set screw to secure it in place.
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Check your water heater
If you're experiencing issues with your electric shower temperature, it's a good idea to check your water heater.
First, if you have a gas-powered heater, check if the pilot light is on. If it's not, you can try to relight it. Turn the gas valve to the off position, wait a few minutes, then turn the valve to "pilot" and ignite the pilot light using either the onboard ignition switch or a stick lighter. Once lit, return the valve to the standard position. If the pilot light keeps going out, consult a professional.
For electric water heaters, check if the breakers have flipped. If so, simply flip them back to restart the heater.
If you have a tank-based heater, it will maintain water at a consistent temperature, even if no hot water is used. On-demand water heaters, on the other hand, only heat water when needed, supplying around 2 to 10 gallons of hot water per minute, depending on the model. If you have an on-demand heater, it may be struggling to keep up with your home's hot water demand, resulting in inconsistent shower temperatures.
Another common cause of inconsistent water temperature is when another water demand is initiated elsewhere in your home, such as running the dishwasher or washing machine. This can cause a cold water sandwich effect, where the heater runs hot, then cold, then hot again. To address this, try spacing out water demands or consider upgrading to an on-demand water heater with greater output.
Over time, mineral deposits like carbonates, rust, and oxides can build up in your water heater, affecting its performance. To prevent this, it's recommended to use a descaler cleaning kit every 12 to 18 months to remove these deposits and preserve the life of your heater.
If you're experiencing issues with your shower temperature, it's worth checking your water heater for any of these potential problems. However, if you're unsure or uncomfortable performing these checks and adjustments, it's best to consult a professional for assistance.
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Replace the temperature control valve
Before starting, gather the necessary tools and materials: a replacement cartridge (ensure it's compatible with your shower system), an adjustable wrench or pliers, a screwdriver, an Allen wrench (if required), and a clean cloth or rag. It is important to note that replacing a shower valve typically costs between $125 and $500, depending on the type of valve and whether you hire a professional. Labor by a professional plumber usually costs about $165 when replacing a valve with the same type, or about $225 when upgrading to a new type of valve.
First, turn off the water supply to the shower at the main water shut-off valve. Place a drop cloth in the shower or tub to protect the floor and block off the drain to prevent screws, washers, and other small parts from being lost. Remove the screw cover from the center of the shower faucet handle using a flat-head screwdriver. Next, remove the escutcheon plate, which is the metal portion between the shower handle and the wall, using a standard screwdriver to loosen the screws. Once the plate is removed, you will have access to the cartridge valve.
Turn off the water supply valves on either side of the central opening. Remove the old cartridge assembly by loosening the retaining nut with an adjustable wrench or pliers and pulling it out. Pay attention to the orientation of the cartridge as you remove it. Before installing the new cartridge, inspect it to ensure it matches the old one in size and design. Apply a thin layer of food-grade silicone grease to the O-rings on the new cartridge for lubrication and a watertight seal.
Carefully insert the new cartridge into the valve body, aligning it correctly with the water inlet and outlet ports. Hand-tighten the retaining nut onto the cartridge to secure it in place. Position the new replacement cartridge assembly in the housing at the center of the pipe system and replace the bonnet nut, tightening it clockwise. Return the water supply valves to their normal position and fit the escutcheon plate back into place. Finally, fit the faucet handle back on top of the valve, tighten it well, and put the screw cover back on top of the handle, pressing it downward until it clicks into place.
Once the replacement is complete, gradually turn the water supply back on at the main shut-off valve. Allow the water to flow through the system and check for any leaks around the cartridge. Turn on the shower and test the temperature to ensure it is consistent and comfortable, adjusting the temperature settings if necessary.
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Upgrade to a thermostatic mixing valve
If you're tired of the guessing game of trying to find the right shower temperature with a single-control lever, a thermostatic mixing valve could be the solution. This type of valve offers two handles: one to control water flow (pressure) and the other to control water temperature.
Thermostatic mixing valves work by sensing and directly controlling the temperature of the water, providing more precise shower temperatures. They blend hot and cold water, and the temperature can be adjusted by changing the amount of hot and cold water that is mixed. This is in contrast to pressure-balancing valves, which only adjust the ratio of cold to hot water pressure without sensing the temperature.
Thermostatic mixing valves can be pre-set to your desired maximum temperature, ensuring safety and preventing scalding. They also allow for complete control over water flow, making it easy to increase or decrease the flow of water. Additionally, they prevent drops in water pressure when other water-using appliances are in use, which is a common issue with pressure-balancing valves.
While thermostatic mixing valves offer advanced features, they tend to be more expensive than pressure-balancing valves. Prices can vary depending on fit, finish, and country of origin. Installation may also be more complex, especially if you are retrofitting an existing shower or if your plumbing is not equipped to handle the valves. It is recommended to consult a licensed plumber for proper installation.
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Frequently asked questions
If your shower temperature is either too hot or too cold, your shower temperature control valve may be faulty. This is a common issue in modern bathrooms.
If you think your shower temperature control valve is faulty, you should contact a professional to fix it. You can find a suitable tradesman in your area by using a website like Fixington.
If your shower doesn't have a temperature control valve, it may be a pressure-balancing mixing valve. This type of valve doesn't directly control the temperature of the water but adjusts the ratio of cold to hot water pressure. You can identify this type of valve by its single-control lever.
First, remove any protective caps on the side of the control with a flathead screwdriver. Then, use a Phillips screwdriver to unscrew any screws inside the temperature control cover. Place the temperature control over the spindle and turn it according to the indicators to make the shower hotter or colder. Finally, replace the cover and protective cap, and retighten the screw.
