If you are not getting any hot water coming out of your taps, the first thing that you need to check is to make sure that you have cold water running out from the taps. If there is cold water, then this problem is something related to your hot water system. Check the isolation valve on your hot water system.
A water heater that produces no hot water might not be getting power, might have a tripped limit switch, or might have one or more failed heating elements.
Over time, sediment can build up in the bottom of the tank, where the burner usually is. This can lead to slower heating or poor efficiency in your water heater, meaning lukewarm water rather than hot water. The solution for this is to drain the tank and to use a water softener.
Sediment Build-Up
As the particles collect on the bottom of the tank, the water heater can't effectively heat your water, resulting in lukewarm water only. To resolve this issue, open the drain valve on your water heater and see if there is sediment. The water will not be clear if there is sediment build-up.
Because there are all kinds of reasons why hot water in a house might be running out faster than normal: power supply problems, rusty pipes, a pilot light out, sediment, a broken dip tube—and that's just to name a few!
The lack of hot water for the shower and elsewhere in the home may be down to several reasons. It could be faulty parts in the water heating unit, an obstructed flue, the build-up of sediment or a malfunctioning temperature control.
Connect a hose to the drainage valve and make sure that you lead it out somewhere safely to drain, knowing this water will be very hot. Into a bucket or outside are your best course of action. Drain and then flush with the cold water valve open until the water runs clear of any sediment.
Tip: The build up of sediment in the tank can reduce your water heater's energy efficiency and also clog your water lines. Avoid these problems and increase the life of your unit by flushing your water heater every six months.
How often should you drain your water heater? It's generally a good idea to drain your water heater at least once a year, according to both BobVila.com and The Family Handyman. If you live in an area with hard water, though, Angie's List says you may need to drain it more frequently.
Flushing your water heater tank certainly has its benefits. While this simple maintenance task will keep your hot water flowing, it can also improve your system's energy efficiency. With an energy-efficient unit, you'll enjoy faster heating speeds — and, potentially, lower energy costs.
Modern tanks contain a check valve on the cold inlet side of the water heater to save energy. It prevents hot water from running up the cold inlet waterline when there is a drop in pressure on the cold side. But new problems come from this.
Turn off power to the water heater, remove the metal cover over the heater elements, and also remove the plastic or fiberglass insulation. Use a continuity tester to check the continuity between the two elements.
The multimeter should read between 10 and 30 ohms if the heating element is working correctly. If you get a very low or zero reading, it indicates a faulty heating element that needs replacement.
If your water heater loses power, your water heater's reset button can be used to turn the appliance back on. However, your reset button serves as a safety device and turns the unit off when the water temperature gets too hot.
Sediment Build-Up
As the particles collect on the bottom of the tank, the water heater can't effectively heat your water, resulting in lukewarm water only. To resolve this issue, open the drain valve on your water heater and see if there is sediment. The water will not be clear if there is sediment build-up.
The Pilot Light Is on But No Hot Water
Luckily, it's usually an easy fix: Just ensure the unit's gas valve is turned all the way on. (No need to touch the gas knob that controls the pilot light itself, since the pilot is working.) If this doesn't fix the issue, your unit may have a faulty thermocouple.
If the resistor is fine, the multimeter will show its value in Ω, kΩ, or MΩ. However, if the resistor is bad or damaged, the multimeter may display 0 or 1. If the value 0 is displayed, the resistor is damaged, and the current can't pass through.
If either one of these is broken, you may not get hot water. You can test whether each heating element is working with a digital multimeter. In general, water that doesn't reach the temperature set is a sign of a bad upper heating element, while hot water that runs out quickly is a sign of a bad lower heating element.