A tankless hot water heater is a good thing to have because it saves space and money. It does not need a tank for hot water storage, which means that it uses less energy than traditional heaters. However, there are some things that can cause a tankless heater to go cold.
The design of a tankless water heater was created to make life easier. However, there are some problems with this type of system that people should be aware of before purchasing one. The most common issue is when the temperature sensor goes out or stops working. This causes the unit to shut off and not produce any hot water until it has been repaired or replaced by an authorized service technician.
The tankless water heater is a great investment with many benefits, but one of the biggest gripes is that it can go cold. The reason why this happens may be due to some simple fixes on your part or there are other possible reasons for this situation. A common cause could be low pressure in the home; however, you should also consider how often you use hot water and what type of system has been installed on your property.
In this article, you will discover why your tankless hot water heater goes from hot to cold and how to fix the problem.
- How a Tankless Water Heater Works
- Why does my tankless hot water heater go cold?
- Reasons your Tankless Hot Water Heaters go Cold Sometimes
- Why does my Rinnai tankless water heater go cold after a few minutes?
- Ways To Keep Your Tankless Water Heater Warm All Day
- What is a cold water sandwich effect?
How a Tankless Water Heater Works
It helps to have a basic grasp of how tankless water heaters function to understand why yours would go cold on occasion. Tank water heaters are probably nothing new to you. Heaters that heat and store water have been around for a long time. The typical tank water heater in a home has a capacity of 30-50 gallons. That explains their enormous size!
Tank water heaters, as you might expect, waste energy by heating water that doesn’t need to be heated. Standby energy losses can have a significant impact on your monthly energy costs.
On the other side, tankless water heaters preserve energy while also saving you money. Tankless water heaters are compact since they don’t have a storage tank and instead heat water as it is needed.
The hot water is only available when you need it, similar to having “on-demand” hot water at your fingertips when you need it. Your tankless system’s flame ignites the heat exchanger when you turn on the hot water faucet. After that, cold water enters your water heater through an entrance pipe at the base.
The water circulates through the device, picking up any stray or “secondary” heat that may be present. Your tankless water heater system achieves the correct temperature by first passing the water through a main stainless steel heat exchanger. The tankless system’s hot water is now ready to be delivered throughout the home’s plumbing.
Why does my tankless hot water heater go cold?
Reasons your Tankless Hot Water Heaters go Cold Sometimes
A lot of people ask why their tankless hot water heater goes cold when they turn it on and this question may become more common as the weather gets colder. Here are the reasons why your tankless water heater water goes from hot to cold.
Improper gas line size
Dirty filter on the cold water inlet
Clogged heat exchanger
Low Water Pressure
If the water pressure is low, then it can be hard to maintain a constant temperature. Gas burners should be turned off before turning the hot water heater off.
Low water pressure is when the flow rate of a faucet or showerhead falls below its activation flow rate. This can cause some issues such as low-pressure washing and leaks in appliances.
The water pressure in a tankless heater is controlled by the size of the pump. The bigger it is, the greater its ability to move water from one point to another and produce hot or cold temperatures based on user settings. In order for this system to work properly, only certain models are able to withstand high amounts of power consumption without compromising performance.
When installing a tankless water heater, you must ensure that there is enough proper gas pressure coming in to turn on your system. Check all of its sensors, wiring fuses, and components before making any repairs or replacing them because they could be burnt out.
A single-lever faucet is not designed to work with a hot and cold water line. When the hot water is turned on, it will drain out of the cold side. The solution to this problem would be replacing or repairing the plumbing crossover that connects both lines together
If your water temperature fluctuates from hot to cold or if you have a single-lever faucet and the washer has failed, contact a local professional today.
Cold Water Sandwich
A tankless water heater is a device that makes hot water from cold water. It takes little time to heat the cold water, so it will get too cold and stop working. The most common reason why your tankless hot water heater stops heating up is that you have not run enough hot tap for long enough time or there has been a power outage in your area.
The tankless water heaters will gradually heat the cold water. The time it takes for the hot water to reach 100 degrees Fahrenheit in about 4 seconds. Sometimes your hot water heater will go cold before the tank starts heating again. One of these reasons could be that there’s an air leak or that something has blocked it from running properly.
A tankless water heater could go cold when there is a leak in the system. This can be inconvenient as it means you cannot use hot water for showers and other purposes.
Why does my Rinnai tankless water heater go cold after a few minutes?
There are a number of reasons why your Rinnai Tankless Water Heater isn’t working properly, the most common of which being incorrect installation or maintenance. But don’t let that get you down. It’s easy to take care of cold water sandwiches and filthy water filters on your own.
It’s possible that a plumber is required, though, when dealing with a defective heating element or an inadequate gas line. Check your system’s error codes to see if there are any additional surprises there, too. If you aren’t sure what to do, contact a local professional today.
Ways To Keep Your Tankless Water Heater Warm All Day
What is a cold water sandwich effect?
- Take shorter showers
- Keep your tankless system clean by blowing it out once a month
- Be careful not to mess with the temperature dial on your tankless water heater
- Avoid using hot water for things like washing dishes or brushing teeth
- Try to limit the number of people using hot water in your house at one time