Trying to wash dishes or unwind in the bath when there’s no hot water coming from your tankless water heater can be a major pain. While some solutions to hot water problems require an expert, you can solve other hot water woes with a simple fix. So, before you call in the pros, try troubleshooting seven common problems when your tankless hot water heater isn’t working.
There are several culprits behind an underperforming tankless water heater, which might make it hard to get to the root of the problem quickly. Here are the most common reasons for not having hot water in your home—or only having lukewarm water.
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No power source
Low flow rate
Sediment buildup
Flame failure
Frozen pipes
Air supply blockage
It’s time to replace it
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When your tankless water heater is not heating, and you search for a solution, check for the following problems and learn how to troubleshoot them.
Much like searching for a pair of glasses that are on your head, you don’t want to go through the steps of troubleshooting a faulty tankless water heater when the solution is simple—so make sure the power supply is on!
If you use an electric tankless water heater, check the breaker box to ensure that the power source is in the “on” position. For a gas water heater, check your gas valve and your gas bill to be sure everything is up and running.
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If your water initially runs hot only to turn cool—or if it runs hot, cold, and then hot again—there’s a chance your household’s demand for hot water is too high for your tankless hot water heater’s capacity. This is especially true if you notice the temperature change when your home uses multiple hot-water-using fixtures at a time. Having too many hot-water-using fixtures on for your tankless water heater can overload the system, leaving you with cold or lukewarm water.
If you only notice the temperature fluctuations when hot water is in high demand, you might solve this problem by decreasing the number of hot water fixtures you use during peak hot water times in your home. For homes that can’t cut usage during peak hours, you might need to upgrade to a water heater with a higher capacity or purchase a backup water heater.
Just like with your sink, dishwasher, or washing machine, if you have hard water, mineral deposits can ruin the performance of your tankless water heater or the pipes that send the hot water throughout your home.
Calcium and magnesium are the biggest culprits behind mineral buildup, and they can also decrease the lifespan of your appliances by forcing them to work harder. Fortunately, they’re relatively easy to remove. Flush your water heater to stay on top of sediment buildup, and descale your water heater yearly to help prevent your appliances from dying before their average lifespan.
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For gas water heaters, an issue with the flame could be to blame. Your water heater might display an error code to indicate a flame failure. A failure to ignite can prevent your appliance from ever heating your water in the first place, leaving you with cold water.
The first thing you’ll want to do is check that you haven’t run out of propane. If you still have propane, there may be a partially closed gas or water valve. If neither of these DIYable solutions works, you’ll want to hire a water heater company to try to resolve the problem.
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If you use a tankless water heater in cold climates and it’s freezing outside, it may be freezing inside, too—inside your pipes, that is! It’s a good idea to take measures to prevent your pipes from freezing before a problem arises, but if you already have frozen pipes interfering with your water heater, there are some steps you can take to fix them.
If you’re wondering what to do if your pipes are frozen, start by opening the cabinets under your sink to promote airflow, keep the faucet on and dripping when the weather dips below freezing, and use a hair dryer on low heat or even a portable space heater to thaw frozen pipes.
If your water heater can’t properly ventilate or experiences combustion problems, an air blockage may be at fault. Many tankless water heaters have built-in safety precautions in case of a fire hazard caused by blockages in the air supply. Be on the lookout for a suspicious error code on your tankless water heater’s monitor or display when the water fails to heat, and take a quick look at the manual to see if the airflow is to blame.
If there is an error code or you suspect a blockage of sorts, inspect the exhaust lines, intake lines, and ventilation system. Be it a bird’s nest or debris—a blockage in the ventilation system is a potential fire hazard you should clear up right away.
If your tank has seen better years—and you’ve troubleshot every possible solution—then it may be a sign that it’s time to replace your water heater. Gas-burning tankless water heaters have a 20-year lifespan. Electric tankless water heater problems can occur sooner, as they only last up to 10 years, meaning your water heater will need replacing more frequently.
When you’ve tried everything to troubleshoot your tankless water heater only to have no hot water still, you might be wondering when it’s time to call in the pros. Again, you may be better off replacing an older tankless water heater that’s seen better days. A tankless water heater costs $2,200 on average.
If you’d like a pro to diagnose a tankless hot water heater that’s not working, consider contacting a tankless water heater pro near you to see what’s causing the problem. Tankless water heater repairs cost between $220 and $960, or an average of $590.
Source: https://gardencourte.com
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