6 Buderus Indirect Water Heater Problems, Causes & Solutions

The common Buderus indirect water heater problems are the temperature drop, water leakage, stained water, noise from the boiler, bad smell from the water, and water not getting hot.

Whatever the problem you are facing, you can easily fix it by reading our Buderus boilers problems troubleshooting guide like our Vaughn water heater troubleshooting guide

Buderus Indirect Water Heater Problems, Causes & Solutions

A water heater is one of your house’s most practical systems. But sometimes it’s overlooked. It is always used regularly unless it is shut off for any cause.

And problems might arise, just as with any other product. So here are some of Buderus boiler’s problems, their causes, and the solutions for the issues below: 

1. Temperature Problems

One of the most typical problems with water heaters is the temperature problem of the water. Here are three water heater temperature difficulties with possible causes and solutions: 


  • Lack of electricity, a defective thermostat, or a malfunctioning heating element are the common cold water causes. 
  • The reasons are an insufficient water heater and crossed hot and cold lines. Or it may be a malfunctioning heat source. 
  • Also, the thermostat might be the reason for your water not being quite hot.
  • If the water is flowing too hot, the thermostat is probably significantly higher. 


  • Proceed by rebooting punched electrical systems. Also changing burned fuses to rule out power as a victim. 
  • Next, double-check that all power switches are switched on and that all power lights are on. 
  • Finally, double-check that the thermostat is getting electricity.
  • Switch off the water source. Then switch on a hot water meter to find a split connection. 
  • If the water continues to flow, you may have a divided relationship. 
  • In addition, we suggest consulting a specialist. They will get the job done for you. 
  • Change the indirect water heater thermostat yourself or call a professional to do it for you. 
  • Change the thermostat temperature to 120° F in your water heater. 
  • Incorrect maintenance can cause property damage, personal harm, or even death.

2. Water Leakage

A leaky water heater does not necessitate immediate replacement. But any leaks should be repaired as soon as possible. Even a tiny bit of water can do significant harm. So it’s critical to assess the problem very well. 


Water leaks can be caused by a variety of factors, including:

  • pressure and temperature relief device that isn’t working properly
  • overheating due to insufficient water pressure
  • a jammed valve
  • a pipeline nearby has popped up a leak
  • connections on the heat source are loosened
  • a faulty valve
  • a water tank that is leaking


  • To stop the leakage, look for any evident loose piping links and replace them. 
  • Next, look for any loose heating element nuts and tighten them if necessary. 
  • If the heating element continues to leak, the cover will need to be replaced.  
  • Finally, because storage tanks deteriorate from the inside, look for leaks on or around the tank.

3. Stained Water

It might be alarming to turn on a valve in your house and observe strained hot water. However, water staining may be caused by various factors.

Understanding how to detect them will help you determine if you need to find a qualified plumber.


  • Rust on your tank’s inner side is frequently caused by a malfunctioning anode rod. It can create stained water.
  • You’re undoubtedly dealing with corrosion within your tank if your water starts to become a nasty rust tone.
  • If the water is muddy, it might be due to scale development on the heating components. Or maybe the sediment enters the hot water outlet. 


  • The only method to solve this is to replace the tank.
  • However, the problem may be caused by a failing anode rod, so flush the tank and replace it first to see if it solves the problem.
  • Consult a skilled water heater expert to see whether changing the anode rod would resolve the issue;
  • If not, your water heater should be replaced. 
  • If it remains without treatment, your water heater will almost certainly need to be replaced. 

Changing the anode rod is simple and can extend the life of your water heater by many years.

4. Making Noises

The water heater may be the most overused and underrated mechanical component in a home. The noise of a water heater cracking is one of the most typical sounds it may make. 

When this occurs, it’s typically a sign that your water heater’s tank is blocked with mineral resources and sediment.


  • The most common source of strange noises originating from your water heater is sediment development. 
  • As the water is heated, the most usual is that a development of level in the tank. 
  • And the heating components cause rumble, cracking, and slamming noises.
  • Noise can also be caused by leakage or too much pressure within the tank. 
  • Loud pipes are caused by natural expansion and contraction. 


  • Whether this is the issue, try removing and flushing the tank. 
  • To avoid this problem in the first place, you should thoroughly cleanse the tank every few months.
  • You can try to deal with the problem by cleaning the water heater. 
  • Water heater noises can be caused by regular expansion and contraction caused by heat. 
  • Again, this is safe, but there isn’t a lot of it.
  • If the problems continue after flushing your water heater it is too severe to handle. Then you may need a new water heater.
  • Whenever your water heater makes a noise, it’s usually safe. But it’s always a good idea to check it out for peace of mind.

5. Smelly Water

Customers always complain about terrible smells coming from their water heaters. Water that stinks like rotten eggs is a common tale of these bad smells. 


  • If your water smells terrible, bacteria in your heater may be at blame.
  • If your water flows from a well, this is exceptionally usual.


  • You can boil the water to the highest temperature to destroy all bacteria. 
  • If it doesn’t help, use chlorine bleach to clear it out.
  • If none of this trick doesn’t work, then replace the deteriorating anode rod. 

6. Takes Too Long for the Water to Warm Again

One of the disadvantages of electric water heaters is this. In general, an electric device’s recovery time is twice that of a similar gas vehicle. 

In addition, the longer it takes to heat water varies significantly among versions. In most cases, newer is better.


  • If the hot water is consuming longer than average to restore, there might be a problem with the heating components. 
  • Such as sediment development or the thermostat, and those pieces will need to be changed. 
  • The more time it takes for hot water to reach the valve or bathroom, the further away your water heater is. 
  • A low output restrictor may be put on devices, which might cause the water supply to be delayed. 


  • Maybe your home uses more hot water. In this, you should consider paying for a new model with a higher storage tank. 
  • Or, maybe, you are using an average water heater. Give a thought about buying a branded one. 
  • And, we suggest doing some studies on the tankless vs. tank water heater contrast. 

Best Anode Rod For Softened Water

In residence with soft water, magnesium anode rods are predicted to operate better. On the other hand, anodes are ideal for houses with hard water and a high PH. 

Zinc anodes are great for repairing water heaters. That has already disintegrated if a residence is beginning to smell like rotten eggs.

Aluminum/zinc anodes are 92% aluminum, 7% zinc, and 1% metal ions. They may function in softened water, but most of them usually shouldn’t. 

How To Change The Temperature In Buderus Indirect Water Heater?

An aquastat is a feature of an indirect water heater. The heater is connected to the aquastat. When the aquastat requests heat, the water heater heats up. And a specialized circulation transports hot water from the heater to the temperature unit. 

So either the aquastat is set too low, or it is malfunctioning. If the user is unsure of the aquastat’s location or appearance, he should call a plumber. 

How To Check Water Heater No Hot Water?

A water heater that doesn’t produce hot water is because it isn’t getting enough electricity. Or maybe it has a broken limit switch or defective heating components. 

First, ensure the circuit breaker for the water heater has not failed at the control box. If the circuit breaker has been unable, turn it off and then back on. But still, these could be some causes: –

  • Tank That Leaks
  • Leaks of Gas
  • Theft of an Electric Water Heater
  • Failure of a Gas Valve
  • A thermostat that isn’t working
  • Tank Dimensions

How To Fix Water Heater No Hot Water?

Follow the following simple steps to solve the issue when you find your water heater fails to supply hot water…

  • The water heater in the control box should be turned off.
  • Every thermostat on the water heater has an electric device, insulator, and a plastic protective guard removed. So, touching any wires or electric connections is not a good idea.
  • Check the cables to ensure the power is off. 
  • They must be at the same temperature. The temperature should be set between 115 and 125 degrees Fahrenheit.
  • Using a flat screwdriver, increase the temperature to the appropriate level.
  • Set the other thermostat to the same temperature as the first.
  • For each part, change the safety guard, insulator, and access board.
  • Turn on the power switch for the heater.

Plus, you can watch the tutorial on how to fix the water heater with no hot water.

How To Tell If My Water Heater Is Failing?

The following things will tell you if your water heater is failing or not…

Old Water Heater

Sadly, home instruments are not designed to endure indefinitely. A good water heater should last at least ten years before it has to be changed. Using a water softener and performing routine maintenance might help your machine last longer.


Water damage is something that every householder is afraid of and with good reason. Examine the water heater from all sides, including behind and around it.

Get a specialist to inspect the unit if the water was dripping from any pipes, seeping from the tank, or pooling around it. Toughening some of the wires, regulating the flow, or changing a valve might remedy the issue.

Bringing Dirty or Misty Water

Another problem is if the water is cloudy. Corrosion layers or a metallic scent in hot water might indicate rusted pipes or rust inside the water heater. Leaks are unavoidable if rust eats away at the metal from the inside. 

Temperature Variations in the Water

Several things heater users face in the morning other than having the shower temperature. The water heater may be sending users a message if users find themselves adapting the dial a lot.

Water that suddenly changes temperature from hot to cold is a good indication that you should consider replacing your machine.

How To Turn Off The Indirect Water Heater?

If the water heater is overheating, making weird noises, or acting strangely, it is very essential not to leave it on. The more it runs the worse the situation will become. The more likely you may have leaks, floods, or worse. 

So contact a plumber or a heating expert to check out the water heater and assess the situation. Even so, turning off the water heater until the expert comes to inspect the unit is preferable.

Water should be drained from a water heater tank every three months. To reduce silt, develop, and boost productivity and effectiveness. Here are some basic steps:

  • The water supply should be turned off. Start turning the valve handle clockwise until it comes to a complete stop. Switch off the main water valve for the house if the water does not stop flowing.
  • Heating system for drain water. Connect a tube to the tank’s drain valve at the lower part. Pass the other end of the line to a quieter location where you can safely drain the rusted, hot water.
  • Just let air through into the tank, and open a hot water tap in the house.
  • The pressure switch should be opened. Turn the handle so that it is directly out or up.


Is an indirect water heater worth it?

Although it needs a water tank, indirect water heaters are more suitable for most households.

What is the most common problem with water heaters?

Amongst all the water heater problems, insufficient hot water is the most common. Yet, raising the temperature on the tank’s controller usually solves the problem. 

What is the lifetime of a Buderus water heater?

A condensed heater may last up to 15 years if properly maintained. A carbon steel heater will endure between 20 and 30 years if properly maintained. 

What is the price of a Buderus boiler?

Heater setup costs can range from $4,700 to $11,000 or more, based on the features and demands of your house.

Is Buderus a trusted company?

Buderus heaters are known for being among the highest-quality products on the market. Buderus guarantees are ordinary or considerably under the average for the market.


Hopefully, now you know all the Buderus indirect water heater troubleshooting after reading the whole article. So, whenever you face any problem with your water heater, follow our given solutions and save your pocket.

Well, if you have any quires, let’s know in the comment box.

About William

William is the founder of Fireplacehubs.com. He has real life practical skills in fixing smoker & heating appliance issues. He loves to share his knowledge & helps others in fixing their appliances & saving their money. William firmly believes that anyone can repair his or her unit with the correct guidance & knowledge. See more at about us.

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