Did you know that a traditional water heating machine takes almost 20% of your utility bill? To change the situation, you need something energy efficient and more convenient like a tankless model.

If you are about to replace the old tank water heater or change the existing bad-quality tankless one, my guide will help you a lot. I have explained everything one needs to know while finding out the best product among thousands of models.

Based on your demand and the temperature of the groundwater, the size and other features of a tankless model vary. There are more factors to consider, but don’t worry because I have explained them all in the simplest way. Let’s get to know how to choose the best tankless water heater.

Tank or Tankless: Which Water Heater Should You Buy?

Anyone new at buying a water heater for home or office can be at a loss. Due to having advantages and disadvantages of both types, deciding whether to go with the traditional storage tank models or tankless hot water heater seems puzzling. All reputed water heater brands in the market offer both tankless and tank-type water heaters.

I’ve gathered all the information you need to make the right choice. In this section, I am focusing on seven major factors.

1. Quantity of Hot Water

  • Tank: Heating water seems never to be enough when it comes to tank heaters. Because this type is capable of heating a limited amount of water at a time. Big families need more and more water. Once the tank has no more reserved water, you have to wait for a while before a relaxing hot shower. You may also run into a problem in the middle of a nice warm bath when stored hot water runs out. However, installing a bigger tank can provide more warm water.
  • Tankless: With tankless heaters, you will not face the same problem. Because these are instant hot water systems. It means that tankless water heaters would provide hot water as per your requirement. No more running out of hot water while taking a shower again.

2. Multiple Uses

  • Tank: All of us need hot water at multiple points in our homes, for example, bathroom faucet, kitchen faucet, dishwasher, showerhead, etc. Tank water heaters can provide hot water for all these points simultaneously.
  • Tankless: Like tank water heaters, tankless water heaters can’t do that. Tankless heaters have a limited water flow rate which can support two or three points at once but not all. Nonetheless, multiple units or bigger models can solve this problem.

3. Energy Efficiency

  • Tank: The energy factor of a tank heater is 0.4 to 0.6, which means that a minimum of 40% of energy is wasted on both electric tank water heaters and gas tank water heaters. This leads to more costs on utility bills every year.
  • Tankless: The most amazing thing about gas tankless hot water heaters is its energy factor which is 0.82 to 0.98. That means only a maximum of 18% of energy is wasted. Even, electric tankless heaters waste only 0.2% energy making them the most efficient type of all.

4. On-demand

  • Tank: Instant hot water and tank do not belong on the same page. It means that you can’t get hot water whenever you need it. You’ll get it only if the water is pre-heated. These heaters may warm water at night and you won’t even need them. It’s a huge waste of energy and money.
  • Tankless: Tankless Heaters only heat water when you need it, and they do it almost instantly. That’s why these are also called instant water heaters. This feature makes it more convenient for both residential and industrial uses.

5. Initial Cost

  • Tank: The installation cost of tank water heaters is very low. The units are inexpensive and ideal for low-income families. But this advantage is not so fruitful in the long run as the fuel cost or utility bill is higher.
  • Tankless: Initially the cost of tankless water heaters is higher but it saves more money on the utility bill. That is why smart people don’t hesitate to spend some more in the beginning and get more back within 10 or 15 years.

6. Maintenance Cost

  • Tank: Tank heater uses very old technology which has countless flaws. As a result, maintenance costs more, moreover, it usually lasts for 10-12 years only.
  • Tankless: Tankless water heaters are made with the most advanced technology. This ensures customer satisfaction with a 100% guarantee. One unit usually lasts as long as 20 to 25 years easily. Also, the maintenance cost is almost zero for tankless heaters.

7. Space

  • Tank: The last thing to consider is space. Obviously, tank water heaters take a lot of space than tankless heaters. It takes a huge space of your basement or garage, making it a space-hungry product for your home.
  • Tankless: Every household is always in need of a little bit more space. If any product saves a little bit of space, it comes in handy. Tankless water heaters are small in size. So, it easily fits anywhere you want making it perfect for even small apartments. Lots of people prefer them as tankless water heater for RV.

Finally, I want to ask you three simple questions.

“Do you have a low budget?

Can you compromise?

Do you have lots of free spaces?”

If the answer to all those three questions is yes, then you can go for regular tank water heaters.

But I don’t recommend that because storage-type water heaters will give you hot hell instead of hot water. The United States government recommends EnergyStar-certified water heaters for maximum efficiency. And almost all tankless heaters are EnergyStar certified.

Choose wisely and choose from my 10 Best Tankless Water Heaters. I assure you that you won’t regret your decision once you buy after reading individual tankless water heater reviews.

It is not fair to compare only between the tank and tankless water heaters. The truth is that other types are not so efficient and too much costly. For a fair review, I am giving short descriptions of those types.

Heat Pump (Hybrid) Water HeaterSolar Water HeaterCondensing Water Heater
Heat pumps are basically used to heat or cool homes. But hybrid ones can also heat water.Solar water heaters use solar energy to heat water.Condensing water heaters use gas to heat your water.
It uses electricity to transfer heat and two or three times more energy efficient.It’s energy-efficient because it uses the sun to produce the energy needed for water heating.Here heated gas is channeled through a coil so that the water gets the most of the energy.
It does not produce heat. It works like a refrigerator. Captures heat from outside and transfers it to your rooms or vice versa.It uses a closed-loop system to heat water. You’ll need a storage tank and solar collector for the process.It’s energy-efficient because it reuses the exhaust gas again where non-condensing water heaters vent them out.
Heat pumps are useless in colder regions. The outside temperature must be 40°F or above.Solar water heaters are useless in cold seasons and cloudy weather.This type is highly efficient with 103%-107% energy efficiency.
You’ll need at least 7-feet of clear space from floor to ceiling and 1000 cubic feet around it to capture heat from the air.The warm water efficiently in the right condition. But you’ll have the demerits of storage tank water heaters.Condensing water heaters can be both tank and tankless. Tankless ones are the best.
These are not designed to heat water efficiently like tankless water heaters.Installing and maintaining a solar water heater is very costly.It doesn’t require expensive venting like non-condensing water heaters.
Installation cost and product cost are way too high. So, for water heating purposes, you should avoid it.The cost for the setup is so high that you’ll have to wait up to 30 years to recoup your cost.The initial cost is higher than the other types. Otherwise, tankless condensing water heaters are a very good option.

As you have understood that tankless is the best type, you might be confused about which tankless water heater would be best for you: gas or electric? Don’t worry,I am going to compare gas vs. electric tankless water heater below.

Gas Vs Electric: 9 Ultimate Factors to Buy the Best Rated Tankless Water Heater

1. Product Cost

  • Gas: Gas tankless heaters have a higher price point. You have to gather 1000$ or more to get a decent model from one of the top-rated brands.
  • Electric: On the other hand, getting electric tankless water heaters, spending around 500$-800$ can get you a good-quality model. So, initially, electric water heaters are better in pricing.

2. Installation Cost

  • Gas: Installation cost is very high for gas water heaters. In most cases, you would need expert help to install them. Venting and getting a gas line will cost you much more than electric heaters.
  • Electric: As the tankless water heater electric produces no fume, no ventilation system is needed. These units are smaller than gas water heaters and you can do the installation all by yourself. So, the installation cost is far less than the previous type.

3. Operating Cost

  • Gas: Gas prices are marginally less than electricity prices. But the price of gas fluctuates more often and experts predict that it will rise in the near future.
  • Electric: Electricity costs more than gas. But new technologies are playing a big role in decreasing the electricity price. Right now, gas is the winner in terms of operating cost.

4. Energy Efficiency

  • Gas: These are way more energy efficient than storage water heaters. You’ll products capable of energy savings up to 83% which means only 17% of energy will be wasted by gas-operated units.
  • Electric: You’ll be amazed by knowing that electric water heating units are up to 99.8% which is even more energy-efficient than the gas type. These are EnergyStar certified highly recommended water heaters.

5. Maintenance

  • Gas: Tankless water heaters need little or almost no maintenance. Gas-powered ones need annual checking by an expert for safe combustion and performance.
  • Electric: No maintenance is needed for the electric heating system. In the case of hard or acidic water in your area may need an annual check. Otherwise, you can forget about your water heater after the installation.

6. Venting

  • Gas: Natural gas or propane is the energy source for gas water heaters. They heat the water by gas combustion. So, it produces fumes and you need a venting system to guide the fumes outside. It will add extra costs to your installation.
  • Electric: Electric ones run on electricity, which means that there are no fumes you have to worry about. No venting system will save a lot of money during installation.

7. Need

  • Gas: Those who own a large home or have lots of family members should get a gas-type heater. Because they are more capable than the electric ones. So, gas-powered ones are perfect tankless water heater for large home.
  • Electric: Most electric units don’t have the flow rate as gas heaters. Electric ones are particularly ideal for small homes. But there are some electric tankless water heater models in the market that can easily provide hot water for medium and large houses.

8. Safety

  • Gas: Some people don’t feel safe with gas-powered appliances. If the pipes are leaked somehow, then there will be a high chance of explosion. In case, the unit is not checked properly, problems of fuel combustion can cause accidents too. Those who fear gas should consider the electric heating element of a tankless unit.
  • Electric: Electric water heaters are extremely safe for your home. It is safe like all other electric appliances in your house. Also, these devices come with lots of safety features so that the circuit gets cut off before the chance of an accident

9. Environmental Effect

  • Gas: Fossil fuel has a big impact on nature. They are the main cause of global warming. Natural gas and propane are fossil fuels. You might be thinking that individual uses don’t leave any significant footprint on global warming. But it changes when thousands of people use it on a daily basis. The amount is not so small anymore.
  • Electric: Most homeowners choose electric heaters for their efficiency and almost zero impact on the environment. Electricity is clean energy as long as it is produced not using fossil fuel. Right now, the electricity we use from the grid is not 100% environment-friendly. But we are getting closer to better alternatives of renewable energy sources. Unlike the gas models, there is a chance of keeping mother nature intact using electric models.

Finally, I want to say that every energy source has its merits and demerits. You should evaluate your needs according to the points above. If your hot water demand is average, then you should consider having an electric water heater. But above-average demand needs gas water heaters.

I hope that the above comparison has helped you make a decision by now. And congratulations, you’re now 50% pro on water heaters. To be a 100% pro, read till the end without skipping any part.

Now, for my buying guide, I will discuss several important factors. These factors are not in a serial by number. They are organized by very common and frequently asked questions. Hours of experience shared by real users can help you get a clear picture and not regret the decision that you are going to make.

Are Tankless Water Heaters More Efficient?

Yes, tankless water heaters are more efficient than traditional water heaters. I have talked about that point at the beginning of my best tankless water heater buying guide.

Tankless water heaters are more efficient in fuel cost, less costly in maintenance, and more reliable in the long run. But the argument can go on for various types of tankless water heaters. Based on the fuel source, I can give you an insight into the energy efficiency factors for choosing the best tankless water heater.

Fuel Sources

There are two main options. They are electricity and gas. The battle between gas and electricity has already taken place in the previous section. If you have skipped it, you will need to scroll up and read it because knowing the comparison is very important.

For gas water heaters, one can use natural gas or propane. I have also done a detailed discussion on both types, and you can find it in the next section.

Energy Efficiency

First of all, a common question pops up in almost everyone’s mind.

“Are tankless water heaters worth the money?”

Yes, it’s totally worth your hard-earned money; not only for energy efficiency but also for reliability and durability. Storage-type water heaters can be energy efficient up to 60% only. But tankless water heaters can be a minimum of 80% and a maximum of 99.8% energy savings. Electric Tankless water heaters are more energy-efficient than gas models.

But, wait! There is a game-changing fact that I am about to reveal.

Condensing Vs Non-Condensing Water Heater

Condensing gas tankless units are the game-changers. Though gas tankless heaters are powerful than electric ones, they were beaten by electric tankless water heaters in energy efficiency.

The table has been turned with the introduction of condensing gas water heaters. Because they are above 90% efficient and up to 98% efficient. Furthermore, they are EnergyStar certified too.

Now, let me explain why they are so effective at reducing energy costs.

  • Non-condensing Gas tankless heaters vent out the hot exhaust gas. But condensing ones don’t do that. They reuse the condensation produced by exhaust gas to warm the water.  Thus, less energy is needed to warm water in condensing heaters.
  • Moreover, as the exhaust gas is cooled down by reusing it. So, condensing gas tankless water heaters don’t need an expensive venting system. Non-condensing Gas tankless units need expensing ventilation systems because of the hot exhaust gas. Otherwise, the ventilation pipe will be melted.

Where can we get condensing gas tankless water heaters? Follow the link for the best gas tankless water heater (condensing).

What Size Tankless Water Heater Do I Need?

The main advantage of traditional water heaters is that you can use hot water on multiple points simultaneously in your home. Apart from this advantage, all traditional water heaters have lots of disadvantages.

However, it won’t be a lacking of tankless ones if you install more than one unit in your home. But at first, you have to know your daily need and decide what size tankless water heater you need. Here, let me explain it to you in the simplest way possible.


The groundwater temperature is the most important parameter to consider. It means the input water temperature of the tankless water heater.

When you are looking for the best tankless water heater, you have to consider the lowest groundwater temperature in your area. Here, I have shown an average ground temperature in this chart. But try to know the lowest temperature in your area.

I am emphasizing this matter because the water heaters’ flow rate varies according to the input water temperature. Flow rates are described in the next point.

Note: The flow rates you see in the specifications are based on the highest temperature count.

You’ll see temperature consideration in two types. Some flow rates are in exact temperature e.g. input 60°F and output 100°F and some are in temperature rise e.g. 40°F rise. They both mean the same.

My research team has prepared a temperature chart for the top-listed tankless water heaters. See my 10 best gas tankless water heaters and 5 best electric tankless water heaters.

Flow Rate

The hot water flow rate is the second most important factor to consider. If you don’t measure your required flow rate, you’ll experience a sandwich effect. The sandwich effect is the flow of cool water in between hot water. And trust me, you don’t want to have that.

Now, come to the point. There is a chart that shows an estimated water flow for different kitchen or bathroom applications. Water flow is measured in GPM as Gallons per minute. It means how many gallons of water are used by the kitchen or bathroom application per minute.

ApplicationGPM (Gallons Per Minute)
Tub4.0 GPM
Shower3.0 GPM
Washing Machine2.0 GPM
Dishwasher1.5 GPM
Kitchen sink1.5 GPM

But make no mistake. You should measure your home applications’ need for water by yourself. Let me tell you how to do that.

How to measure GPM: Just hold a bottle at a particular point e.g. kitchen faucet or shower and run it for 10 seconds. Now measure the water level in the bottle, multiply it by 6, and you have the GPM flow rate of that outlet. Now, follow the same method for all household applications that need hot water.

The Size You Need

Now, I am going to sum it up about what size tankless water heater you should choose.  You already know the input water temperature in your region and the GPM requirement in your home. Now, it is time to go shopping.

For example, the product you have chosen has the capability of 2 GPM at 70 degrees Fahrenheit in temperature rise. Or 2 GPM when the input temperature is 30°F and the output temperature you want is 100°F. Both mean the same.

Here, let’s assume that your requirement is at least 6 GPM at 30°F input water temperature. So, you will need 3 units of that particular model.

Are you thinking that it would cost too much? In that case, a little bit of compromising can solve the problem. Compromising how?

Say, you could continuously use two showers and two faucets with 3 heaters at 6 GPM. But you are able to buy one. You can compromise by using only one shower or two faucets at a time.

Please note that all the comparisons are done by keeping the worst-case scenario in my mind. For warmer regions, you don’t have to worry that much about GPM.

What Is the Tankless Water Heater Cost for Installation?

Those who are considering a water heater for the first time should get prepared for the cost. In this part, I am going to talk about all known costs for tankless water heater installation.

Cost of Installation

Tankless water heaters have a price range from under 100$ to 20,000$ and some offer free shipping. I only recommend reputed brands and their products so that you can get the most out of your investment.

But it is not wise to choose according to your budget. Instead, I suggest that you choose considering all factors in my buying guide. No matter what the price is, you should choose the best tankless water heater that suits your situation perfectly.

After buying one, you can install the unit by yourself. That depends on how much complexity you can handle. Electric tankless water heaters are easier to install than gas ones. Doing everything by yourself will significantly keep the cost down.

But if you’re not confident, it would be better to call for professional help. Scroll to the end to find a plumber in your area. If all steps described in the product manual are not followed properly, the warranty can be void.

Cost of Operation

The cost of operation means that the expense in your utility bill for the heater you bought. Electric tankless water heaters’ operating costs can be calculated by knowing their power and total hours of service.

For a gas tankless unit, I have done a complete discussion. You can find that in the 10 best gas tankless water heaters. BTU is an important factor here. Every gas water heater has a certain BTU specification. Say, yours is 140000 BTUs.

You’ll need 55 cubic feet of propane or 135 cubic foot of natural gas. That’ll cost you about 20$ to run your natural gas heater for 10 hours at the highest temperature control settings. And your propane heater will cost about 37$. Don’t judge by just seeing that cost estimation. Read the full content linked above and you’ll get a clear picture.

Cost of Ventilation

Electric heaters don’t need venting because they don’t produce fumes. On the other hand, gas heaters need dedicated and sealed venting. They produce very hot fumes. If you install a low-quality vent system, it will be damaged.

But outdoor installation will be required no venting at all. For indoor venting, it can be horizontal or vertical, power-vent or direct-vent, metal or PVC.

  • Horizontal or vertical venting means that the system is installed through the wall or roof. If you want horizontal venting, you’ll need a hole in the wall where the heater is mounted.
  • For vertical venting, you’ll need a hole in your roof. You have to install a venting system from the wall it is mounted to the roof.
  • Power venting means the unit will use indoor air for combustion. Its advantage is it uses only one pipe to vent the hot gas out. But it needs a minimum free space around it. In cold climates, it also can’t perform efficiently.
  • Direct venting is a very good option. It doesn’t have disadvantages like power-vent. This method uses two ventilation pipes. One is for intake outdoor air and another is to vent exhaust gas out.
  • There is a third option better than the power-vent and direct-vent. It’s called concentric venting. It’s like direct-venting but uses one pipe which has both intake and exhaust pipe separately integrated.
  • About the pipe, it can be metal or PVC. Non-condensing Gas tankless unit produces very hot exhaust gas and it needs metal venting. But condensing ones reuse the exhaust gas for more efficiency and produce a lot less hot exhaust gas. This makes the venting a lot cheaper by using PVC pipes.

You now have got an overview of all kinds of venting. For detailed instruction, you’ll find instruction manuals from the manufacturer with the unit. Condensing a gas tankless unit is the smartest choice for you and you can find them in my 5 best condensing gas tankless water heaters.

Accessories Cost

There’s not a thing in this world that doesn’t have problems. And, having a problem is not a problem as long as there’s a solution. Tankless water heaters also have problems. Most of the products run smoothly without any issues. Some units may give you trouble at the beginning and some may later.

Available accessories and replacement parts are the solutions for almost all of my heater-related problems. Please check the accessories section for the available accessories that people need the most. By knowing about all those frequently needed accessories, you’ll be one step ahead.

Warranty Conditions

The warranty of a tankless hot water heater may seem a bit tricky to you. It’s not your fault. I also find it a bit complex. The warranty period varies according to the brand, model, use case, and different parts. All brands give heat exchanger warranty for over 10 years. But it also varies regarding home use or commercial use.

All other parts and components are secured by 5 years warranty and a 1-year limited labor warranty. If the unit is not installed properly, you’ll not get the desired warranty period. So, consult and take help from a nearby professional. Click here to call for help.

Water Hardness

Water hardness means the presence of minerals like calcium or magnesium in the water. This can cause scaling inside the water heater. Most water heaters have sensors to detect scaling.

To solve this problem, you can perform a maintenance check once a year. If you want a maintenance-free solution, you have to use a water treatment system in your home.

Pro Tip: I usually don’t recommend a water treatment system for your whole house. Because they are too much costly. Flushing your heater once a year will easily solve the issue of scaling.

How to Do Tankless Water Heater Maintenance?

This is a concern that comes after buying a tankless water heater. Maintaining a tankless water heater is pretty much easy. I think that available accessories and warranty periods of the water heater you want to buy are very important. Let’s discuss those. One of the biggest advantages to own this device is that the maintenance is very little to none.

First of all, remember that tankless water heaters are not instant water heaters. They are constant. So, whenever you demand hot water, it may take a couple of seconds. Don’t worry as it is normal.

Keeping the filter clean is very important. Do a cleaning of the filter every six or eight months. It’s pretty simple. Shut off the gas line if it’s a gas one or disconnects the electric line if it’s an electric one.

Then you need to isolate the heater by closing all the valves connected to it. Next, you’ll see a small filter beneath the heater. Remove it, and clean it using a toothbrush.

How to Clean the Filter Of A Tankless Water Heater?

Here’s a video to show you how to clean the filter of your tankless water heater easily. The final thing about maintaining your water heater is to flush it every 2 years. Doing it every 1 year is the best practice. The process is simple, and seeing the process is more helpful than reading some steps in an article.

How To Flush A Tankless Water Heater?

Let me suggest you another video that shows an easy method to flush your heating unit. It requires a small circulation pump, two pipes, and a chemical cleansing agent. First of all, isolate the water heater from the internal connections, and open the inlet and outlet valves.

After that, connect the two pipes, and make sure that they are tight enough to prevent any leak. Next, attach one pipe to the pump, leave the other pipe open, and drop both of them in a bucket. Inside the bucket, pour water as well as the cleansing agent.

Then, turn on the pump, and let it do the cleaning for at least half an hour. Finally, cleanse the water heater with clean water, and you will be good to go.

Tankless Water Heater Certifications

All water heaters must have certain certifications. These certifications are proof of product quality, product safety, and energy efficiency. Gas water heaters and electric water heaters have different types of certifications. I will discuss almost all of it.


  • If the electric tankless water heater you bought is independently tested or not is ensured by ETL listing. This also ensures that the product meets all standard requirements.
  • For safety requirements, UL 499 certification is given to electric appliances.
  • CSA certification is internationally recognized and needed for both gas and electric appliances in the USA and Canada.
  • Water sense is another certification that indicates the water efficiency of the product. It tells us that your product consumes 20% less water than other products. If your heater doesn’t have this certificate, you shouldn’t worry too much.
  • For energy efficiency, EnergyStar gives the required certificate. With technological advancement, all-electric water heaters are energy efficient and certified by EnergyStar.


  • All gas water heaters must have CSA certification. For safety concerns, CSA gives certificates to your gas appliances.
  • CSA also ensures that the product has low lead emission and standard sanitation. This makes the heater safe to use for a long time.
  • IAMPO is an international organization and gives certificates based on UPC. This helps you know that your product is examined and maintained for public health safety.
  • Some gas water heaters are so energy efficient and EnergyStar certifies them to help you choose the best one.

See my home page to find out which model has the certifications. Before you go, I have gathered a set of questions that are frequently asked. I also have encountered some common problems. Here, I’ll try to answer those questions and talk about solutions to some common problems.

FAQs: Some Tough Problems with Easy Solutions

I saw scaling inside my water heater.

Solution: At first, you need to know why scaling happens. Some indicate it as the mineral build-up. The problem occurs due to the excessive amount of minerals in the water in your area. With excessive minerals, it is called hard water.

Calcium and magnesium are the main culprits for scaling. Scaling can damage your water heater parts and the warranty will not back up this kind of damage. Scaling also reduces the water flow causing the heater not functioning properly.

One can solve the problem by flushing regularly, or installing water softeners. Water softener minimizes the number of minerals in your water. But if you don’t want to buy that, you can flush the heater once a year.

Corrosion can damage when you’re not looking.

Solution: Tank-type water heaters are generally subjected to corrosion. But tankless water heaters can be a victim too. Usually, tankless water heaters last for almost 20 years but corrosion can reduce their lifespan.

Any kind of leak inside your water heater can cause corrosion. The improper installation also causes the problem. A simple solution to the problem is to install the water heater by a professional and check it annually. To find a professional plumber in your area, just scroll down.

We all wanted hot water at the same time.

Solution: Say, you’re in the shower. Someone in the kitchen turned on the faucet and dishwasher at the same time. If the total flow rate is above the heater’s ability, it’ll cause demand overload.

This can cause the heater to shut down. One can simply solve this by installing multiple water heaters to meet the increasing demand.

It says combustion/ignition failure.

Solution: Combustion is necessary for a gas heater. To heat the water, combustion at any moment without failure is important. Successful combustion can be hampered due to several reasons.

Improper venting systems, lack of gas, and problems in the electricity line are the main causes of an ignition problem.

Check the venting system, see if the propane tank is empty or not, and check the electric line. Exhaust gas is very harmful to the water heater if not channeled properly. This is also a problem that can be solved easily.

I’m getting cold water during my bath.

Solution: While bathing, you are getting continuous hot water. But after a while, you are having some cold water and again hot water. This can totally ruin your mood after a long day of work.

This is a problem that many people face. It usually happens when someone took a shower before you. In the pipe, some hot water remains there.

When you run the shower, you get that hot water. At the same time, the heater also starts heating. But it can’t heat instantaneously. As a result, you get some cold liquid in between continuous hot water. This is called the cold-water sandwich effect. To avoid this problem, run the shower and wait for a while if someone wants to take a shower or clean the dishes.

Problems with exhaust gas

Solution: This problem happens when your heater can’t handle the exhaust gas properly. Anything unusual in the venting system is responsible for this problem.

Check for any kind of holes or blockage in the vent pipe. Also, check the exhaust fan if it’s working properly or not. Call for a professional if the problem is still not solved.

Why the unit has too much noise?

Solution: Many complain that the unit they bought makes too much noise. But this can be solved without breaking a sweat. First of all, check if you have given enough space around the heater according to the manual. Then, check if the flame is light blue and making a clean-burning.

Next, check if there are any leaks in the sealed combustion chamber and the fans are running perfectly or not. Finally, check for holes in the venting, sufficient combustion airflow, and enough gas pressure.

My sink is not running to its full.

Solution: Not only in the sink but also in other applications may not have the full force of water flow. This is also a simple problem. You have to check if your incoming water flow to the heater is ok or not. Check for any plumbing issues in the water-carrying pipes. For this, you might need an expert’s help and you’ll be good to go in no time.

Why the water is too hot?

Solution: This is a serious issue. If you have the slightest doubt, check and solve the problem. Because too much hot water is injurious to the skin. Check for the temperature you’ve set. Sometimes, people accidentally increase without realizing how much they’re increasing. Then, check if the sensors are working properly or not. It may also cause if the water flow is reduced due to clogging or scaling or other plumbing issues. Clear those and your problem might be gone.

I’m not getting the water as the temperature says.

Solution: Getting the water not enough hot is really frustrating. Check for your gas line. Not enough gas or not fully opened gas lines can cause less heat. Lack of combustion gas also causes the problem. Check your venting system and repair any damage. Also, check the output pipes of the heater so that no freezing water is mixing on the way.

Final Verdict

The water heater is not only a need, but it’s also a necessity too. You can also give it as a gift to your near and dear ones. We all look out for our loved ones and try to make their life a little bit easier and more comfortable.

Even if you’re new in this field, I am sure that my tankless water heater buying guide will help you choose like a pro. You can always contact me and give your valuable suggestions. Best of luck!