3 Best Selling Heaters from AOS Bath

By AOS Bath Team
April 10, 2025

Choosing the Right Water Heater? Start with Our Top 3 Bestsellers

Shopping for a water heater isn’t exactly thrilling. But when your comfort, utility bills, and long-term peace of mind are all on the line, it pays to make the right choice.

At AOS Bath, we’ve helped thousands of homeowners find their perfect match. If you're wondering which models truly stand the test of time, look no further. We’re breaking down the top 3 best-selling heaters iight here!

We'll cover what makes them so popular, who they're perfect for, and why home owners in Singapore keep coming back for more.

1. Gen 6 Digital Water Heater: Supercharged Speed Heating

Topping the charts is our Gen 6 Digital Water Heater. If you hate wasting time waiting for hot water, this one is for you.

Save Energy: The built-in control panel lets you fine-tune your water temperature. Lowering to 50º instead of the usual 70ºC helps you save up to 10% energy.

The panel also has a built-in timer so you can adjust your heater to run when you need it to. Never again will you have to endure cold showers in the morning.

Get hot water in 2 min: My personal favourite feature? The Gen 6 heats up in just 2 minutes!!

Compare this with the usual 20 min heating time for a normal storage heater. You get piping hot showers, fast!

This speed heat feature is probably what makes it the most popular choice for HDB and Condos.

Double Your Hot Water! The trade secret 'multiple mode' activates a patented hot water feature.

This doubles the hot water delivery, making sure you never run out halfway!

That's up to four back to back showers with zero complaints.

If you have long hair, thank me later. No more cold surprises mid-shampoo for you.

Pros

Fast Hot Water
• no wasted time, no waiting

Built in Timer
• no need to wake up early to preheat shower.

Multiple back to back showers
• great for morning rush hours

Cons

Wired Control Panel
• can't be concealed for HDB, need to use white casing.

Best for:

• Back to back showers
• Can produce extra hot water if needed

Been using another brand of heater for over 5 years and always felt that the insulator is not working well, the heated water always cools off by morning time. After using AOS, there is definitely difference in insulation and the water remains warm even 24 hours later!

The digital display allows temperature setting to lower and eventually saving electricity. Everything is great!

Katherine Lim

Google review

I am very satisfied with the Gen6 40L storage heater, as the water pressure is not affected during shower and the heat retention is very long as i tested by turning off the power (roughly 10 hours). The instant heat function is much needed and is very useful.

Fareez Farhan

Google review

2. Heat Pumps: The Energy Saving Powerhouse

Heat pumps are the undisputed Kings of Energy Efficiency. This is the greenest heater in our lineup and even more energy saving than solar heaters.

Save $600 on heating every year. Heat pumps pull in Singapore’s warm, ambient air and converts it into energy to heat your water. It runs on less than 75% of energy compared to a normal heater.

Climate Vouchers help you save an Extra $400. Yes, you can use your NEA issued Climate Vouchers on this cutting edge technology.

Because Singapore is hot all year round, heat pumps run at max efficiency here. They are a solid win-win for your wallet and the planet.

Incredibly Long Lifespan: When you invest in a high end technology like this, you want to know it has durability to match.

This is where AO Smith delivers. As the #1 water heater brand in USA, AOSmith’s legendary Blue Diamond tanks have a proven lifespan of over 10 years. In fact, the Singapore record stands at 25 years. Now that’s staying power!

Weatherproof Version for Landed Homes:

If you live in a landed property, even better. You can install the unit at the roof, freeing up precious indoor space. Clean, efficient, and beautifully out of the way!

With a central system, you get lower power load and hassle free maintenance. More on central heaters here.

Pros

80% Lower Running Cost
• Than a storage heater. Uses free, renewable air heat available all year round.

High Water Pressure & Temp
• Good for bathtubs and rain showers

Cons

Large size
• Need to make room for a tank and a compressor.

High upfront cost
• Cutting edge technology doesn't come cheap.

Best for:

• Large families with over 4 members
• Bathtubs and rain showers

After experiencing multiple cold showers with our previous water heater, we decided that it'll be a priority for us to invest in a good water heater for our new home.

After extensive research, we decided on A.O Smith as it was a reputable brand from the US with a long history in manufacturing water heaters. When we headed down to the showroom, we were impressed by the service and knowledge of the staff.

Louis W

Google review

Alhamdulillah! Kalam and Sumon did an amazing job, and we were really hoping against hope that, insya'Allah, the heat pump would fit!

I'm excited for more climate-friendly and comfortable showers! No more dealing with intermittent hot water or waiting for turns like we did with our gas heater.. After three years of waiting, this upgrade feels like a blessing!

Jaclyn Chen

Google review

3. BathBox, Sleek and Modern

Clean Lines: This sleek and modern water heater is built for tight spaces without compromising performance.

Space Saver: Fantastic for BTOs because it doesn’t block your door or your light, and fits beautifully into any minimalist design.

Fast Heating: Don’t let its size fool you! The BathBox delivers hot water in just a few seconds.

It is Energy Saving too! With zero heat loss, the BathBox is 30% more energy saving than a regular storage heater. Take a long shower, guilt free!

Pros

30% Lower Running Cost
Compared to a storage heater. You pay less every month.

Subtle Design Fits perfectly, even in smallest spaces.

Cons

One Shower at a Time
Lower water pressure

Only hand showers
If you want a rain shower, go for the max water pressure option, storage tanks.

Best for:

• Small families around 2 members
• People who don't take very hot showers

Just installed a tankless BathBox at my owner's house. Thanks to the installer, Shamemul, for his patience and cooperation during the installation. The tank looks sleek and space-saving compared to the other heater brands.

Sheireen Sim

Google review

Moez came to help us replace our faulty storage heater with the AOS bath box! So slim and sleek looking. Very pleased with the hot water and pressure in both our toilets

혜민•Jac

Google review

Which One is Right for You?

The best heater depends on your household’s hot water habits and your family size.

What is your priority?

• Do you prefer high temperature and pressure?
• How important is energy saving?
• Will you get a rain shower?

We always recommend choosing based on your priority, not just what’s popular.

Not sure where to start?
Take this quick quiz to find out which water heater is best for you.

Best Fit FAQ

What is the difference between BathBox and Gen 6?

• Size: BathBox is smaller than Gen 6

• Water Saving: BathBox saves more water than heat pumps.

• Rain Showers: are not advised for BathBox. Gen 6 or heat pump water pressure is better, so if you want rain showers, use those heaters instead.

• Energy Saving: BathBox is more energy saving than Gen 6, because there is less heat loss.

Will my water heater affect the water pressure?

Yes, it definitely will. Large storage tanks are pressurised, so you can get maximum water pressure. Examples are the Gen 6 Digital Heater and Heat Pump water heaters.

Small tankless units are not pressurised, so you get lower pressure. Examples are electric instant heaters and gas heaters.

Want to know more about getting the best water pressure for your home? Check this out: 4 Facts About Hot Water Pressure in Singapore.

Can I install a booster pump to raise water pressure?

Using a pressure pump in your home will certainly increase your water pressure but this is not allowed in Singapore. This is because a pressure pump will draw water pressure away from your neighbours.

If all your neighbours are experiencing water pressure problems, it is better to contact Town Council or MCST for a solution. They will be able to help.

Can I conceal my heater in a cabinet?

It is not the best idea to conceal your heater in a built-in cabinet. While it may look neat at first, it often leads to costly maintenance and replacement issues down the line.

In many cases, the entire cabinet has to be dismantled just to access the heater. For the best long term results, it's smarter to install your heater in an accessible location that allows for easy servicing and upgrades.

6 Reasons Why a Tankless Heater May Be Better Than A Storage Heater

So, you’re in the market for a tankless heater. Whether it’s because you noticed a leak in your old water heater, if you think it’s time you replaced your old one, or you’re getting a new one for your new BTO, we’re here to recommend the tankless water heater.

1. No Heat-Loss, Save 30% Energy

A tankless heater only runs when water is flowing. A storage heater pre-heats water for you and stores it in a tank. This tank can lose heat. That is why tankless uses less energy than a storage heater. It can save up to 30%, which is better for your monthly bills.

Apart from lowering your bills, all tankless heaters come with a water-saving device. Your water usage goes down by 20%, and you still have a good shower at 7 litres/min. But just how efficient is the tankless heater?

The National Environment Agency (NEA) introduced the Mandatory Energy Labelling Scheme (MELS) to allow you to compare the two heaters and make informed purchases. The tankless heater has 4 ticks, whereas the storage heater only has 1 tick. NEA estimates that this helps you save up to $120 a year!

2. Space-Saving and Easy Installation

Storage heater comes in tank sizes of 30 to 100 litres. Tankless heaters have no tank, so they take up less space. A small heater is easy to install in a false ceiling as it is space saving. That's why your installation will cost less with tankless.

A bonus with tankless heaters is that you get to skip messy ceiling works that can cost up to an extra $500.

The installation of a storage heater, including ceiling works, is about $1500. Compare this to a tankless heater, which costs about $900 to install.

This is what ceiling works looks like:

Because of this, some creative clients save on huge costs by choosing not to change back to a storage tank. How?

They leave their storage heater in the false ceiling, and get us to fix in a tankless heater in the same false ceiling. We disconnect the pipes from the old storage heater and connect to the new tankless.

Doing this, you can save on ceiling works $200 + removal cost $250. The only catch is that you need to use a hand shower. Rain showers do not run well with tankless heaters.

No problem for most people, some of us prefer hand showers anyway.

3. Tankless Heaters: No Need to Maintain

You need to maintain a storage heater tank every 3 years. This costs about $200 each time. The water needs to be flushed out to clear any sediments that are stuck there. This is the same for all storage heaters.

Sediments make your water yellow so you need to do this. If you have a landed home with multiple heaters, this cost goes up.

With tankless heaters, life is easy. No need to maintain these at all as they have no tank.

Simply enjoying how sleek it is for a water heater. Installer Bee is also wonderful in explaining the various positions for the installation before made my decision in this placement. He also took effort to clean up after the installation works. 👍 ...

Aurgus Chang

Google review

Bathbox installation done by Mr.Moez. Great service by him and really like how clean and neat the Bathbox look

Afiq Hamizan

Google review

4. No Fear of Leaks with Tankless Heaters

Storage heaters can leak and cause damage. This is something every false ceiling owner has to put up with at some point. To prevent this, some choose to change their heaters before they get too old.

This is where the tankless heater shines. No tank = No leaks. That is why the tankless water heater could be an easier choice for you.

5. Tankless Heaters can Give You Infinite Hot Water

Ever wanted to take a long long shower after a long long day? You can do that with the tankless heater. With a tankless, water gets heated non-stop. This means that the hot water you get goes on forever. You can jump straight in the shower, with no worries that you'll run out of hot water half way.
If your family takes long showers one after another, you may run out with a storage heater. A tankless heater however, gives you infinite hot water. It just keeps going, as long as you aren't using a rain shower. You also can't use multiple bathrooms at the same time because of the lower flow rate.

If you are unsure if the tankless is a good choice for you, feel free to take an easy quiz here! We'll help you with that.

6. Tankless is Safer for Kids and Elderly

Sometimes on a rainy day, the water at my shower takes longer to heat up because of the cooler cold water. I get impatient and turn the lever all the way to the left (high) and suddenly, the water is way too hot! I often jump back due to the high temperature and quickly turn the tap off. I bet this has happened to you at least once if you have storage heaters.

Many of us have ageing parents or grandparents. They might not be able to react so quickly. Luckily, the tankless heater has a special function not known to many.

Storage heaters can reach up to 70°C, which is a temperature that can scald. The tankless heater allows you to set it to a safe temperature of 50°C. This temperature control setting protects the elderly from injury as it is not so high. This setting also prevents young children at home from getting hurt.

Why We Choose Stiebel Eltron Tankless Heater

Stiebel Eltron is the # 1 tankless heater supplier in the world. Established in Germany a 100 years ago, they have the best tankless technology. We like these good brands as they make stuff that is durable and long-lasting. An added bonus is how slim it is, allowing it to fit in the tighest space.

In Singapore, our labour cost is high. You don't want to waste money changing to a new heater every 3 years. You want something that can last you around 10 years. Stiebel Eltron can.

We also provide a 3 year full warranty on branded heaters like Stiebel. This is the longest heater warranty in Singapore. The average warranty for other brands are only 1 year.

A good brand is worth investing in. It will spare you the mess that comes with constantly replacing new heaters.

Moez came to help us replace our faulty storage heater with the AOS bath box! So slim and sleek looking. Very pleased with the hot water and pressure in both our toilets

Jac

Google review

Just installed a tankless bathbox at my owner house, Thanks to the installer, Shamemul, for his patience and cooperation during the installation. The tank looks sleek and space-saving compared to the other storage heater brands👍

Afiq Hamizan

Google review

Conclusion

With storage water heaters requiring more maintenance in the long-run, why not stick with the easy way out?

Not only will the tankless heater be a good addition to your household, it will also help save on your energy bills. The tankless heater can do this while giving you good water pressure for comfortable showers as well. It can also keep your family members, both young and old, safe from burns.

The BathBox is worth your time. Simple and direct, just like it's design, your save on space and energy starts now.

Tankless Heater FAQ

How is the tankless heater different from the instant heater?

Tankless heaters are totally different from Instant heaters.

• Tankless has a more advanced technology. They produce better flow rates of 7 lit/min. Instant heaters only go up to 5 lit/min.

• If you have 2 bathrooms, you can use 1 tankless piped to 2 baths. This is the ideal setup for BTOs. If you choose to install an instant heater, you need 2 heaters plus extra pipe work. Instant may end up costing you more, and your shower won't feel as good with the lower water pressure.

How can I test the water pressure for BathBox?

If you want to test the water pressure before deciding on the BathBox, feel free to visit us at our showroom here.

We have a working model available to test it out.

What do tankless / instant heater costs look like for BTO?

3 Best Selling Heaters from AOS Bath

Choosing the Right Water Heater? Start with Our Top 3 Bestsellers

1. Gen 6 Digital Water Heater: Supercharged Speed Heating

Get hot water in 2 min: My personal favourite feature? The Gen 6 heats up in just 2 minutes!! Compare this with the usual 20 min heating time for a normal storage heater. You get piping hot showers, fast! This speed heat feature is probably what makes it the most popular choice for HDB and Condos.

Pros

Fast Hot Water • no wasted time, no waiting Built in Timer • no need to wake up early to preheat shower. Multiple back to back showers • great for morning rush hours

Cons

Wired Control Panel • can't be concealed for HDB, need to use white casing.

Best for:

• Back to back showers • Can produce extra hot water if needed

2. Heat Pumps: The Energy Saving Powerhouse

Climate Vouchers help you save an Extra $400. Yes, you can use your NEA issued Climate Vouchers on this cutting edge technology. Because Singapore is hot all year round, heat pumps run at max efficiency here. They are a solid win-win for your wallet and the planet.

Pros

80% Lower Running Cost • Than a storage heater. Uses free, renewable air heat available all year round. High Water Pressure & Temp • Good for bathtubs and rain showers

Cons

Large size • Need to make room for a tank and a compressor. High upfront cost • Cutting edge technology doesn't come cheap.

Best for:

• Large families with over 4 members • Bathtubs and rain showers

3. BathBox, Sleek and Modern

Clean Lines: This sleek and modern water heater is built for tight spaces without compromising performance. Space Saver: Fantastic for BTOs because it doesn’t block your door or your light, and fits beautifully into any minimalist design.

Fast Heating: Don’t let its size fool you! The BathBox delivers hot water in just a few seconds. It is Energy Saving too! With zero heat loss, the BathBox is 30% more energy saving than a regular storage heater. Take a long shower, guilt free!

Pros

30% Lower Running Cost Compared to a storage heater. You pay less every month. Subtle Design Fits perfectly, even in smallest spaces.

Cons

One Shower at a Time Lower water pressure Only hand showers If you want a rain shower, go for the max water pressure option, storage tanks.

Best for:

• Small families around 2 members • People who don't take very hot showers

Which One is Right for You?

Best Fit FAQ

6 Reasons Why a Tankless Heater May Be Better Than A Storage Heater

So, you’re in the market for a tankless heater. Whether it’s because you noticed a leak in your old water heater, if you think it’s time you replaced your old one, or you’re getting a new one for your new BTO, we’re here to recommend the tankless water heater.

1. No Heat-Loss, Save 30% Energy

2. Space-Saving and Easy Installation

3. Tankless Heaters: No Need to Maintain

4. No Fear of Leaks with Tankless Heaters

5. Tankless Heaters can Give You Infinite Hot Water

6. Tankless is Safer for Kids and Elderly

Why We Choose Stiebel Eltron Tankless Heater

Conclusion

Tankless Heater FAQ

If you want to test the water pressure before deciding on the BathBox, feel free to visit us at our showroom here. We have a working model available to test it out.

The tankless heater is better investment if you have a BTO. The installation will also be neater, with no visible pipes. Here are the approx costs:

Learnt something new? Share it!

Other Posts

Avoid These 6 Warranty Pitfalls at All Costs

6 Ways to Maintain Your Heater so it Lasts 25 Years

Solar vs Heat Pump Water Heaters

Fast Hot Water
• no wasted time, no waiting

Built in Timer
• no need to wake up early to preheat shower.

Multiple back to back showers
• great for morning rush hours

Wired Control Panel
• can't be concealed for HDB, need to use white casing.

• Back to back showers
• Can produce extra hot water if needed

Climate Vouchers help you save an Extra $400. Yes, you can use your NEA issued Climate Vouchers on this cutting edge technology.

Because Singapore is hot all year round, heat pumps run at max efficiency here. They are a solid win-win for your wallet and the planet.

80% Lower Running Cost
• Than a storage heater. Uses free, renewable air heat available all year round.

High Water Pressure & Temp
• Good for bathtubs and rain showers

Large size
• Need to make room for a tank and a compressor.

High upfront cost
• Cutting edge technology doesn't come cheap.

• Large families with over 4 members
• Bathtubs and rain showers

Clean Lines: This sleek and modern water heater is built for tight spaces without compromising performance.

Space Saver: Fantastic for BTOs because it doesn’t block your door or your light, and fits beautifully into any minimalist design.

Fast Heating: Don’t let its size fool you! The BathBox delivers hot water in just a few seconds.

It is Energy Saving too! With zero heat loss, the BathBox is 30% more energy saving than a regular storage heater. Take a long shower, guilt free!

30% Lower Running Cost
Compared to a storage heater. You pay less every month.

Subtle Design Fits perfectly, even in smallest spaces.

One Shower at a Time
Lower water pressure

Only hand showers
If you want a rain shower, go for the max water pressure option, storage tanks.

• Small families around 2 members
• People who don't take very hot showers

If you want to test the water pressure before deciding on the BathBox, feel free to visit us at our showroom here.

We have a working model available to test it out.

The tankless heater is better investment if you have a BTO.

The installation will also be neater, with no visible pipes.

Here are the approx costs: