Let's Compare Heat Recovery.
Instant
0 minutes
Tankless
0 minutes
Storage
10 minutes
Tankless water heaters offer you a virtually endless, on-demand supply of hot water, making "recovery time" irrelevant compared to storage tanks.
Storage tanks, however, take 10 to 15 minutes to recover hot water after the tank is emptied.
The difference is, tankless heaters do not store water. This means there is no wait time for hot water recovery. Water is heated on-the-go, on-demand.
What's the Difference in Performance?
Instant heaters can keep producing hot water at 5 lit/min, but the flow rate does not go up higher. This is fine if you are using a special hand shower, but not ideal if you have a big, luxurious rain shower.
Tankless heaters are small and sleek, and look just like an instant heater. But don't mistake their small size for low performance. They are rated from a range of 3.5kW to 12kW. The high kW power versions can fill bathtubs.
Choosing your kW determines how good your flow rate will be. HDB and condos have limits and can only select up to 7 lit/min tankless heaters. This is good enough for a decent spray on a hand shower.
Landed homes have a higher power loading. If they plan their electrical cables early, landed home owners can get powerful tankless systems that are easy to maintain and save on space.
Storage heaters have the most powerful flow. They are designed for that glorious, full-pressure power shower effect. The downside? They only produce a limited amount of hot water before needing time to reheat.
If you need a large amount of hot water to fill a bathtub, we recommend going for a central storage heater.
How Insulation Affects Tank Heater Heat Recovery
Why can't your heater keep water hot?
Maybe it’s poorly insulated.
Ever wonder why some heaters seem to “magically” keep water hot all day, while others leave you shivering halfway through your shower? This isn't magic. It is insulation.
Good insulation is like a thermal blanket wrapped around your water. It locks in the heat, slows down heat loss, and keeps your water toasty for hours, even if your heater is off! That means less reheating, faster hot water, and lower electricity bills.
It pays to invest in a good brand.
Top-quality heaters like AOS use thicker, high-density expanding foam insulation. This stuff fills every gap, clings tight to the tank, and slows down heat escape.
Cheaper heaters often use thin, low-density styrofoam. The soft and light kind that crumbles at the touch. It is low cost, but not that great when it comes to heat retention.
If you are going to get a storage tank, invest in better insulation for hotter water, faster reheating, and more energy savings. It isn't easy because this info is not in a spec sheet, but read the reviews on whether the tank can actually retain heat.
Been using another brand of heater for over 5 years and always felt that the insulation 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.
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.
Katherine Lim
Google review
The price might be higher than the more common and popular brands but the water does remain heated longer.
I would just need to on it once in the evening and the water will remain heated for the next 24 hours or longer, depending on your usage and the tank capacity.
I like the digital control panel as well. Able to set the timer function and let it turn on and off without worries.
I would just need to on it once in the evening and the water will remain heated for the next 24 hours or longer, depending on your usage and the tank capacity.
I like the digital control panel as well. Able to set the timer function and let it turn on and off without worries.
Daniel New
Google review
What Heaters Have Fast Recovery Time?
Today’s heaters are smarter, faster, and built for real life, especially in our busy Singaporean homes.
Digital Gen 6 Storage Heaters are next level gadgets. They don't just heat, they detect when hot water is needed and actively push it straight to you. You now get up to 80% faster heating time. That is a major step up from Gen 1 models.
You will also love the full hot water visuals right on the control panel.
Digital heaters like the Generation 6 have quietly become the #1 bestsellers, and it isn't hard to see why.
They are reliable, save loads of time and are efficient enough to serve families of up to 5, even with a bathtub in the mix!
Instant and Tankless Heaters Don't Need Insulation. Yetm Recovery is Fast.
Instant and tankless heaters are heat water in a different way from tnak heaters. They don’t store hot water, and have no heat loss.
Tankless heaters on fast heating power. The higher the kW, the faster hte speed of heating. Tankless heaters heat water only when you turn on the tap.
There is no water tank, no “keeping warm” in the background, and definitely no need to store hot water for later.
Since there’s nothing being stored, there’s nothing to insulate!
No hot water sitting around = no heat loss = no insulation needed.
I personally prefer a simple hand shower... the water pressure is better and it allows me to adjust the angle easily. Big rain showers can be a bit troublesome.
Conclusion
Here is a quick summary for units popular for HDB and condo.
Tankless units have the lowest recovery time, while tank heaters take a little longer.
