A. O. Smith Water Heater Pre-filter prevents impurities and sediments from entering your heater tank. 

Flush out sediments before they reach your water heater so that water in your tank stays clean longer.

If you live close to the sea or stay-cationed in an island resort, you may have on occasion, noticed fine sand particles while soaking in your bathtub. A pre-filter helps to clear out the water before your tub is filled. 






Why Choose Our Product



  • Features

    Prolongs life of water heater

    Once sediments settle in your tank, corrosion begins and the enamel of the internal tank weakens. Pre filters prevent sediments from entering in the first place.


    100% fully-owned robotic plants


    To maintain high quality control, A. O. Smith Corporation fully owns every of their 21 plants worldwide. They are the only manufacturer with the technology to employ robotics over 95% of their production line.


    High precision, food-grade stainless steel filter mesh

    Filter mesh removes large (>100µm) impurities, sediments and rust effectively. Water quality sees an overall improvement and this extends the service life of water-related appliances.


    Easy, Fuss-free Maintenance

    Twist to flush out for 30 seconds.

ModelAOS PF-B1
Dimensions435mm (L) x 186mm (W)
Rated pressure0.15 ~ 1.6 MPa (20-230 psi)
Rated temperature5 ~ 40°C
Inlet/outlet diameterDN25
Flow directionIndirect
Stainless steel filter mesh opening90µm
Cold water flow rate60 lit/min
Rated total water volume
Recommended time between flush2 months

Easy, Fuss-Free Maintenance Instructions

pre filter



Step 1: Hold a medium sized pail beneath the filter (Ø20cm)


Step 2: Twist a lever at the base of the filter to flush out sediments for 30 seconds.


Step 3: Sediments collected in the water are not toxic. You may recycle the water.


Step 4: The filter is cleared. There is no need to purchase a new filter or to engage a specialist to replace any parts.


Frequently Asked Questions

Where can I install my pre filter?

Install the filter on any horizontal pipe before the water heater. Clearance from floor to the bottom of filter should be at least 40cm for easy maintenance.

How do I flush my pre filter?

It is easy to flush a pre filter. There are no service packages involved and you can easily flush the filter on your own with a twist valve.

How often should I flush my filter? 

As the casing is clear, you may flush the filter once you see sediments collect in it. Most homeowners in Singapore flush out sediments from their pre filter once every three months.

Tip: place pail below the filter when flushing. You may use the flushed water for washing the floor or watering plants.

Are there any parts that require maintenance?

Unlike foam filters, the stainless steel filter mesh does not need to be changed. It can last several years.

Incoming water pressure flushes out sediments and clears the mesh. You may require a filter scrub every 3 years to remove stubborn particles that have lodged in the mesh.

Will pre filters affect my water pressure?

The pre filter can be installed in residences without reducing the water pressure at all.