Whirlpool WHER25 Reverse Osmosis System [3-Stage]

If your water usage is not that high or you are living alone but still want to ensure your drinking water is properly purified, then the Whirlpool WHER25 will most probably be a perfect choice for you. It’s a really affordable unit, but still quite efficient at cleaning the water.

Despite being a 3-stage filtration system, this reverse osmosis system performs really well. It has the mandatory three filters needed to remove numerous unhealthy contaminants such as chemicals, sediments, arsenic, lead, dissolved solids, chlorine odor and taste and many more.  

It offers very decent performance for a unit of its size and price. It will definitely deliver pure, fresh water. You will not get large quantities of water from this unit either, but if your water demand is on the lower side, then you have nothing much to worry about.

The unit can produce around 14 gallons a day which is just enough to cater to the daily drinking and cooking needs of a family of 4. However, in comparison to its water wastage ratio which is 3 gallons of wastewater for one gallon of pure water, this Whirlpool isn’t that efficient when it comes to water wastage.

You can easily change the filters without any hassles or mess. No need of opening anything, it just needs a quarter turn and you have access to the cartridges for replacement.

The pre and post-filters need to be changed every 6 months while the membrane should be changed every 2 years. That’s a pretty decent life span for such an affordable unit. Plus it comes with a built-in filter change indicator that will prompt you when the filters need replacement.

The Whirlpool WHER25 comes ready for installation with a DIY instruction manual to guide you through the whole process. The manufacturer also provides lifetime technical support, so should you have any difficulties while setting it up, you can seek their assistance.

Generally, this Whirlpool model is not a heavy-duty system, but for the price, it’s a fair budget solution. It will most probably meet the needs of any small family out there.


  • Convenient and efficient for a small family
  • Long-lasting RO membrane
  • An indicator to prompt you when the filter needs replacement
  • Easy to set up and maintain
  • Very affordable price


  • You may need to get additional filters like remineralization filter
  • Not ideal for more than 4 people
  • Water wastage is a bit high with regards to the flow rate

Product Overview

ProductWhirlpool WHER25 Reverse Osmosis System [3-Stage]
Rating4.1 out of 5 stars (4.1 / 5) (More than 218 reviews)
Recommended price163.23 USD (Check the latest price at Amazon.com)

Product Specifications

RO membraneN.A
Incoming Water Pressure40 – 100 PSI
TDSAbout 40 PPM
Storage tank3-gallon capacity
2-gallon holding
FaucetLead-Free Chrome Faucet
Fitting adaptorsN/A
Filtered Water to Waste Water RatioN/A
FeaturedNSF Tested and Certified
DocumentsUser Manual [PDF]


Installation Guide

This video shows you step-to-step how to install Whirlpool WHER25 Under Sink Reverse Osmosis System.

Images Gallery

Whirlpool WHER25 Reverse Osmosis System

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Whirlpool WHER25 Reverse Osmosis System installed in a cabinet
Whirlpool WHER25 Reverse Osmosis System installed in a cabinet
Whirlpool WHER25 - dimension
Whirlpool WHER25 – dimension
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Whirlpool WHER25 – Replacement filters

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