Whirlpool WHER25 RO Water Filtration System Review

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    Whirlpool WHER25 RO Under Sink Water Filtration System

    Whirlpool WHER25 RO System

    •    Price: $
    •    Filter Stages: 3
    •    Gallons per Day: 18
    •    NSF Standard: 42, 58
    •    Annual Costs: ~$175.00
    •    Warranty: 1 Year

    In this review, we are going to take a thorough look at the Whirlpool WHER25 reverse osmosis water filter system.

    Now, obviously most of us associate Whirlpool with all different kinds of home appliances, from top-load washers and dryers to refrigerators and microwaves. But how well does the company score when it comes to water treatment? We are about to find out!

    The WHER25 uses 4 (actually it’s only 3) stages of filtration tested and certified against NSF standards 42 and 58 to deliver bottled water quality right at your kitchen sink.

    • Stage 1: A sediment pre-filter reduces sand, dirt and other larger particles as well as an average of 95.2% chlorine taste and odor. This improves the looks, taste and smell of your water. And more importantly, it protects the system’s delicate RO membrane from clogging and thereby extends its working life, which in turn saves you money.
    • Stage 2: The semipermeable RO membrane separates water from dissolved solids and organic matter. Some reduction rates are: Lead (99.1%)*, arsenic (98.2%)*, cysts (99.99%)*, nitrate plus nitrite (75.4%)*, chromium 6 (97.0%)*. *tested by NSF International
    • Stage 3: An activated carbon post-filter ensures that your water is fresh at all times by removing any remaining tastes and odors.

    The recommended pressure at which this system can operate is 40-100 psi. If the water pressure in your home is too low, filtration might be inefficient and slow.

    System Installation

    The WHER25 was designed to be easy to install and maintain without the need for a plumber and without having to struggle with ongoing leaks. The RO system comes with illustrated DIY instructions.

    Usually, we would provide you with an installation video at this point, but unfortunately there is none.

    Parts List

    • RO module
    • 2x filters
    • RO membrane
    • Feed water adapter
    • Drain saddle
    • Water storage tank (white)
    • Tank connector
    • Coin battery
    • Faucet
    • Color-coded tubing
    • Nitrate/nitrite test kit
    • Eye dropper

    Filter/Membrane Replacements

    Like we said, this system was designed to allow for easy maintenance. You can change filters in seconds – literally. Just give them a quarter-turn, remove and replace. No need to turn off the water supply, no spilling, no leaks, no worries.

    The built-in filter change indicator is supposed to let you know when filters need replacement. However, our guess is that the indicator measures time instead of actual TDS, so don’t put too much faith in it.

    According to Whirlpool, this is how often you will have to change each component in order to keep up the filtration performance and guarantee high quality drinking water for your family:

    • Sediment pre-filter: About every 6 months
    • RO membrane: Every 2 years
    • Activated carbon post-filter: About every 6 months

    As always, replacement frequencies are highly dependent on your water usage and source water quality. So you might have to change the filters less/more often.

    Replacement costs? About $175 per year, which is on the expensive side, especially when we take into account the fact that we only have 1 pre-filter, 1 post-filter and 1 RO membrane.

    Whirlpool WHER25

    What We Don’t Like

    Here is what we don’t like:

    • In the user manual it says that one has to open the RO faucet and let the water run for 24 hours to purge the system after each filter replacement. Although “water flow will be a slow trickle at this time“, to us this seems like a huge waste.
    • Customers have complained about missing parts that delayed the installation.
    • Others have mentioned system parts that started leaking all of a sudden.
    • The system’s filtration capacity is 18 gpd at max, which is a lot less than what we get with most other models.
    • Whirlpool’s customer service is not always helpful.
    • The filters and membrane tend to wear out faster than specified.

    Our Verdict

    On the one hand, the Whirlpool WHER25 is one of the few reasonably priced RO filter systems made in the USA. Water quality is good and, what’s more, maintenance requirements are low.

    On the other hand, we have a low filtration capacity and filters that need to be flushed for a full day prior to use and tend to wear out fast. On top of that, installing this system is like gambling – you never know if it’s going to flood your house while you are sleeping.

    Our verdict: 2.0 out of 5 stars and no buying recommendation!

    Looking for More Product Reviews?

    If you are looking for more detailed RO system reviews, you can find our Top 10 list right here!

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    And in case you have any questions about the Whirlpool WHER25 or any other filter system really, please don’t hesitate to leave a comment below!

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