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Whirlpool WHER25 3-Stage Under Sink Reverse Osmosis System review

Whirlpool WHER25 3-Stage Under Sink Reverse Osmosis System

The majority of the best-selling RO water purifiers are intended for indoor use. If you need an outdoor reverse osmosis system water purifier, Whirlpool WHER25 3-Stage model is our recommendation. It is very cheap, has a strong filtration system, and can be installed outdoors, as its materials are durable and weatherproof. Furthermore, this is one of the rare models with a convenient filter replacement indicator light feature. It saves your time and you don’t have to guess when you should replace the filters. Let’s see the full list of its features.

Key Features


This water purifier has passed several national safety tests, including the NSF/ANSI 58 standard, as well as the standard number 42. It also holds the Water Treatment Device Certificate issued by the State of California Department of Health Services. This water purifier removes different contaminants, including heavy metals, bacteria, and viruses.

Filter indicator light

The Indicator light is a very convenient feature which tells you when it’s time to replace the filters. This is one of the biggest advantages of this model over other similar models. This system helps you keep your device at maximum performance.

Durable filters

The WHEERF filter should be changed every 6 months. The WHEERM membrane must be changed once in two years. However, the indicator light will inform you on the most convenient time to do the filter replacement.


This water purifier by whirlpool saves your precious kitchen space. It can fit under the sink perfectly. This is the best choice for families, especially for those with small kitchens.


  • Has a convenient filter change indicator light
  • Elegant, white color
  • Durable
  • Suitable for the outdoor installation
  • Compact size
  • Three filter system
  • Economical
  • Easy to use
  • Long-lasting filters
  • Filters that are easy to replace
  • Quick and easy installation
  • Occupies little space
  • Excellent lead reduction
  • Good for families


  • 14-gallon capacity could be a limit for some users.

Frequently Asked Questions

What does the package of this device include?

Answer: This model comes with a high-quality water faucet, a set of filters including 1-pieceWHEERF filter and one 2-year membrane. Furthermore, the device comes with the original water storage tank, the installation fittings, as well as the tubing. The tubing is color-coded for extra-easy installation. Furthermore, the manufacturer provided the push-in connectors.

How many cleaning stages are there within this model’s system?

Answer: There are three stages of water purification. The engineers made sure that these stages are very powerful and reliable. The system removes many contaminants from water, including lead, hormones, chlorine, odors, sediment, barium, chromium, cadmium, copper, radium, selenium, nitrites, fluoride, ammonium, bromide, etc. The system efficacy equals 99%. This is especially important when it comes to lead removal.

Does this model fit under the sink?

Answer: Yes, it does. As its system is a 3-stage filtration one, it takes up less space than the 5-stage and 6-stage models.

Is it complicated to change the filters?

Answer: No, it is not complicated at all. This model actually comes with anUltraEase Technology which makes the filter changing super-easy. Furthermore, this water purifier has an EZ change indicator light that informs you when you have to change the filters.

How often do I have to change the filters?

Answer: The filters are high-quality and long-lasting. The pre and post filters should be changed every 6 months, while the membrane lasts more than 2 years. However, you can rely on the indicator lights as well.

What is the main flaw of this device?

Answer: The main flaw of this water purifier is the 14-gallon capacity. Compared to other similar devices which have from 40 to 90-gallon purified water capacity per day, this is a rather low-performance device. However, this feature has its benefits. It is perfect for a family or for those living alone. In that case, a 75-gallon device would be unnecessary. Furthermore, some users think that the 3-stage filtration is not enough to purify the water and denote this as a flaw. However, the filters are high-quality and rather strong. Therefore, the water purity level is up to 99%.


The Whirlpool WHER25 3-Stage Under Sink model is one of the best RO Water Filter systems for families, as its capacity does not go beyond 14 gallons per day. It is portable, suitable for outdoor installation and use, and very durable. Its greatest asset is the indicator light which informs you on the best time to change your filters.

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