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Rheem Tankless Hot Water with Culligan Water Filtration

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3m type filter cartridge approved by tankless

All of your 100% filtered hot water that you can drink. 

  • The we recommend a 3M type, 5-micron filter ​cartridge with graded density that traps large particles on the surface and finer particles through the media depth for a long service life. Remember, average human red blood cell is about 5 microns.

  • This food grade quality filter is made of Polypropylene filtration media, this range of compact filters is able to enhance taste and reduce odor, chlorine, lead and controls the formation of scale.

  • Above is a cartridge comparison before and after 6 months, based on city water treatment.
  • NSF/ANSI 42 & 372 Certification by WQA against NSF/ANSI42. The filter reduces up to 99% of Chlorine, sand, rust, sediment, scale color and odor. Lead Free Certified by WQA against NSF/ANSI372.
  • The cartridge can filter up to 30,000 gallons depending on local water quality. Suggest replacing it every 6-12 months for the average household of 3 people, 3 showers. This is dependent on the city water supply quality.

The best filter cartridge is 3M type ONLY ONE APPROVED BY Tankless

Available on Amazon

PUREPLUS AP810 5 Micron 10" x 4.5" Whole House Sediment Home Water Filter Replacement Cartridge for

Compatible with WH-HD200-C 3M equivalent, 3Pack



Filter O-rings



Available on Amazon

Captain O-Ring - Culligan Compatible OR-250 (OR250) Replacement Filter Housing O-Ring Buna-N ORing (3 Pack) (Compatible with WH-HD200-C


silicon grease


Available on Amazon

DANCO Waterproof Silicone Faucet Grease | Silicone Sealant | Plumbers valve Grease for O-rings | 0.5 oz. | 1-Pack (88693)