Skip to content
Mountain Water Co.
A Mountain Water Co. tankless reverse osmosis unit with its dedicated faucet

Drinking Water Systems

Tankless Reverse Osmosis

Drinking water from its own kitchen faucet, with no storage tank.

Reverse osmosis takes out what a whole-home system is not designed to catch. The tankless build does it without the bulky pressure tank, so it fits in a cupboard that is already full.

Best for: Drinking and cooking water, where cupboard room is tight

What you get

Features

  • Dedicated faucet at the sink
  • No storage tank under the cupboard
  • Choice of faucet finish

Full specifications

Reverse osmosisNSF/ANSI 58Dedicated faucet includedFive faucet finishes

Key specifications

TypeTankless, under-sink
Filtration stages7
Production800 GPD, made on demand
Flow rate0.53 GPM
Filtration precision0.0001 micron
Waste ratio2:1
RemineralizationBuilt-in alkaline stage
FaucetDedicated, five finishes
Cabinet spaceNo storage tank
Filter changesQuick-connect cartridges, DIY
MonitoringFaucet-mounted monitor
Pairs withAny whole-home system, or on its own

Installation, upkeep & warranty

What is fittedDedicated faucet, drain saddle, cold-water tie-in
LocationUnder the kitchen sink, or wherever the drinking tap goes
UpkeepOwner-replaceable quick-connect cartridges
CertificationNSF/ANSI 58
RO system warranty1 year
Labor warranty1 year from date of purchase

What reverse osmosis removes

  • Arsenic
  • Nitrate and nitrite
  • Fluoride
  • Lead and heavy metals
  • Uranium and chromium-6
  • Chlorine and disinfection byproducts
  • Sediment and dissolved solids
  • Mineral taste and odor

Warranty on this system

1 year
The RO system
1 year
Installation labor
5 years
Media and filter stages
Full warranty terms and exclusions →

Specifications from the manufacturer’s documentation. Component brands and certifications are those of their respective manufacturers.

Are you on city water or a well?

We use your details only to contact you about your water. We never sell them. See our privacy policy.

Color matched

Pick a faucet that matches your kitchen

The drinking water faucet is the only part of this system you actually see, so it comes in five finishes. Tell us which one when you call or fill out the form.

Brushed nickel drinking water faucet
Brushed nickel
Chrome drinking water faucet
Chrome
Brushed gold drinking water faucet
Brushed gold
Matte black drinking water faucet
Matte black
Oil-rubbed bronze drinking water faucet
Oil-rubbed bronze

Also in drinking water systems

A multi-stage reverse osmosis system with its pressure tank

Reverse Osmosis with Storage Tank

The classic under-sink reverse osmosis build.

View details →

System info and pricing

Find the right water system

Call or fill out the form and tell us what you're seeing — scale, stains, a smell, city water or a well. We'll tell you which system fits your home and what it costs. There's no system that fits every house, and sometimes the answer is that you don't need one.

  • Call or fill out the form
  • City water or private well
  • Monongalia, Marion & Harrison