Included with Every System
This Is Why We Filter All the Hot Water
Every Best Tankless USA system includes a WF365/3M 5-micron whole-house filtration system — protecting your family, your plumbing, and your investment for 20 years.
Why It Matters
Why our WF365/3M 5-Micron Water Filtration better than R.O.
Water filtration is critical to extending the life of our Rheem tankless system. The build-up of hard water on tubs, showers, sinks, and faucets is only part of the problem.
Over time, the minerals in hard water also start to build up inside pipes, fixtures, and appliances. The build-up we don't see can cause all sorts of plumbing problems — reduced water flow, clogs, and increased stress on pipes and fixtures. Mineral deposits also cause appliances to operate less efficiently and wear down faster.
A 50-gallon water heater has to heat all of the mineral scale buildup inside the tank, creating a toxic soup that you are exposed to every day — in the shower, washing dishes, and washing your hands.
Our WF365/3M water filtration system eliminates hard water and the toxic soup, leaving you with clean, drinkable hot water and increasing system life to 20 years.
Rheem RTGH-95DVLN-3
The Rheem tankless unit is made entirely of copper — which is why clean, filtered water is essential to protecting the heat exchanger and achieving a full 20-year system life.
Impurities Eliminated
Here Are Just Some of the Items That Will Be Eliminated:
10 U.S. States with Worst Tap Water — 2024
Maintenance
When Should You Change the Filter Cartridge?
When is it time to change a 3M type AP810 Filter Cartridge? Unlike carbon-based filters, there is no fixed replacement schedule. Watch for these three signals:
Every 12 Months or Less
Replace at least annually, or sooner depending on your city's water quality. Unlike carbon-based filters, there is no fixed schedule — monitor the signs below.
Drop in Water Pressure
If you notice reduced flow from faucets and showers, the cartridge is likely clogged with sediment and needs replacing.
Cartridge Color Has Darkened
A dark, discolored cartridge is a clear visual indicator that it has reached capacity and must be swapped out.
Tank water heaters are bad — and tankless water heaters installed incorrectly are bad.
We Offer a Filter Cartridge Change Service
$149 — includes the new cartridge and professional installation. One call and it's done.
System Overview
5-Micron Whole-House Filtration
Our WF365/3M AP810 cartridge filters particles down to 5 microns — capturing sediment, scale, and contaminants before they ever reach your tankless unit, your pipes, or your family.
01
Cold Water Inlet Filtration
The filter is installed on the cold water inlet side of the tankless unit — every drop of water is cleaned before it enters the system.
02
Sediment & Scale Removal
The 5-micron AP810 cartridge captures mineral scale, sediment, and particulates that would otherwise coat the copper heat exchanger and reduce efficiency.
03
One Cartridge Change Per Year
Only one filter cartridge change per year is required — a simple, low-cost maintenance step that protects a 20-year system.
Ready for Clean Hot Water?
Get a Free Home Evaluation
Our team will assess your home and provide an exact fixed-price quote — including the WF365/3M filtration system at no extra cost.