You accept the use of cookies as described in our Privacy Policy by clicking 'OK'.
Navien PeakFlow anti-scale systems have protected Navien tankless water heaters and combi boilers from damaging lime/calcium deposits for many years. This advanced scale prevention technology is now available to protect your complete water supply system, for residential and commercial applications.
Hot water piping
Heat exchanger in tankless water heater
Hot water outlet on water heater
PeakFlow® anti-scale technology transforms potential hard scale calcium carbonite buildup to microscopic soft scale (aragonite and vaterite) that can easily be washed out with water flow and won't adhere to plumbing and appliance surfaces. Calcite, vaterite and aragonite have the same chemical composition (calcium carbonate) with different structures.
Without PeakFlow, calcium carbonate forms calcite: a very hard type of scale that builds up in heat exchangers, reducing heat transfer efficiency and blocking water flow. PeakFlow prevents harmful calcite scale buildup to maintain applicance efficiency and water flow.
Calcite scale - crystal structure
Vaterite scale - amorphous
Aragonite - crystal needles
| Monthly Utility Bill | Water Heater Portion | 30% Savings | Annual Savings |
| $100.00 | $20.00 | $6.00 | $72.00 |
| $150.00 | $30.00 | $9.00 | $108.00 |
| $200.00 | $40.00 | $12.00 | $144.00 |
| $250.00 | $50.00 | $15.00 | $180.00 |
| $300.00 | $60.00 | $18.00 | $216.00 |
Industry studies indicate that reducing scale and sediment can contribute up to a 30% increase in efficiency.
Invest in PeakFlow protection when buying a tankless water heater and enjoy:
Extend your labor warranty for an additional year when you install a new Navien tankless water heater with a new PeakFlow A or PeakFlow C scale prevention system.
A chemical-free, scale prevention water treatment system designed for residential point of use applications with flow rates up to 6 gpm
Learn more about the
PeakFlow S model
This advanced water treatment system is not only chemical-free and anti-scaling but has higher flow rates up to 10 gpm for residential or commercial, point of entry and point of use applications.
Learn more about the
PeakFlow A model
Named a 2022 Sustainable Product of the Year by Green Builder Media.
A highly recommended scale prevention system for larger residential and commercial applications up to 20 gpm. This environmentally friendly system is a “must buy” in areas of hard water and when sized correctly can help to ensure the performance and longevity of your system.
Learn more about the
PeakFlow C model
