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Tankless Water Heater Maintenance

A tankless water heater delivers hot water on demand, but hard water minerals do not stop building up just because there is no tank. Calcium and magnesium deposits collect inside the heat exchanger every time water passes through, gradually restricting flow and forcing the unit to work harder. Left unaddressed, this scale buildup raises energy costs and can shorten the lifespan of the unit significantly.

Chromex offers complete flush kits and descaling solutions designed specifically for tankless systems, compatible with all major brands including Rinnai, Navien, Noritz, Rheem, Takagi, and EcoSmart. Most manufacturers recommend a full flush once a year, or every six months in hard water regions such as Texas, Arizona, and California, to maintain warranty coverage and keep the unit running efficiently.

Not sure how often to flush, or which kit fits your setup? Visit the Tankless Water Heater Maintenance FAQ for step-by-step guidance, or read our Powered Anode Rod guide to understand the full picture of water heater protection, tank and tankless alike.

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Chromex tankless water heater flush kit with bucket pump braided hoses descaling solution and service log

Tankless Water Heater Flush Kit – 1 Qt Descaling Solution | 4.8★ Best Seller

Chromex Tools
$0.00 - $0.00
$0.00
$139.99
$139.99 - $139.99
$139.99
In stock

With a 4.8-star rating from verified buyers, this is the tankless water heater flush kit that thousands of homeowners and contractors return to sea...

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$0.00 - $0.00
$0.00
$139.99
$139.99 - $139.99
$139.99
Chromex tankless water heater flush kit with bucket pump right angle hoses descaling solution and grate

Tankless Water Heater Flush Kit – 1 Qt Descaling Solution & Right Angle Hoses

Chromex Tools
$0.00 - $0.00
$0.00
$139.99
$139.99 - $139.99
$139.99
In stock

When your tankless water heater is tucked into a tight mechanical room, utility closet, or awkward corner, standard straight hoses often will not c...

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$0.00
$139.99
$139.99 - $139.99
$139.99
Chromex heavy duty tankless water heater flush kit with bucket pump hoses and 1 gallon descaling solution

Tankless Water Heater Flush Kit – 1 Gallon Descaling Solution | Heavy-Duty

Chromex Tools
$0.00 - $0.00
$0.00
$154.99
$154.99 - $154.99
$154.99
In stock

For heavy scale buildup, hard water regions, or back-to-back professional jobs, a single quart of descaling solution is not enough. This heavy-duty...

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$0.00 - $0.00
$0.00
$154.99
$154.99 - $154.99
$154.99
Chromex tankless water heater flush kit use your own solution DIY

Tankless Water Heater Flush Kit – Use Your Own Solution (DIY)

Chromex Tools
$0.00 - $0.00
$0.00
$124.99
$124.99 - $124.99
$124.99
In stock

The most flexible tankless water heater flush kit available — bring your own vinegar or preferred descaling solution and get the job done with prof...

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$0.00 - $0.00
$0.00
$124.99
$124.99 - $124.99
$124.99
Chromex tankless water heater descaler kit with bucket pump hoses descaler and service log tag
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Tankless Water Heater Flush Kit – Biodegradable Descaler Solution

Chromex Tools
$0.00 - $0.00
$0.00
$134.99
$134.99 - $134.99
$134.99
Out of stock

More effective than vinegar and safer than harsh chemical descalers — this tankless water heater flush kit pairs a powerful biodegradable powder de...

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$0.00 - $0.00
$0.00
$134.99
$134.99 - $134.99
$134.99
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Chromex tankless water heater flush kit with bucket pump hoses and descaling solution
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Tankless Water Heater Flush Kit – 1 Qt Solution, 1/6HP Heavy Duty Pump & 25 ft Pump

Chromex Tools
$0.00 - $0.00
$0.00
$149.99
$149.99 - $149.99
$149.99
Out of stock

The most complete tankless water heater flush kit on the market. Everything you need arrives in a single box, including a pump with a 25-foot power...

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$0.00
$149.99
$149.99 - $149.99
$149.99
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Chromex tankless water heater flush kit with 1 gallon concentrated vinegar solution and 6 gallon bucket

Tankless Water Heater Flush Kit – 1 Gallon Concentrated Vinegar Solution

Chromex Tools
$0.00 - $0.00
$0.00
$149.99
$149.99 - $149.99
$149.99
In stock

Rinnai, Noritz, and other leading tankless water heater manufacturers specifically recommend vinegar-based descaling solutions — and this is the ta...

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$0.00 - $0.00
$0.00
$149.99
$149.99 - $149.99
$149.99
Chromex tankless water heater descaling solution 32 fl oz quart NSF certified blue bottle

Chromex Tankless Water Heater Descaling Solution | Highly Effective Descaler Restores Heating Efficiency, Quart, 32 fl oz (1)

Chromex Tools
$0.00 - $0.00
$0.00
$26.59 - $123.47
$26.59 - $123.47
$26.59
In stock

Hard water scale is silently destroying your tankless water heater. Chromex descaling solution dissolves it fast. Mineral deposits, including calci...

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$0.00 - $0.00
$0.00
$26.59 - $123.47
$26.59 - $123.47
$26.59
Chromex tankless water heater descaler 1 gallon 128 fl oz NSF certified restores heating efficiency

Chromex Tankless Water Heater Descaling Solution | Highly Effective Descaler, 1 gallon, 128 fl oz

Chromex Tools
$0.00 - $0.00
$0.00
$54.14
$54.14 - $54.14
$54.14
In stock

Chromex 128 fl oz highly effective descaling solution helps maintain and extend the lifespan of your tankless water heater. Dissolves inorganic mi...

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$0.00 - $0.00
$0.00
$54.14
$54.14 - $54.14
$54.14
Chromex tankless water heater descaler 4 pack 1 gallon bottles 128 fl oz NSF certified

Chromex Tankless Water Heater Descaling Solution | Highly Effective Descaler, 1 Gallon, 128 fl oz, 4 Pack

Chromex Tools
$0.00 - $0.00
$0.00
$169.99
$169.99 - $169.99
$169.99
In stock

Pack of 4, 128 fl oz each. Chromex highly effective descaling solution helps maintain and extend the lifespan of your tankless water heater.. Disso...

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$0.00 - $0.00
$0.00
$169.99
$169.99 - $169.99
$169.99
Chromex tankless water heater descaler 1.2 lb biodegradable restores circulation and dissolves scale
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Chromex Tankless Water Heater Biodegradable Descaler

Chromex Tools
$0.00 - $0.00
$0.00
$28.49
$28.49 - $28.49
$28.49
Out of stock

To ensure that a water heater continues to work at an optimum level, it is necessary to descale the appliance. This will mean removing the deposits...

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$0.00 - $0.00
$0.00
$28.49
$28.49 - $28.49
$28.49
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Chromex tankless water heater descaler 2.5 gallon 320 fl oz restores heating efficiency

Chromex Tankless Water Heater Descaling Solution | Highly Effective Descaler Restores Heating Efficiency, 2.5 Gallon Bottle

Chromex Tools
$0.00 - $0.00
$0.00
$79.99
$79.99 - $79.99
$79.99
In stock

Hard water scale is silently destroying your tankless water heater. Chromex descaling solution dissolves it fast. Mineral deposits, including calci...

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$0.00 - $0.00
$0.00
$79.99
$79.99 - $79.99
$79.99
Chromex tankless water heater descaling solution available in 1 gallon and 2.5 gallon sizes

Chromex Tankless Water Heater Descaling Solution | Highly Effective Descaler Restores Heating Efficiency, Quart, 5 Gallons (2 x 2.5 Gallons)

Chromex Tools
$0.00 - $0.00
$0.00
$149.99
$149.99 - $149.99
$149.99
In stock

Hard water scale is silently destroying your tankless water heater. Chromex descaling solution dissolves it fast. Mineral deposits, including calci...

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$0.00 - $0.00
$0.00
$149.99
$149.99 - $149.99
$149.99
Chromex 1/6 HP submersible utility pump for tankless water heater flushing

1/6 HP Submersible Utility Pump

Chromex Tools
$0.00 - $0.00
$0.00
$64.59
$64.59 - $64.59
$64.59
In stock

Corrosion-resistant, reinforced thermoplastic construction prevents rust. Removes water down to 1/4'' of surface. Permanent split capacitor motor ...

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$0.00 - $0.00
$0.00
$64.59
$64.59 - $64.59
$64.59

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