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International / National Standard Plumbing Code: Neutralize the Condensate

Wednesday, September 27, 2023 2:37 PM | Anonymous

If you are a plumber or a trade professional who actively promotes the use of high-efficiency, condensing water heaters, boilers or furnaces, you should be equally energetic in treating discharge coming from this equipment with some sort of neutralization. That’s the only way to protect your customers’ plumbing from the potentially harmful side effects of the condensation process. As the popularity of high-efficiency condensing products grows, so too will the problem of acidic condensate.

As a matter of fact, International Plumbing Codes and National Standard Plumbing Codes  require neutralization for corrosive waste. To elaborate: IPC and NSPC state that corrosive liquids, spent acids or other harmful chemicals that destroy or injure drain, sewer, soil or waste pipe, or create noxious or toxic fumes, or interfere with sewage-treatment processes shall not be discharged into the plumbing system without being thoroughly diluted, neutralized or treated by passing through an approved dilution or neutralizing device.

Which states use IPC and NSPC codes?

The NSPC is designed to ensure the proper installation of plumbing systems, providing local and state governments, code administration bodies, and the industry with a modern code to protect health and promote safety. New Jersey uses the National Standard Plumbing Code.

The International Plumbing Code is a proven, comprehensive model plumbing code that works seamlessly with ICC's family of building codes. It sets minimum regulations for plumbing systems and components to protect life, health and safety of building occupants and the public. The IPC is available for adoption by jurisdictions ranging from states to towns, and is currently adopted on the state or local level in 35 states in the United States, the District of Columbia, Guam and Puerto Rico.

What is the best way to neutralize? Why is it important?

Condensing technology saves energy by maximizing the amount of heat energy transferred to the water during the combustion process. A byproduct of this process is water, or condensate, that tends to be acidic because of the chemical reaction caused by the heat of the gas burner. Indeed, the higher the efficiency rating, the higher the acid level in the water runoff.

If this runoff is disposed of through a home’s or a building’s plumbing system, the piping could corrode, rust over time, and cause serious damage to local sewers and water treatment facilities. Pumping the waste outdoors or into sanitary sewers could contaminate the groundwater or degrade the local water infrastructure. For homes with septic tanks, condensate waste might also destroy the good bacteria that is essential to keeping the system operating properly.

The higher, front-end costs of high-efficiency equipment are typically justified by lower energy consumption and the resulting lower monthly fuel bills. But those savings could be wiped out and then some if the plumber must return in just a few years to tear out and redo all the plumbing.

The smart, long-term solution is to neutralize the acidic content in the condensate waste before it ever enters any piping.

Although International Plumbing Codes require condensate waste-neutralization, enforcement is spotty. Some sections of the country, such as New England, strictly enforce the code requirements; others — including the Far West — tend to be lax.

Even so, the trades must become more aware of this problem because the acid in the condensate will just eat away the piping.

Neutralization can be accomplished in several ways:

  1. Manually, by cutting a bed of limestone into the floor where the condensing water heater, boiler, etc., is located, and letting the condensate drip into it.
  2. Positioning a limestone-filled cartridge inside of the condensing unit to neutralize the water internally.
  3. Hooking a neutralization kit — essentially, a piece of pipe filled with limestone — to the exterior of the condensing equipment and letting the condensate flow through it.

Saniflo manufactures a neutralizing component that falls into the third category, but with a more sophisticated approach. The Sanicondens Best Flat couples a pump with a neutralizer to move condensate from the water heater or boiler through limestone granules in a tray before pumping the water into the sewer or septic system.

The pump ensures condensate waste does not linger inside or around the water heater or boiler, while the neutralizer removes the acidity that would damage water and sewer pipes.

How does Saniflo’s condensate pump work?

The Sanicondens Best Flat is capable of serving multiple mechanical systems — up to a combined total of 500,000 Btu per hour.

The pump has an easy to refill pH-neutralizing pellet tray. Making it the ideal single, space-saving, environmentally friendly solution for today’s ultra-high-efficiency condensing equipment, both residential and commercial: boilers, water heaters, air-conditioning and refrigeration systems, and other appliances.

Often, condensate cannot drain adequately via gravity, usually because the application lacks conventional, below-floor drainage. This problem can cause property damage or even create health hazards by adversely affecting indoor air quality.

But the Sanicondens Best Flat is a sleek, lower-profile condensate pump using a built-in neutralizer to boost the pH of the acidic condensate before it can be discharged into a drainline — thus preventing corrosion.

Its streamlined design handles up to a combined total of 500,000 Btu per hour and incorporates two 1-inch inlets: one on the side and the other on the top near the neutralizer tray.

Condensate entering the system automatically activates a float mechanism that, in turn, starts the motor whose spindle/shaft drives the impeller. The condensate is neutralized as it comes into contact with the neutralizer pellets in the tray before being pumped safely away through a 3/8-inch discharge line into the sanitary sewer or a septic tank.

Enforcement of the condensate-neutralization codes will likely increase as the problem — and its potential toll on plumbing systems — become more widely recognized. But if you are a plumber who installs condensing equipment, you should not wait, if only for the sake of your customers. According to, high-efficiency condensing boilers, HVAC systems and water heaters will cut homeowner fuel costs dramatically. But to achieve maximum value — and to ensure the customer’s money-saving investment doesn’t cause problems that cost thousands of dollars more down the road — it is vitally important to neutralize the condensate waste such units emit.

If you have any questions or concerns, you can always call the Saniflo technical hotline at 800-571-8191 to find out which products would work best. Or you can send an email to with details on your installation.

PHONE / FAX: 941-977-5077

8283 Vico Court
Sarasota, Fl. 34240 

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