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High efficiency & condensing heating boiler condensate drainage piping & disposal guide:

Plumbing & heating codes & suggestions for disposal of condensate produced by high efficiency gas-fueled condensing boilers & furnaces.

This article series discusses the installation, operation & maintenance as well as defect inspections for high efficiency oil and gas fired heating boilers & furnaces, condensing boilers, and similar energy-saving equipment.



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Condensate Drain Specifications for High Efficiency & Condensing Gas Heating Equipment

High efficiency heater problems (C) Daniel Friedman

Reader Question: proper piping materials for condensate from condensing furnaces or boilers

2017/01/11 Greig said:

Can a brass fitting be used to connect a condensing boiler flue condensate or will this corrode?

This question and answer were posted originally at CHIMNEY WET TIME & CORROSION

Reply: use corrosion-resistant piping for condensate disposal

Condensate from condensing boilers is quite corrosive, a view shared by experts (Xinqiao 2006). That's why plastic is a good drain material. Stainless steel might be acceptable in some situations. I'd be careful about using brass, iron, copper, galvanized pipe.

While the manufacturer of the boiler would be the an authority on what is acceptable piping material for condensate disposal, model building codes say this, using ICC model building codes adopted by Virginia in the U.S. as an example:

SECTION 314 - CONDENSATE DISPOSAL

[M] 314.1 Fuel-burning appliances. Liquid combustion byproducts of condensing appliances shall be collected and discharged to an approved plumbing fixture or disposal area in accordance with the manufacturer’s installation instructions.

Condensate piping shall be of approved corrosion-resistant material and shall not be smaller than the drain connection on the appliance.

Such piping shall maintain a minimum horizontal slope in the direction of discharge of not less than 1/8 unit vertical in 12 units horizontal (1-percent slope).

[M] 314.2.1 Condensate disposal. Condensate from all cooling coils and evaporators shall be conveyed from the drain pan outlet to an approved place of disposal.

Condensate shall not discharge into a street, alley or other areas so as to cause a nuisance.

[M] 314.2.2 Drain pipe materials and sizes. Components of the condensate disposal system shall be cast iron, galvanized steel, copper, cross-linked polyethylene, polybutylene, polyethylene, ABS, CPVC, or PVC pipe or tubing. All components shall be selected for the pressure and temperature rating of the installation.

Condensate waste and drain line size shall not be less than 3/4-inch (19 mm) internal diameter and shall not decrease in size from the drain pan connection to the place of condensate disposal.

Where the drain pipes from more than one unit are manifolded together for condensate drainage, the pipe or tubing shall be sized in accordance with an approved method.

All horizontal sections of drain piping shall be installed in uniform alignment at a uniform slope.

Research on corrosion in condensing boiler condensate systems

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