Not all tankless water heaters require a condensate drain, as the need for one depends on the type of fuel (gas or electric) and the specific model of the tankless unit. Condensate drains are typically associated with condensing tankless water heaters, which are more energy-efficient and extract additional heat from combustion gases.
Here's a breakdown of the two types of tankless water heaters and their condensate drain requirements:
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Condensing Tankless Water Heaters (Gas):
- Condensate Drain Required: Most condensing tankless water heaters, which operate on natural gas or propane, produce condensate as a byproduct of the combustion process. This condensate is acidic and needs to be safely disposed of. Therefore, condensing tankless units usually require a condensate drain for this purpose.
- Installation: The condensate drain line should be installed according to the manufacturer's guidelines to ensure proper disposal of the condensate.
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Non-Condensing Tankless Water Heaters (Gas or Electric):
- Condensate Drain Not Required: Non-condensing tankless water heaters, whether gas or electric, do not produce condensate as part of their operation. Therefore, they typically do not require a condensate drain.
It's important to check the specific model and manufacturer's documentation for your tankless water heater to determine whether a condensate drain is necessary. If your unit does require a condensate drain, it's essential to follow the manufacturer's installation instructions carefully to ensure the safe and proper disposal of condensate.
Additionally, local building codes and regulations may dictate specific requirements for condensate drains, so it's advisable to consult with a licensed HVAC professional or plumber who is familiar with local codes when installing or servicing a tankless water heater.