How to Determine Condensate Pump Size for a High-Efficiency Furnace

High-efficiency furnaces rely on condensate pumps to function correctly. Because these units are so efficient, they create a lot of condensation while they are working. That condensation, along with assorted minerals, must leave the furnace quickly. This is where the condensate pump comes in. These small devices are designed to collect and remove water directly from a high efficiency furnace or air conditioner. They come in a wide range of sizes and horsepower, but selecting a new condensate pump can be a painless process.

Furnace manual
Bucket
Measuring tape

Instructions

- 1
  Refer to the owners manual that came with your furnace to determine the amount of condensate the furnace creates. Place a bucket under the furnace's drain and record the amount of condensate produced in an hour if you wish to be absolutely certain.
- 2
  Measure the height difference between the location of the condensate pump to the level of the outlet using a tape measure. Measure the horizontal length that the water must travel to be removed. Consider relocating the pump if this length exceeds 50 feet.
- 3
  Take the information you've gathered to your local home improvement store or HVAC specialty store. Select a pump that is designed for high efficiency furnaces and slightly exceeds your furnace's needs. Base your selection on the size of the pump's reservoir, vertical pump capability and materials. A well-made plastic condensate pump will not rust in high-humidity locations like basements. Research models online if the local stock is not satisfactory.

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