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Is it ok for the furnace's condensate drain to touch the vent pipe on water heater and furnace?

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My gas furnace and water heater are side by side in the garage and there is a plastic hose from my furnace that touches both the water heater and furnace pipe.....will this cause the hose to overheat?
asked in Heating and AC by stevie70 (120 points)
edited by darekrudy
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1 Answer

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Hi Stevie,

I rephrased your question slightly (please correct me if I’m wrong). I’m assuming this is a condensate tubing from the “A” coil located above the furnace. If so and if that tubing is made out of regular PVC it should not be touching any metal vent pipes because PVC’s maximum service temperature is 140°F. If it is CPVC (you should be able to see that code along the pipe’s sidewall) the temperature is slightly higher: 200°F.

Unless you have some different, high temperature rated plastic hose installed, both of those materials (PVC and CPVC) could start melting if in contact with a hot furnace or water heater vent pipe. It would be wise to re-route the plastic line so it’s not in contact with vent pipes.

answered by darekrudy (21,730 points)
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