janderson13
New Member
Hello,
I'm finishing my basement and I would like to pre-install some 4" ABS or PVC for a condensing tankless water heater to be used with my radiant floor. I was thinking of a Takagi or Rheem unit. Anyway, the Rheem manual says that the slope for a horizontal ABS/PVC vent should be to the outside of the building (opposite of a furnace which slopes back toward the unit). I'm guessing Rheem says this because they don't have a condenstate drain on their equipment? The Takagi manual doesn't mention slope but it definetely has a drain on the unit. I'm concerned because where my vent exits my house I have to go veritical for about 1 foot before existing. Attached is a diagram.
So... I'm wondering do all tankless condensing water heater vent pipes slop to the outside normally? If so, when you have a situation like mine you don't worry about much condensation collecting in the elbow because realistically there is almost no condensation? I'm guessing condenstation really isn't a problem for this reason: if you followed the Rheem manual and slope directly to the outside any condentation would drain out the side of your house and you would have acid water running down your siding?
Any help greatly appreciated!!!!!
Thanks!
Jeff
I'm finishing my basement and I would like to pre-install some 4" ABS or PVC for a condensing tankless water heater to be used with my radiant floor. I was thinking of a Takagi or Rheem unit. Anyway, the Rheem manual says that the slope for a horizontal ABS/PVC vent should be to the outside of the building (opposite of a furnace which slopes back toward the unit). I'm guessing Rheem says this because they don't have a condenstate drain on their equipment? The Takagi manual doesn't mention slope but it definetely has a drain on the unit. I'm concerned because where my vent exits my house I have to go veritical for about 1 foot before existing. Attached is a diagram.
So... I'm wondering do all tankless condensing water heater vent pipes slop to the outside normally? If so, when you have a situation like mine you don't worry about much condensation collecting in the elbow because realistically there is almost no condensation? I'm guessing condenstation really isn't a problem for this reason: if you followed the Rheem manual and slope directly to the outside any condentation would drain out the side of your house and you would have acid water running down your siding?
Any help greatly appreciated!!!!!
Thanks!
Jeff
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