Polypropylene pipe for heater exhaust

[ek1]

I have a Hayward H250FDN heater (natural gas powered) installed under the deck of my aboveground pool. I have been using a 4" flexible aluminum duct (approx. 20FT long) to route the heater exhaust to another location. The pool is located on the ocean shore and the aluminum duct becomes brittle/corroded by sea water spray every year. I am trying to avoid investing $200+ into a stainless steel rigid pipe system with elbows, supports, etc. My buddy has access to free 4" Polypropylene pipe that is rated up to 230°F / 110°C. I am trying to determine if it's safe to use for heater venting.

Does anyone know the max temperature of the heater exhaust gas?

 

[AK-]

Probably somewhere in the vicinity of 350F or more.

 

[JoyfulNoise]

Polypropylene is not designed for hot exhaust gas. The exhaust temperature can be anywhere from 280-340F right out of the heater. It will melt or, worse, catch fire.

 

[wireform]

You can use galvanized venting pipe for the fist x amount and then possibly converting to polypropylene but then again not sure if that's safe either

 

[JamesW]

I have a Hayward H250FDN heater (natural gas powered) installed under the deck of my aboveground pool. I have been using a 4" flexible aluminum duct (approx. 20FT long) to route the heater exhaust to another location.

You should hire a professional.

It's not safe to just jerry rig a heater exhaust for a gas fired pool heater.

 

[ek1]

You should hire a professional.

It's not safe to just jerry rig a heater exhaust for a gas fired pool heater.

I would not say the current exhaust was jerry rigged. It was installed by a plumber and the aluminum duct had a very high temp rating. The problem is - it disintegrated over time due to salt in the air, so I am trying to replace it with something more lasting.