Is it required to use all CPVC after pool heater? What about polyethylene pipe underground?

mikes112

Well-known member
May 28, 2019
73
New Jersey
Is it required to use all CPVC after pool heater? What about polyethylene pipe underground? Is it based on temperature? So I guess the second Jandy valve in the bypass past the heater should be CPVC? And maybe a stupid question but why not insulate the pipe that goes from the heater too the pool as heat could be lost to the earth? I know the pool is open on top, but the earth has greater mass then the air above the pool.
 
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JoyfulNoise

TFP Expert
Platinum Supporter
May 23, 2015
17,445
Tucson, AZ
Pool Size
16000
Surface
Plaster
Chlorine
Salt Water Generator
SWG Type
Pentair Intellichlor IC-40
No, CPVC isn’t required and anything buried underground should be rigid SCH40 PVC, not polyethylene.

There were very old heaters once that had cast iron headers which required the plumber to add about a foot or so of copper piping before and after the heater to help transfer some of the heat away and protect PVC from melting. But those were old heaters. Modern heaters don’t typically require that.
 
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JamesW

TFP Expert
Mar 2, 2011
21,547
Is it required to use all CPVC after pool heater? What about polyethylene pipe underground? Is it based on temperature? So I guess the second Jandy valve in the bypass past the heater should be CPVC?
Jandy Neverlube valves are CPVC, but CPVC is not necessary.

Jandy Neverlube valves are a good choice for valves.

Ideally, the heater should shut off about 5 minutes before the pump does to dissipate any residual heat.
 
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jimmythegreek

TFP Expert
Bronze Supporter
In The Industry
Aug 10, 2017
3,077
Morris Cnty NJ
Schd40 is all that's needed todays heaters are nothing like the old ones. The earth is a great insulator all on it's own. Biggest loss is at the heater itself, they are mostly 80% efficient. 20cents of every dollar of gas spent goes in the air not the pool
 
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mikes112

Well-known member
May 28, 2019
73
New Jersey
I don't think it will matter what your pipes are if the grounds shifts around a pool
I asked because my existing pipes are polyethelyne and are flexible and are at least 10 years old and no cracks so far but new research says that chlorine can degrade them so just wondering what other people are using.
Thanks.
 

AusPhil

Well-known member
Jan 23, 2018
181
Canberra ACT
It has been recognised that residual chlorine can impact the service life of PE pipes but with service life measured around the 100yr mark it may be slightly moot point generally.
Researching this i found this pdf to read https://www.pipa.com.au/wp-content/uploads/2019/04/POP018.pdf?v=1582861953012 and noted that the pipe manufacturers in Aust at least are rating PE pipes for their chlorine resistance
 
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