Quote Originally Posted by CarlD View Post
I'm not sure about the 1.5 to 2" connections, but I do wonder why you don't go 1.5" all the way.

There are special glues formulated to handle CPVC heat, and I believe they can be used for PVC as well. But I'd be leery of using PVC on CPVC where there's heat.
Well, considering the pool is 70 feet away from the equipment pad I am trying to limit head loss. Since I am doing the installation, I figure 2" is the way to go, since the price is negligible compared to 1.5".

Also, since the filter is 2" connections, the heater is 2" connections, it just kinda makes sense to keep things 2" all around as much as possible.

I have hard that a single 1.5" fitting isn't as big of a deal as all 1.5" pipe, thus my query. I figure if folks have been doing this a while, someone would probably know if there are any issues one way or another.

In regards to the CPVC to PVC connection, I will probably just use the CPVC cement to connect the nipples to the elbow and use a threaded connection to connect the opposite side of the elbow to the regular PVC piping then. I know the instructions for the heater state to use the CPVC nipples to connect to regular PVC piping, in which case they expect a glued connection. No big deal and I would rather be safe about it and I know the "preferred" method of CPVC to PVC transition is via male/female connections, so I will just go that route.