Installing a 1.5" Pump with 2" plumbing - a mistake?

KentonR

New member
May 18, 2019
3
Lancaster, CA
Hi everyone, I am new here. We bought a home with a pool a year ago and its my first time owning a pool... we've been paying a pool guy to maintain it since we've been busy, but now it's time for me to learn about it all myself and take control!
The previous owner did not use the pool for a few years and all the equipment needs work.. the old 1HP single speed motor leaks and barely works so first thing is to get a new pump. The current pump and all pad piping is 2". The current pump is wired 115V. The issue I'm seeing is that the few 115V variable speed pumps on the market all use 1.5" in/out. I'd rather not run 230V to the pad since it's quite far from the electrical box, but am I doing myself a big disservice if I put in a 1.5" pump with the existing 2" piping? Would I see a big improvement if I go with a 2" pump? (rewire for 230V?)

It seems we don't need a large pump for our (relatively) small pool. The pad is close to the pool (about 25 ft away), no spa or other water features. I was thinking the Hayward 0.85 HP SP26115VSP pump might do the trick, except it has 1.5" in/out.
Thanks for your help. I am glad to have found this resource, I've learned a lot already reading everyone's posts, and it has given me confidence that I can learn to master my own pool and get it working / maintained correctly !!
 
You can use a smaller pump, just use reducers in the plumbing when needed.

A bigger pump will not be more efficient, it will just cost more to buy and run if you do not need the higher flow rates.
 
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A larger VSP pump should be a little bit more efficient (at the same flow rate) but more importantly, it will allow you to run at a lower RPM for the same flow rate thereby making the pump quieter. So although you don't "need" a larger pump, there are a few advantages to going with one.
 
Great thanks, this is all new to me so I’m sure I’m over thinking it!

Am I foolish to self install and essentially void the warranty. The pool guy we’ve been using wants $1600 for the pump with install... the pool store quoted similar. So buying he pump myself for $700 seems a pretty big savings and just fingers crossed the pump doesn’t fail.
 
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