I am looking for a circulation pump (or three). We use geothermal to heat out 16k gallon indoor pool. I have two additional two inch lines from the pool entering and exiting the utility area, also where all the basement and main floor tubing’s shows up. My plan is to pump pool water through the tubes. Is there any specific pumps I should be looking at? It would be nice to have one that could prime itself to 2 feet, but I can prime it a different way if I need to.

And yes it does work I used a "pond" pump (2 gpm) and it brought the basement floor from 56F to 75F in 36 hours using only one of the four tubes, the pool is kept at 88F. I would just like to plumb this all in and use the right sort of pump. I was thinking the basement as one zone (four 250's runs), the main floor has two zones (four 250's) and bathrooms (two 250's).

Thanks, the chlorine in the pool is typically below 2 ppm, usually about 1 ppm. I did get the oxygen barrier pex, not sure if that matter or not, but I was told it was a better one to get. Very true about not using an iron pump, plastic sounds like the way to go. I had heard elsid? makes a good circulation pump?

So if I want to run on three pumps that would be a max of four 250 foot runs in parallel on 1/2 pex, ball park what size should I be looking at? I guess the nice thing is if it is to slow it won’t hurt anything, just not heat the floor as much?