[Birdman]

Quote: Originally Posted by Rich L Much better, But still, the sweet spot would work out to about 3000 GPH. My experience is with much larger pumps but I am used to seeing the BEP just before the knee, about 4200 GPH. Looks good. You have a couple of them running at full flow (almost zero head) Did you check them for heat back when the weather was warmer? I don't expect you would measure the temperature but did they feel hot?

I have 7 of them running here, 4-3500s, 2-5500s, and 1-8500. All of them are inside building that are kept warm from all the water being heated. All of them are running at a 0 head configuration except the 8500 which is pumping 5 to 6 feet up to the top of my shower. I have felt them all at several times, this is something I just normaly do when servicing my filters, and have not noticed any other than normal heat.
Last summer before I had the filter house built they were out in the full sun here in the desert and I don't remember any heat then, but I wasn't paying much attention to that other than to make sure they weren't running to hot.