My current pump, a Hayward Super II, has been leaking for the past year & it's gotten to the point where I need to add water to pool on a weekly basis. Between that, the noise, & my electrical bill I am thinking it is time to upgrade to a variable speed pump but I have some questions that I am hoping you guys can answer for me or at least point me the right direction. But first my info:
I have a 11600 gallon in ground fiberglass pool with an attached hot tub. As I said I currently using a 2 HP Hayward Super II with a Hayward C1750 cartridge filter. I have Laars ES 400 heater for the hot tub & 4 Fafco Sunsaver ST panels on my 1 story roof for the pool. I also have a Polaris system as well. I live in Campbell, CA & run my pool year round, though I obviously run it less in the winter.
My first question is about the max speed I need for my pump. A while back I found a formula for calculating the minimum flow rate you would need to turn over your pool twice in one day. (Unfortunately I didn't save the URL & I can't find it again) And for my pool I calculated 16 gallons/min. Based on this I don't think I need a very powerful pump, say a 1/2 HP, to just turn over the water. However I don't know how to determine how much I need when you factor in the hot tub or pushing the water to the solar panels on the roof or running the Polaris or any combination? I don't want to pay for a high powered pump that I am not going to use but I also don't want to buy an under powered pump either. So how do I figure out the max pump speed I need? Do these other factors (ie, hot tub, polaris, etc) even matter?
My second question is related to the 1st in that as I understand it in some situations a dual speed pump makes more sense than a variable speed pump. What are these cases? Do I have one of them? It seems like between the pool itself, the hot tub, & the polaris I would need the variable speeds but maybe I am wrong.
And finally I have been going back & forth between a Hayward EcoStar & a Pentair IntelliFlo. Based on some of the older threads here it seems people are split 50/50 on which is better. Has there been any change since the last thread about this? Does the fact I run the pool year round make a difference either way? I assume having a Hayward filter doesn't really matter, as opposed to having say a Hayward electronic timer.
Any info or advice you would give would be most appreciated. Thank you in advance.