Hi looking at purchasing A5L which is a 2 person tub with only 1 pump. There is an option for $750 to add circ pump. Is it necessary? Is it that much more efficient than main pump on low? Thoughts?
Well, since there seems to be alot of confusion, let me clear it up. The bulk of the savings comes in at fill up. Depending on the volume and temp of the fill water, you can spend a long time running that low speed pump at around 4 amps or that circ pump at 3/4 of an amp. And that 10-12 hours of non-stop running is hard on a jet pump and will result in increased part replacement long term. And having 24/7 low flow filtering can decrease the length of your filter cycles, saving yet more energy and wear. But we are talking about a few dollars a month here, and the "savings" will never pay for the upgrade
The advantage to a circ pump is not saving money, it's getting the most out of your ozone/uv or built-in salt cell. Which makes it worth every dime in my opinion.
I agree that the second pump is nice in a big tub, but is not always an option in smaller tubs.