Per another post, I too have had good (but limited) experience with
Unless you need at new pump/motor right now, I would not recommend
replacing a perfectly good one just to get the reducing energy usage.
But the decison really depends on "the numbers".
The whole idea of using a two speed or variable speed is to reduce the
flow rate through the system (gpm) ......
The power needed to do the job of circulating the water is represented
by the product of flow rate (gpm) & system pressure loss (psi)
through the system.
Reducing the flow rate (say from 80 gpm to 40 gpm), the pressure loss
through will only be 25% of the original since pressure loss though is
piping system goes roughly by gpm squared.
and since the flow is down by 50%....... 50% of 25% is 12.5%, so
the pump will only be required to supply 1/8 the original power.
But since you;re only moving 40gpm, you'll have to run the pump twice
as long to filter the same amount of water per day and get comparable
This will still result in reducing your daily power consumption by
75% (if the pump is only run on low speed).
Your actual savings will depend on how you operate the new system, the
of low speed & high speed operation.
If you currently run your one speed pump 6 hours per day ....that's
about 75c to $1 per day.
If you save 75% to 50% of that (depending on speed mix) that would be
about 60c or 70c per day.....
$250 per year, not bad.
How much does a new pump / motor, new controller & installation cost?
This sounds like a very good ROI and a payback in a few years.
Of course the best way to save money on keeping the pool clean,
is to reduce running time until the pool is no longer as clean as
you'd like and then add some running time.
This game can also be played with you new system.
When I had a pool, I used cut back running time based on season, pool
usage, dirt loading.
Winter in SoCal, don't use much chemicals, pool usage (not heated) was
way down so I ran only a few hours perd day.
Summer usage required much more run time.
Giant party (parents away) required extra chlorine & increased run
And keep your eye on your Pool Man......
I would reduce the run time, he would increase it. He preferred to
spend my electricity to help him look good. :)
From my utility company web site: (offers $200.00 rebate)*
"While Two-Speed Pumps are adequate for older pools, Variable-Speed
Pumps presently provide the greatest potential for energy savings.
Variable speed pumps allow greater flexibility and can be programmed
for multiple speeds at the desired flow rate for each application."
Here are several good reasons to replace your single-speed pool pump
- Save up to 80% on energy costs associated with pool operation
- Variable speed pumps run cooler and quieter, which helps the pump
- Filter works more efficiently to keep the pool water more clean,
clear and healthy "
I would consider the Pentair brand.
"terri" wrote in message
can anyone recommend a specific type or brand of pump/motor, 1 HP max, for
my current understanding is that there are two speed motors that run at low
(half power) enough to
circulate water and can be switched to the full speed to run automatic pool
(like creepy crawly, pool vac)
I use a Hayward for an inground 16 x 32 x 9.5 ft pool. It's 230 v x 7.5
amps. Most people in my town use Hayward motors and all three swimming
pool sales and service shops sell them and recommend them.
It's easy to prime, and easy to clean the strainer. My pump runs 24 hours a
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