Eco swimming pool pumps need to be run longer, so do they really save?
Variable speed pumps are the future… carbon emissions mean electricity companies are trying to get us all to use less power. The average swimming pool pump will cost the pool owner around $1100.00 per year in electricity costs. Eco pumps can reduce the running costs considerably… typically down to around $200.00 per year, which is quite significant.
The typical ECO pump has three speeds – High, Medium & Low. With some ECO pumps, these three speeds can be varied slightly to suit the pool owners need, e.g…. if the pump is installed a fair way from the pool or the particular pool cleaner needs a tad more flow, the pool owner can increase the speed slightly to compensate for this.
A fixed speed pump, or your typical pool pump, has always a fixed flow rate and a fixed running cost per hour.
An Eco pump can change the flow simply by changing the speed – the lower the speed, the lower the flow & cost to run.
The running cost savings can be extensive due to what is termed the Pump Affinity Laws:
A change in speed equals a change in flow.
A change in speed equals a change in head-loss squared.
A change in speed equals a change in power usage cubed.
What this effectively means is that if you halve the speed (mid speed) you halve the flow, get a quarter of the head loss, but use only 1/8 of the power. Run it twice as long to get the same amount of water filtered each day and save 75% of electricity in doing so. Change the speed to a third (low speed), and the power usage drops to 1/27, run it three times longer and use only 1/9 of the power!
Sounds good doesn’t it – and it really is. The power saving in just one year, will pay for the pump!
What pool owners need to understand here is that with an ECO pump, you must run it longer than your older fixed speed pump, as it is important to get the same volume or water filtered each day.
All ECO pumps will start up at the highest speed for a short period to ensure the pump is fully primed, then will automatically drop back to the set lower speed. The only time you need to run on high, is when you need to manually vacuum the pool, or for backwashing the sand filter. Mid speed can be used if using a suction pool cleaner, where low speed is where you make most of the power saving and should be used in most cases to take advantage of maximum power saving.
Do I need to change my filter if I change over to an ECO pump?
Simply answer is no. A standard fixed speed pump, runs at around 2800rpm and can place a lot a stress on pool equipment. Have you ever noticed your filter expand & contract when the pump turns on and off? A filter actually filters water much better at a lower flow rate over a longer period.
Eco pumps are the future. At Direct Pool Supplies we keep all the leading brands. Call or email us for the correct ECO pump to suit your needs. Many are even a retro fit for existing pumps, where others will require a plumbing change.