It is time for me to replace my single speed pump, and many online articles say that just in one or two years the price difference will be covered by your electricity savings if you buy a VS pump. Could someone please help understand the math of this statement? For example, a single speed Hayward 3207 Tristar installed was quoted to me at $635 installed while Pentair Superflo VS was at $1200. The difference is $565. If I pay about $0.12 per Kwh and I run a single speed 3/4 hp pump for two hours a day at 1.25 kWh, it is about 30 cents per day. If I run the pump 365 days a year, it is $110 per year. Is my math wrong? Is two hours per day too little? For how long and at what HP level will I be able to run a VS pump to get the most savings?