I have an older non-VS pump but am thinking about moving to a VS pump for noise and energy considerations. One consideration is that I have an evacuated tube solar heating system so I run my pool while the sun is up to take advantage of the solar heat. It also isn't good to leave still water in evac tubes in the summer. This will also, I think, require me to run the pump at a higher speed to keep up the flow through the tubes and also due to the fact that it takes more power to pump the water up to my roof.
Therefore is it still worth it to get a VS pump and if so what should I look for in a pump given my circumstances? My existing pump is 9 years old - do these pumps have a lifespan so that mine may need replacing soon? My pump runs for about 12-14 hours per day for about 5 months per year or roughly 90 pump days per year. My pool specs are in my sig.