Can the pump be too powerful? What about different connection sizes?

WildSalmon

I am in the process of building this plunge, I have the tub and chiller currently and am trying to get the other parts.

I had a question regarding the 1200/950 gph pump that people have used / recommended.

The chiller has a recommended flow rate of 396‒925 gal/h based on specs

Is there a problem getting a pump that is too powerful? ie 1200? or one that falls into the range, 700 gph (which is available on amazon right now, the 950 isn't) Does a too powerful pump reduce the efficiency of the chiller?

The 1200 has 3/4 connections while the 700 only has 1/2 connections.

Also the filter I was going to get has 1in connections.

Aside from the needed hardware does it matter if connections are changing sizes?

Or am I just over thinking (adhding) this too much?

wintermute

WildSalmon If you get a pump with a 1200 GPH rating it starts going down as soon as you connect something and start introducing friction into the water path. You will get nowhere near 1200 GPH when you have everything hooked up. For this build a 1200 GPH rated pump is just fine.

Also, don't worry about changing connection sizes but prefer larger connections over smaller connections when possible to reduce the amount of friction added to the system. Sometimes you have to work with what you have and ultimately, as long as you are still getting decent flow in the end you're good to go!