Yes, dynamics between pump components are complex. To ensure optimal output, Maelstrom pumps are engineered to run at their sweet spot. Also designed for the low speed to provide sufficient flow for the heater circulation at a low current draw (for a 2 speed pump).
The MS-1 has a standard 2.0 inches intake and discharge.
The dimensions of the MS-1 are 16.95 inches by 8.16 inches by 7.94 inches.