Someone doesn't know how restrictive the popular heater cores are?
100gph used to be okay for a pump back when people used tube style radiators. But after someone discovered that the heater core out of the heater in a car also works well and has a larger surface area, flow was restricted and had to be increased...
Also Stacked Plate radiators are also part of that.
Oh yeah, brute force usually creates heat or unwanted pressure. Superchargers use brute force compression to force air into your engine...it works...but it creates heat...and pressure(but we want the pressure).
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