My Whisperflo Pool Pump is making a racket. Is

It sounds like you either have a bad bearing or a broken impeller. This will not get better wioth time. You need to get it repaired.

This is a air leak on your suction side between the skimmer and the pump. You will not see water in the yard on the suction side usually, only the return. It is usually just the fittings around your pump or the seal around the pump lid, check those first and make sure you do not have a loose clamp or a damaged or dry seal. If that is not it then call in your local service guy to determine where the leak is. They will most likely pressurize your suction line to find the leak. Hope that helps.
Time to Open the Swimming Pool

sounds as if pump has stuck start winding switch , try giving Motor not the pump a sharp knock with a rubber mallet when you 1st turn on , this might jar it loose if not a new motor might be needed , if motor was larger then say 2hp then id say get it fixed at a motor repair shop due to cost saving but smaller sizes it's not worth it most times

I am as of yet unaware of any means in which a pool heater will make a pump explode, but am intrigued, certainly. Actually, I have never heard of any pump "exploding".
I would assume that there must have been some restriction that caused some sort of failure. Can you be more specific about what kind of damage occurred?

make sure all wiring is good loose wires can comprimise the life of a motor

try standing it on a piece of inch thick rubber type foam and see what happens

The noise is likely either the seal or a bearing in that order. If you are mechanically capable of working on the pump yourself then you can purchase a seal and gaskets at a pool supply store. If the bearings are bad then the motor needs to be replaced. In some cases a bearing can be replaced but usually it is more work than it is worth.

THE PUMP PICTURED IS A PENTAIR THE LITTLE CAP ON THE TOP OF THE MOTOR IS THE RUN CAPACITOR, TAKE IT OFF AND HAVE IT TESTED. BE CAREFUL THESE CAN HOLD VOLTAGE AND GIVE A NASTY SHOCK !SEARCH YOUR AREA FOR YOUR LOCAL POOL PUMP MOTOR REPAIR GUY WITH FREE TESTING..JAY

Sounds like you have a bad run capacitor and/or start capacitor. Assuming your bearings are good and the motor spins freely, have you noticed any loud noises, i.e humming, etc.? Sometimes capacitors can go bad. You can check the capacitor by removing that "hump" cover on the top of the motor, if it looks "bloated" it's bad. Be very, very care not to touch the electrical contacts due to high voltage stored in the capacitor. If this is a chronic problem, you may be developing a short in the motor windings and will have to eventually replace the motor. Hope this helps

Replace pump or have motor rebuilt.