VEVOR Surface Cleaner, 4000 psi Pressure Surface Cleaner, 18" Pressure Washer Surface Cleaner 1/4" QC Pressure Washing Surface Cleaner Stainless Steel Pressure Cleaner for Decks with Twin Rotary Arm

Yes.

Yes, it will.

Yes, use a snap wrench to hold the tip and remove it counterclockwise, then install a new tip clockwise.

As long as the ground is not uneven, it will be fine.

It will work with hot water, but the hot water should not exceed 60 degrees, otherwise the operator will be injured if not properly protected.