No, the power supply into your home is not 220W.
If you live in North America it is almost surely a dual 120 / 240 VAC supply system with Grounded Neutral. This means that most wall outlets are 120 VAC, but the higher 240 VAC is available for heavy loads like a stove or an electric clothes dryer.
In many countries in Europe and elsewhere the supply to your house is 220 VAC, and you Do get 220 VAC from the wall outlets. BUT that is VOLTS supplied, not WATTS. Watts (which is power consumed) it the product of the supply voltage times the amperage (current) being drawn by the device plugged in.
In your case, OP, replacing your PSU unit with NO other changes will make almost no difference to how much power your computer uses. The power actually consumed from the wall outlet will be the power actually used by the components of the computer, divided by the efficiency (as a fraction) of the PSU. So, for example, if the internal components were consuming 200 W before the change, that part will not change. The SMALL difference in what actually is consumed from the wall will be because the efficiency of your new PSU may be BETTER (higher) that the old one, so it will draw just a little bit LESS than the old PSU.
Now, that all is based on assuming you are NOT changing anything else in your computer. If you do change something (say, a new video card with much more power and hence consuming more electrical power), then the overall system will use more power from the wall. But not a h8uge amount more. For example, if a new component consumed 10 amps more power from the 12 VDC rail (and that is a big increase), the draw from the wall would increase by 0.7 amps.
Let's put a few limits on this to ease your anxiety. A 500 W PSU with a good 80% efficiency rating would consume from the wall at MAXIMUM 500/0.8 = 625 Watts. At 220 VAC supply voltage, that would be 2.84 amps. You should check the fuse or breaker rating for the wall outlet circuit in the room, but I expect it is rated for 10 to 15 amps. Unless you already have a LOT of heavy electrical devices connected to this circuit, the change in your PSU will make virtually NO difference at all.
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