I would not recommend using or connecting the head directly to a pressure freshwater system... or to your freshwater system at all... the risk of contaminating your potable water tanks is not worth risking.
The way my system is setup on my boat allows you to safely use the head sink to flush the head as the drain to the head sink has a diverter valve that allows the sink to drain into the head pump system or out the through-hull. The sink acts as a massive vacuum break and prevents almost any risk of cross contamination.
If you have a pressure water system, you can plumb the head sink this way, and use the freshwater to flush the head. Also, it works quite well for winterizing the head.
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You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.
—Cpt. Mal Reynolds, Serenity (edited)
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Still—DON'T READ THAT POST AGAIN.