you probably wont. I also live in a townhouse and as they try to make us all use less water they put a tiny line onto each tap in the house so you have bugger all pressure. my unit wont go past 20psi without a booster pump.
my water lines are all connected to the main in the cupboard under the stairs in the garage where my water tank is. the mains are tiny so I have no way of increasing pressure.
Dunc
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