Originally Posted by Mr. Dan
Here's the last line in her email to me: "We suggest the pressure be set at 30-45 psi." Doesn't that seem a little low?
Houses that run on well water (like ours) have the pump regulated for 25-40 (sometimes 45 PSI). There are cheap fixtures that don't work well at those low pressures. But most will work just fine.
Your 12volt water pump from the water tank certainly doesn't put out 60 PSI.
When you are running lower pressures than city water (typically 60 PSI), filters and screens (especially faucet screens and aerators) have to be kept clean, and hoses kept unkinked. The cheap pressure reducing shower heads are the most troublesome. Removing the pressure-reducing restricting piece of plastic in the back will often restore a cheap shower head to decent performance - you are running low pressure anyway. Or get a decent shower head that works well at low pressures.
The whole point of the city water pressure limiter for your RV is to avoid excess pressure on your lines and fittings. City water systems often "spike" their pressures up to 100+ PSI (we often saw 110 PSI in Opa Locka, Florida) as part of their regular system checks and maintenance. 110 PSI will blow out a lot of seals on the lightweight plumbing equipment installed in RVs - it would periodically cause the valves on our fire suppression plumbing to leak.
just my experiences, yours may vary