Think it's more about Litres per min than PSI
A really old Shurflo 20psi pump that!, delivering 6.4 Litres per minute. If you ever
replace it don't get anything with a higher pressure if you have a water heater
it may not take more than 20 psi, a flow rate increase won't be of concern however,
so long as you only use the same quantity of water.
So which one please
Most people take this as a opportunity to increase the flow rate I did mine from 8 ltr to 12 ltr the pressure staying the same but a noticeable difference in the flow rate at taps and shower and water spins around toilet bowl. You'll hardly notice 6.4 to 7
As per screenshot 4 and 6?
I have the Shurflo 20psi, 7litres/min flow. More than enough flow rate
for my motorhome use. Any higher pressure and it would exceed the max.
(by a fair margin) allowed by the water heater rating, which is 13psi.
Shurflo used to make a 16psi unfortunately no longer available, I'd
have been happier with that.
Don't forget higher pressure means greater chance of leakage and
pipe splitting. When you turn a tap off, particularly lever/trigger types found
on shower heads it generates a degree of back pressure (water hammer)
ie increasing water pressure. That's why I've remained with flexible hose
type plumbing no leaks or splitting in 23 year age ancient pipework in my
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