I want to increase the flow rate of water from the house pump.

Two kitchens, 3 bathrooms, large garden area, sprinkler system.

Piping is 0.5".

Not knowing anything about pumps, I read to increase the flow rate I need a larger (or more revs) pump.

I was thinking of a variable speed pump, 90Lpm or greater, 42 psi, something like that.

Any ideas?

Have a look at Grundfos. I'm using one for  3 houses and set the pressure between 2,5 and 3,5 bar. There are tables on their global site with pressure and flow charts for the pumps. An old house with glued blue pipes might not handle too high pressure. Pipes do but glued connections might not. They are not cheap, but you get what you pay for. I got a 3 stage pump that holds flow and pressure in all points. 

 

 https://product-selection.grundfos.com/categories/pumps/end-suction-close-coupled-multistage?tab=categories

90 lpm is a big pump. The Grundfos CMB5-37PM1 670W would do, but they're proud of it. 

 

Were it me, I'd think about using the old pump for the garden and get a new pump for the house. 

Thanks

At the moment it's the same 305 W pump. 

Just took the filters out of wife's shower. She's happy now.

Have another  feed coming online for the irrigation...

Soon.

Definitely need some rearrangement but the other short well pump for the sprinkler has a jet pump and small stones keep getting lodged in the bottom stop valve, therefore no head.

So see if the shower head fix fixes some complaints.

 

It is more complicated than putting in a bigger pump. To get more volume, you need a bigger pipe. The higher pressure will make your pump cycle too fast and wear out the motor. In effect, your electric bill will go up but the service will not get any better, particularly when the devices have volume limiters. Most people have pumps that are bigger than they need and are running way off the curve.

14 hours ago, cjinchiangrai said:

It is more complicated than putting in a bigger pump. To get more volume, you need a bigger pipe. The higher pressure will make your pump cycle too fast and wear out the motor. In effect, your electric bill will go up but the service will not get any better, particularly when the devices have volume limiters. Most people have pumps that are bigger than they need and are 

Too late for new piping. Unfortunately when I built the house the local consensus was install 0.5" pipe.

Live and learn. 🙂