Building water pump calculator

Pumping from the ground tank to the roof tank? Enter your floors and roof tank size to get the head, flow and pump size you need, with matching submersible pumps from our store.

Your pump

Required head –

Required flow–

Approximate pump size–

Riser pipe (PPR)–

How we calculated the head

Lift out of the ground tank
Building height
Roof tank inlet
Pipe friction and fittings
Total head

No in-stock submersible fits this head and flow, so we are showing surface centrifugal pumps.
No submersible or standard centrifugal pump fits, so we are showing multistage / high-pressure pumps.
Your ground tank is deeper than 6 m, so a surface pump cannot lift from it. We are showing submersible pumps only.
This pump pushes more water than your pipe size handles comfortably. Fit a valve to reduce the flow, or use a larger riser.
Pump outlet differs from your pipe size, so you will need a reducer or adapter.
A surface pump sits beside the tank. Fit a foot valve on the suction pipe and keep it as short as possible.
This building needs more head than a typical tank pump gives. Talk to our engineer about a multistage pump.
Fit a float switch or dry-run protection so the pump stops when the ground tank is empty.
Fit a check valve on the riser so water doesn't run back down.

Send the result to a WEC engineer

Suggested submersible pumps

View all submersible pumps

Planning estimate. Final selection uses the manufacturer's pump curve at your required head and flow.