Ideally, we are looking at a few meters from underground tank

 

I emailed the manufacturer, and they confirmed that the datasheet contains an error — 35W appears to be accurate.

With this type of pump, I am experiencing some failures, which I believe are due to restrictions on the output flow. Is that normally the case?

 

See post #15, any restriction on the output usually results in lower current on the typical radial vane pump.

 

But can it damage the pump?

 

But can it damage the pump?

Not usually, only where flow is also used for motor cooling etc.

 

Previously, i have experienced impellers and shafts snapping.

 

Apart from the heat issue it can damage the pump if cavitation and/or surge occurs. What is restricting the output and what flow rate do you actually get?

 

Previously, i have experienced impellers and shafts snapping.

sounds like you need a better pump