Is a pump a resistive or inductive load?

I've got one of these pumps in a rainwater harvesting tank.
http://www.rainharvesting.co.uk/pdfs/In%26Out%20pump.pdf

Currently it plugs into a socket but I'd like to put it on a time clock so
we can set it to water the garden while we are away. The pump data says it
draws 1100W / 5.3A but

Q1: does anyone know if this would present an inductive load?

5A is probably too much for most central heating timers so I'll probably
have to use a relay. I'd hate for the contacts to weld themselves closed as
it would cause between 4,000 and 6,000 liters or water to be dumped on the
vegtables!

Q2: Are there any clever tricks that can be used to fail safe a relay? Two
relay contacts in series perhaps?




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