Repiping Cost For 2 Toilets + 1 Kitchen

Dear All,

I am in the middle of looking for contractor to do my piping.

I am thinking to install storage water tank.

The problem is I need to do repiping.

1) may i ask how much it costs to do repiping for hot & cold for 2 toilets + 1 kitchen sink using stainless steel pipe?

2) if i do away with kitchen hot piping, will the repiping cost be reduced a lot?

3) if i am using instant heater, will the repiping cost be reduced a lot?

Thanks for your enlightenment!