I have a concrete heated floor in my garage ,I used a 3/4 pex hose to heat my slab with hot water, what is the best way to circulated hot water in the hose ,starting with a heated tank like for the home use,going in the hose and circulated without stopping, I d'ont khnow if my question clear's enough

A recirculating pump comes to mind. Since I know nothing about heating systems would you like me to kick this over to a heating expert? Cheers, Tom

I have a concrete heated floor in my garage ,i used a 3/4 pex hose to heat my slab with hot water, what is the best way to circulated hot water in the hose ,starting with a heated tank like for the home use,going in the hose and circulated without stopping, i d'ont khnow if my question clear's enought
More info needed... like how much water(heat), flow, you want (need)?. what is the pressure lost through the piping, the spec on the pex hose

To actually calculate what you really need, might take more data than you could ever come by. I would pick up a pump meant for a small hot water system and hope for the best. Where did you get the boiler? Ask there about a pump. Whatever you buy, make sure it can handle hot water.