Any 22mil copper pipe (SY7)

I'm making a log burner boiler for my hot tub and I was hoping if anyone has any lengths of copper tube l could use it would be great I have a bit and some fittings but still very short as I have to make it 12 ft away from the tub so it won't melt the pvc I'm connecting it to .I know it is a big ask but it is for this purpose only thank you for reading my add