I installed everything myself for the floor heat. I divided the 30x60 heated area into 5 loops w 15" spacing. The pex tubing is 1/2" into manifolds and cost was $540. The heater unit and pump invertor panel was $2400. These prices were from 2008-2010 and purchased at Menards. The heater is electric off-peak demand control. The gas heater was higher hardware cost but would be more cost efficient to run if natural gas available. I insulated edge of concrete but should have insulated at least 4 ft. in from edge.