underfloor heat

This is the underfloor heating for the bedrooms-- isn't it cool? They will pour gypcrete over this as soon as the septic tank is in and we have water to mix in it. I am so excited about this type of heating. I was talking to someone just the other day who has the same heating and he says he has never raised his themometor gage above 68F. (The geothermal heats the water to 64F!) The top picture is the manifold-- this is the place all the pipes come out of the floor and hook up to the pump.