I have recently completed a bathroom and activated the geothermal floor heat. Unfortunately after 5 days I am not attaining much warmth in the room. I have raised the floor temp from 60F to 69F at the beginning of the floor coil and 66F at the end and the overall room temp is about 61F. My input water temp is about 100F. I fear that I do not have sufficient 5/16 tubing in the floor. The contractor who designed the floor system specified Uponor Quick Track. By the time I avoided the vanity, tub and shower space all I managed was about 75 feet of 5/16 tubing. Any contractors out there who can suggest how much tubing I should have had. I have jacked my tank temperature up to 104F. If I can attain that I'll try another degree. I also have about 35 feet from by manifold to where the tubing enters the bathroom. I am also going to insulate that run and see how much that helps. Unfortunately I am not going to tear out the bathroom to add more capacity so I may have to live with insufficient heat or add a supplementary heater. Any suggestions or comments will be appreciated. FYI I have a ClimateMaster 5 Ton Tranquility and a 120 gal. storage tank. The radiant heat in the basement floor is 1/2 tubing and produces sufficient heat with about 6" spacing on the floor loops (the bathroom is 7" spacing of 5/16 tube).