if you want something to stand up to better heat/cold temps use systesm 636 pvc or cpvc used for flue gas venting
not sure what the laws are in other provinces or states but in ontario it's a must so it's easily available (required to have a gas fitter license)
http://www.ipexinc.com/Content/EN_CA..._System636.asp
btw check here for immersion heaters
http://www.chromalox.com/products/im...g/default.aspx
NOL have you tried to drill through hard materials with that hole saw? like dense LVLs, espanite, or sheet rock?
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