02-09-2009, 07:00 PM
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Another factor could be the thermometer on the heater. In my experience most of the level the heater's thermometer claims it will heat to will not be the actual temperature it puts out. Most heaters actually heat the water to a temperature colder than the stated temperature. Lastly, it is safe to use any water from a tap if you use a chemical remover like aquasafe.
You should be able to buy this at any LFS.
P.S. before you buy another heater try to crank up the heat on the heater and see what happens go up a few degrees each hour an see what your thermometer says.