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Posted by Dee on July 07, 2007 at 22:46:19:
In Reply to: Re: Ergomax or equivalant posted by HeatPro on July 07, 2007 at 08:20:29:
: It costs what it costs to heat the water to whatever. It does cost more to heat water to make it hotter, as more energy is invested (the measurement being btuh in that instance.) The difference in cost is due to using more fuel to do so.
Thanks again. Have you seen a study or calculation based on this "does cost more...more energy is invested?" Something based on average house hold usage. And then have you heard of back-feeding this into your water-systems' overall "efficency"?
Let me reword my question like this:
Current radiant system runs water at 180 degrees.
Current hot potable water heater runs water at 120 degrees.
New radiant system runs water at 180 degrees.
New exchanger outputs hot potable water close to 180 degrees. Which requires it to be cooled down with a mixing valve.
For simplicity all three device run at the same efficiency (AFUE).
If "current" system was considered optimal what would "new" system be considered in a percentage of the "current" system.
If you had seen or heard of a study this would be ideal as many factors could be included such as start-up, evacuation, and so on. However, if there was a calculation that generalized that would be good too.