Alpo Posted December 24, 2022 Share Posted December 24, 2022 To have a thermostat on a water heater so precise that it would keep water to the 10th of a degree? There's an old movie called HOW TO MURDER YOUR WIFE. It starts off with Charles ("I am Mr Ford's man") giving you a guided tour of the premises. "This is Mr Ford's townhouse." "This is Mr Ford's rooftop garden." "This is Mr Ford's shower, set to precisely ninety-eight point SEVEN degrees - Mr Ford's body temperature." I thought that was a very cool bit of business. I don't think they had the ability to do that back in the 60s when the movie was made, but I wonder if they could do it today? Link to comment Share on other sites More sharing options...
Marshal Mo Hare, SASS #45984 Posted December 24, 2022 Share Posted December 24, 2022 Given enough money…. It can be done. I would engineer it, for my usual fee, of course. Link to comment Share on other sites More sharing options...
Dusty Devil Dale Posted December 24, 2022 Share Posted December 24, 2022 Every thermostat has a factory set hysteresis, which is a particular number of degrees above or below the setting at which the burner or element turns on or turns off. I suppose it would be possible to set the hysteresis very tightly around the nominal setting, but the heating element or burner would be turning on and off so rapidly that a very large fraction of the energy would be wasted. Usually hysteresis is about 3 deg F plus for shut off and about 1 degree F minus for turn on. So set at 68 deg, it turns on at 67 and off at about 71 for a four deg range of variation. Link to comment Share on other sites More sharing options...
Cholla Posted December 24, 2022 Share Posted December 24, 2022 We used to install these if absolute control was required but I only used them for air, not water. https://necc-controls.com/thermostats/accustat/ A proportional control would be better but it requires more equipment and more cost. I also think most folks would find 98.7 too cold for a bath or shower. Link to comment Share on other sites More sharing options...
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