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| http://waterheatertimer.org/pdf/thermostat-calibration-range.pdf Calibration: all mechanical thermostats are calibrated approximately. Actual shut off temperature can vary by +10°F or -10°F The temperature in lower part of tank can drop by 15-25° before heat turns on, but upper part of tank will still be hot. Tank should deliver 70% of tank volume before usable (104°) water runs out. Water heating rule-of-thumb allows 15-25° drop in temp before thermostat is considered out-of-calibration.... You can replace ELECTRIC thermostats using a different brand The following link gives specific parameters: http://waterheatertimer.org/How-to-replace-thermostat-on-electric-water-heater.html The TP valve on residential-type water heater will release at 210°F TP valve code You can override the mechanical thermostats by using a PID to control water heater ... for precise control of temperature ... information and wiring illustration following link: http://waterheatertimer.org/Add-another-thermostat-to-gas-or-electric-water-heater.html#PID |
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