Quote:
Originally Posted by Jhnidy
If no water was used, how much would the tankless system cost to run for the rest of your life? That number is missing in your test.
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In the real world people use hot water in an occupied home leaving whatever sort of water heater their home has on. In a unoccupied home most people shut off a tank heater but they leave a tankless heater on.
A unoccupied home with a tankless heater on costs 72.4 cents in electricity per month (the sensor that checks for water flow is always on), while the same one with a tanked heater, shut off at the breaker, is zero.
My test was designed to test how much standby costs a tanked heater cost and if a water heater timer is economical. It did that.
You appear to want to know the efficency of heating water in a tanked heater or a tankless. It is the same. The overall efficency of heating water by electricity exceeds 99%, whereas the efficency of a tanked water heater is 97% the 2.xx% difference is standby costs or put a other way the cost to keep 40 gallons of water waiting for your use.