Suburban water heater uses 2 separate sets of t-stats....(under rubber cover 'Push to Reset')
One 120V AC set for electric' (left side---black wiring)
One 12V DC set for propane (right side----red wiring)
OEM both sets are the same temp setting
130*F for normal temp t-stat
180*F for hi temp t-stat
140*F/180*F Optional set available for either electric and propane
120*F/180*F Optional electric only available
If t-stats are OEM (have NOT been replaced) then they are same temp
Electric heating takes LONGER to heat/recover-----1440W element with a 6.2 gal/hr recovery rate
Propane is a 12,000 btu/hr burner with a 10.2 gal/hr recovery rate
Run electric and propane at same time......16.2 gal/hr recovery rate
NOTE:
If t-stat was NOT controlling the heating cycle then temp would go HIGH
If t-stat was faulty then NO heating would occur
IF element is scaled up due to HARD water source then heat transfer could be restricted....but that would just take longer then normal to reach t-stat set point.
So either you are expecting faster recovery with electric, not waiting until full heat cycle has finished or Electric t-stats have been changed out to lower temp set
Is it time for your medication or mine?
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US NAVY------USS Decatur DDG31