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upper & lower thermostat settings
Hey folks, Is there a right way to set upper & lower thermostats on an electric water heater? Should they both be set at the same temperature, which is what I've always done, or should one be higher than the other?
- The manual says they are both factory set at 120°.
- One of my tenants changed them both to 150°. I admit I'm embarrassed I didn't catch the higher water temp and I've added a DHW temperature check to my turnover checklist.
- A service tech, who was there to test the elements & thermostats, set the upper to 130° and the lower to 135°. This would make the lower element do almost all the work, right? The tech claimed that Rheem suggested these settings even though it ships from the factory with 120 & 120.
Any thoughts on the 'right' way to set those stats?
PS - the elements and thermostats were working properly; tenant wasn't used to slow recovery of an electric. I've also added a "electric water heater chat" to my tenant walk-through checklist. This was an expensive lesson!
DIY'er ... ripped out a perfectly good forced-air furnace and replaced it with hot water & radiators.