Reset button where is it located - Stiebel Eltron TEMPRA 24 Tankless Water Heater

Question edited for clarity. Looks like you encountered autocorrect

The manual is here. It doesn't mention a reset button.

Rheem RETEX-27 instruction manual and user guide

https://mans.io > Rheem > Tankless Electric Water Heaters

Rheem RETEX-27 Performance 27 kw Self-Modulating 5.27 GPM Tankless Electric Water Heater download pdf instruction manual and user guide.

But this says it does, or may have?

Where Is the Reset Button on a Rheem Hot Water Heater? On Rheem water heaters, the reset button is usually a red button located near the thermostat, at the middle of the limit switch. To access it, you will need to remove the metal panel on the unit. The red button is behind the insulation.

How to Reset Rheem Tankless Water Heater - Quick Fix

Gas water heaters have thermal reset button located on front, electric heater located on upper thermostat ....
http://waterheatertimer.org/How-to-troubleshoot-electric-problems-with-water-heater.html#parts
http://waterheatertimer.org/How-to-troubleshoot-gas-water-heater.html

On all models, you must remove the cover to access the thermal safety reset. MAKE SURE YOU DISCONNECT THE POWER BEFORE OPENING THE CASE. On Mini™ models, the safety thermal reset button is a round, flat, black button located between the wiring block and water connection pipe.
here's a video....
http://www.stiebel-eltron-usa.com/tankless-faqs
if it helps please click helpful :) & let me know thanks!

No reset button.
The gas control valve is the thermostat
http://waterheatertimer.org/How-to-troubleshoot-gas-water-heater.html#intellivent

Intellivent gas control can be reset, and Honeywell can be reset under some circumstances.
Otherwise, bad thermostat means replace gas control valve

Gene

If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7

Do I need to insulate this heater out in the shed?
Freezing temperatures

Question posted under Rheem electric water heater.

1) ECO red reset button is on upper thermostat, located under upper cover on side of tank.
It is covered with insulation. See images:
http://waterheatertimer.org/images/water-heater-thermostat2.jpg
http://waterheatertimer.org/images/Jly-022-thermostat2-175.jpg

2) Be sure to put cover and insulation back in place after pushing in reset button.
3) Push button inward very firm.
4) If reset does not punch back in, then replace upper thermostat.
http://waterheatertimer.org/How-to-replace-thermostat-on-electric-water-heater.html
5) Open following link for full troubleshoot resources:
http://waterheatertimer.org/How-to-troubleshoot-electric-problems-with-water-heater.html

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The reset button is located on the top thermostat, on the heater you will see a acess panel with screws in it to remove the thermostat and element is behind this panel. Once removed the top thermostat should have a red button to press to reset heater.
If it resets then wait for a little time for hot water. If this doesn't work then it could be the elements are in need of changing.

There is a reset button located behind the top cover plate on the side. Remove four screws to remove cover and carefully spread insulation apart to access element,thermostat, and reset button. It is a small round red button. If you push it in and it stays thens the element should come on. If it pops right back out then you need to look at changing the reset.Thank you.

Shut off all power to water heater at breaker panel,remove side cover where thermostat is located. Test that there is no voltage at connections, with meter, to be 100% sure you shut off correct breaker. Thermostat should have a red button in middle to depress to reset if it's tripped.

Reset button is on the top thermostat which is located behind the top access panel taht is removal. It will have a screw in it to remove and behind the insulation will be the thermostat..