HOW TO OPERATE PANASONIC ELECTRIC WATER HEATER DH-6GM3-P

Flow sensors are here, but you need the model number as the information you gave is generic. You can put it into Google and look at the images tab to find your model.

https://www.google.com/search?q=replacement+flow+sensor+for+a+Trinom+Hotman+electric+tankless+system

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Yes the water heater will operate normally when power resumes.
Yes you can unplug 120volt water heater... and it's similar to a toaster oven or space heater, about 1000 to 1500 watts.
Or install a wall-type switch to turn it on-off, or install a FM1 timer module.
http://waterheatertimer.org/How-to-install-under-counter-water-heater.html
http://waterheatertimer.org/images/Grasslin-FM-1-with-terminals2a.jpg

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

Call Bosch. And exercise your 10 year parts warranty rights.
Copy following link for Bosch power star manuals:
http://waterheatertimer.org/Troubleshoot-Bosch-Tankless-water-heater.html#Ariston
Check circuit breakers, fully off and then fully back on. Test if voltage is at least 80% rating plate on unit. Check that temperature dial is set correctly. Call for service again.
Don't install tankless computer that heats water. You cannot fix this computer yourself, and they are problematic for owners.
Go to Lowes right now, spend $285 and buy tank-type electric water heater, roll it into your house, and save money, since the electric tankless computer heater costs average $100 more per year to operate than tank-type heater for average family of 4.
Tank type heater can be repaired by homeowner same day for $25 using off-the-shelf parts from hardware store. And that empowers the regular guy, and gets you off the junk tankless treadmill.
Gene

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

You want to know if this heater has Energy Star label.
I don't know.
Call Whirlpool 1-877-817-6750

Energy Star is a label that means nothing to you.
Manufacturers use energy-star label to promote a product as a money-saver.
They can put an Energy Star label on a giant 10,000 square foot house, and you know that cannot be the truth that a large house saves energy vrs a smaller house.

Energy factor, (energy factor/ not energy star) on the other hand, is a comparison measure how efficient the water heater uses energy to heat a gallon of water, when water heater is absolutely new.
EE3J50RD045V has energy factor of .59, which is completely typical and ordinary for electric water heaters.

The EE3j 50 gallon is an ordinary electric water heater, with ordinary average .59 energy factor rating, so electricity to operate this water heater is same as any other typical 50 gallon electric water heater: it will cost $35-45 a month depending on incoming water temperature, hot water use, thermostatic setting, electricity pricing, and whether you operate heater at peak pricing, etc.
http://waterheatertimer.org/9-ways-to-save-with-water-heater.html
http://waterheatertimer.org/How-much-does-it-cost-to-run-water-heater.html

The most important measure of water heater cost does not have anything to do with Energy-star or energy-factor.
The most important measure is total cost of owning and operating the water heater.
So if you spend $100 more to purchase electric water heater with slightly higher energy factor, then it will not pay you back. The difference will be $2 to $4 per year.
All costs are energy.
The total cost of operating water heater includes purchase price, installation cost, cost of repairs, cost of parts, whether you can fix it yourself, expected life of water heater, and replacement cost.
Every water heater has expected lifespan, and will not have resale value except current price of scrap.

Electric water heaters cost more to operate per month than same-size gas water heater.
Gas water heater might cost less over the life of water heater, but gas water heaters are increasingly expensive to repair, and increasingly more complicated, and cost more up-front to buy.

Electric water heaters cost less to buy, are easy to install yourself, are fully repairable by homeowner using generic off-the-shelf parts, and can be made to last many years by keeping tank clean and replacing anode rod every 2 years.
You can make ordinary 6-year electric water heater from box store last almost indefinitely.
Avoid electric water water heater that has electronic controls.
http://waterheatertimer.org/Clean-sediment-out-of-water-heater.html
http://waterheatertimer.org/Replace-anode-rod.html

Are you asking about tankless gas or tankless electric?

You posted under Tankless gas water heater: gas type tankless plugs into standard 120Volt household outlet to power circuit board. You need larger gas line than used for tank-type gas water heater.

If you are asking about volt and amp draw of Tankless electric, then that depends on specific model number.
For example, if each tankless element draws 3500Watts, and unit has 3 elements, you will need 3 additional 20 amp 240Volt circuit breakers. Volts x amps = watts. 3500 watts divided by 240Volts = 14.58 amps. At full blast, this unit would draw 43.75 amps and will cost more to operate yearly than tank-type electric water heater. If unit has 4500 watts elements, then it will draw 56 amps at full blast, and use a good percentage of household power.

Tankless water heaters have no hot water in power outage. This is true for gas and electric models.

Additional resources:
http://waterheatertimer.org/images/Compare-water-heater-parts-650.jpg
http://waterheatertimer.org/pro-n-con.html
http://waterheatertimer.org/pdf/Bradford-White-on-demand-tankless-service-manual.pdf

Yes. As long as it's an atwood 6 gal., the opening should be same dimensions. Keep in mind that you will need to supply hydro to water heater in order to operate it on electric, as well as switch etc. For electronic ignition of gas, you will need to supply a 12 VDC source, and switch as well.

1) Electric heater, do not touch electric heater that is wet or has been wet unless power is 100% off.
2) Gas heater: Same applies to gas heater if controls are electronic, or if electric is grounded to hot water pipe.

3) Manufactures suggest replacing water heater that has been flooded.
Warranty is voided.
Set next heater higher.
http://waterheatertimer.org/How-to-install-gas-water-heater.html

4) Electric: You can replace thermostats and elements, but if insulation is wet, the unit could short and be continual electrocution danger >>> and you can't operate electric heater with covers removed because cool air will keep thermostats from reading correct temperature.
5) Gas: You can clean out combustion chamber and replace gas valve and burner assembly, but new heater from local hardware or box store will save time and possibly money.

6) Use old heater as tempering tank if incoming water is cold:
http://waterheatertimer.org/Tempering-tank.html
Or use old tank as solar collector:
http://waterheatertimer.org/How-to-make-a-solar-water-heater.html

Add a comment for more free help.
Also take advantage of fixya expert assistance live.
For a price, expert works with you via while you work on water heater or any do-it-yourself project.
Fixya is always less expensive than a service call.

You can look into an electric flue damper. It must be tied into the heater controls so the fail-safe is that the heater will not operate unless it senses that the flue is open.

If water heater thermostat is bad, buy a generic thermostat at hardware store and install it according to instructions shown on link below:
http://waterheatertimer.org/How-to-replace-thermostat-on-electric-water-heater.html
I usually replace both upper and lower thermostats for about $28.
Lowes sells thermostats and elements.
If your water heater is a single-element/ single-thermostat, you can buy any thermostat with red reset button.
Technically a single-element thermostat has 1 less screw, but either thermostat will work.
If your water heater is 120V or 240V, the same thermostat will work of either voltage.
This is true because the thermostat is a simple bi-metal heat-reading device that does not operate on electric current.

That being said, you might want to test parts before replacing anything, in case problem is element.
To do comprehensive electric water heater troubleshoot:
http://waterheatertimer.org/How-to-troubleshoot-electric-problems-with-water-heater.html

Image below shows generic thermostat with reset button. Each of these will work for single-element or dual-element tanks with either 120V or 240V. Wires connect just as they did on old thermostat. Tighten wires very tight. Press in reset button to make sure ECO is set. Put insulation and cover back over thermostat when finished.

hello; no, unfortunately conventional elec. water heaters are only designed to operate in the upright position. one alternative is an electric tankless model. but beware there are a few things to explore about them before making the decision.