Question about Rheem Tankless Hot Water Heater Rtg-74pvp-2 7.4 Gpm

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If there is an electricity failure how can we have a hot shower

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Easy answer is you cant on these units. These tankless units store no hot water and need a 240V power supply to operate.

However!
In some areas in far north Queensland I came up with a back up power unit (I used to work for Rinnai who make similar units). These were for remote units that used battery lighting and just wanted a bit of hot water for remote workers.

Basically you need a spare car batttery and an electrical inverter or a back up petrol generator. These hot water units only use a very small amount of electrical power even when that are operating. I had a guy run the hot water for nearly two weeks on a car battery and inverter after cycone Larry hit Innisfail in North Queensland.

Depends how often you get power losses as to how much money you want to spend to cover yourself (99.9999% don't bother with no real hassles).

Posted on Aug 01, 2010

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Posted on Jan 02, 2017

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1 Answer

I have a problem with low hot water pressure can you help would an elec shower help


1) If possible, it is Best to solve pressure problem before installing new shower.
http://waterheatertimer.org/Low-hot-water-pressure.html

2) If the cold water has good pressure, then Electric shower could fix problem ... but shower would have to be connected to the cold water line and not the hot.

3) Seems the expense of adding a electric shower would be greater than having plumber fix low hot water pressure.
Assuming you have access to plumbing pipes, and this is not apartment building.

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http://waterheatertimer.org/How-to-troubleshoot-electric-problems-with-water-heater.html#skyrocket

Press reset button located on upper thermostat.
Test elements for short to ground against steel tank.
Clean sediment out of tank. Check for water leak running hot water out of tank.
Replace both thermostats.
http://waterheatertimer.org/How-to-replace-thermostat-on-electric-water-heater.html

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