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Old 01-18-2008, 10:55 AM  
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Default Rinnai tankless water heater and a power outage

I know they have back ups that give you power for a few hours when the power is out, but someone was telling me of a way to rig some contraption with a battery and some wires so I can light the pilot light when the power is out and have hot water. Anyone know wanything about this?

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Old 01-18-2008, 03:02 PM  
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They are probably talking about a power inverter. This is a device that hooks up to a battery (like a car battery) and delivers 110 volts AC, like your house electricity.

There are two flavors of inverter; modified sine wave (cheap) and true sine (about 3 times as much).

If your water heater has solid state devices it might not operate properly on a modified sine wave. You might ask the manufacturer (866) 746-6241 ((866) RINNAI1) or else borrow an inexpensive inverter and try it to see if it works.

Last edited by travelover; 01-18-2008 at 03:06 PM.
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Old 01-18-2008, 05:37 PM  
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Default Yup

You could probably buy a cheap generator to annoy the neighbors.
I agree with Travelover, you should contact the company for a type of inverter for the battery power. You don't have to buy theirs, just find one with the same sine wave....Ok ...OK. is a good start. It is a magazine with the type of info you looking for and where I first read about them . Type in "inverters" at the search engine to learn more about them.
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Last edited by inspectorD; 01-18-2008 at 05:43 PM. Reason: Thought of something else.
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Old 02-14-2008, 11:54 PM  
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Default Burrr...

Cold showers suck, don't they? I agree with inspectorD, you can get a very quiet, very small generator, 1000 watts, for around $300. You could save yourself a car battery and an inverter, and now you can also cycle your refrigerator and freezer durring the power outage. Might be a better investment for your money in my opinion.
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Last edited by triple D; 02-14-2008 at 11:57 PM.
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Old 02-15-2008, 07:44 AM  
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I have heard talk of people wiring tankless h20 heaters into a UPS for a computer, as a battery backup that way...not sure if that is advised/warrented, but the installer of our tankless unit said he had seen it done...

if you are in a hurricane prone area, you may want to look into a generator system that you would simply plug into an outlet near the panel, and have certain circuits wired into it....a bit more expensive, but it will very easy to use once you need it....
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Old 01-25-2013, 07:58 PM  
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The problem with UPS systems is that crazy beeping noise emitted when the power is off (duh! Like I couldnt tell) We have a Rinnai unit which normally draws 2 watts just to light the panel, etc. but fires up 76 watts when the igniter is in play. Hardly a need for a 1000 w generator, is it?

Same sort of grief when looking at power backups for security systems b/c they have a 1-5w system draw. (Why would you want a security system without a battery backup?) Those systems could not handle the 76w draw.

Rinnai sez they do not offer one. Love the tankless with its remote, but not happy about not having a quiet 2-3 day backup battery system for the igniter.

Other ideas??

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