Hot Water Heater on electric or gas
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Apr-24-2017 04:11 PM
I am new to the Onan, can you tell ?? :B
2020 Ford F350 SD 6.7
2020 Redwood 3991RD Garnet
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Seeking Advice
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Apr-27-2017 01:18 PM
The MH I sold today had that feature. It worked.
2017 F-150 XLT 4x4 SuperCab w/Max Tow Package 3.5l EcoBoost V6
2017 Airstream Flying Cloud 23FB
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Apr-27-2017 01:00 PM
To burn gasoline to make electricity to turn around and make heat is generally inefficient- particularly with a small engine.
Gas engines are not all that efficient...lots of heat blows out the exhaust, lots of heat blows off from cylinder heads and crank case and etc. Then your generator even has a cooling fan, and the wires to the water heater can heat up...lots of waste.
Lots of good heat that could OTHERWISE been used to heat water.
The water heater isn't 100% efficient either, but the burning gas goes 'directly' to heat up the water, instead of being blown off from a cylinder head, muffler etc. (At least it goes a lot MORE directly).
Now, I also get it that there's additional layers of complication. "The generator is already running"...that might move the scales some. LP from the camp store can sometimes be pricy versus gasoline- and $ wise? Who knows.
Also, there's a lazy factor...filling the gasoline tank can be easier than unhooking the LP tank, hauling it to the refill place, hauling it back, reinstalling it.
Still- small gasoline generators operate well below 50% efficiency while water heaters are generally above 50% in their energy conversion / transfer.
This is a geeky and pure engineering thought, but I've always wondered if there'd be significant energy harvested (and efficiency increases) if an 'exhaust pipe' could be routed into a boiler (or water heater)...Then we'd really be on to something 🙂
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Apr-25-2017 08:04 PM
After market kits such as the "hot rod" are lower wattage.
wildtoad wrote:
If you are running the gen anyway to power the AC or charge batteries the wh will not add much of an additional draw. I would not start the gen just to get hot water.
My ride is a 28 foot Class C, 256 watts solar, 556 amp-hours of Telcom jars, 3000 watt Magnum hybrid inverter, Sola Basic Autoformer, Microair Easy Start.
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Apr-25-2017 02:51 PM
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Apr-25-2017 04:32 AM
2020 Ford F350 SD 6.7
2020 Redwood 3991RD Garnet
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Apr-24-2017 08:24 PM
DutchmenSport wrote:
If you are powering with a generator, you'll probably want your water heater running on gas.
If you are plugged into shore power, it doesn't really matter which way you run your water heater, or even if you run both. Gas will recover faster than electric, and Gas will heat from cold faster than electric too. But gas and electric together are best for fastest recovery.
It's all a matter of how fast you want to heat your water and the available of electricity (shore power or generator).
exactly what we do.
2004 14' bikehauler with full living quarters
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2004.5 Silverado 4x4 CC/SB Duramax/Allison passed on to our Son!
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Apr-24-2017 06:54 PM
Blythewood, SC
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2015 Jeep Wrangler 2dr HT
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Apr-24-2017 06:46 PM
If there is enough wattage I would run the water heater on electric. But make sure brown outs are not happening when the compressor starts. If there are, then move the water heater to gas.
My ride is a 28 foot Class C, 256 watts solar, 556 amp-hours of Telcom jars, 3000 watt Magnum hybrid inverter, Sola Basic Autoformer, Microair Easy Start.
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Apr-24-2017 06:06 PM
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Apr-24-2017 05:55 PM
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Apr-24-2017 05:47 PM
Well heat faster and recover faster
Two A/C will use 25~30 amps around 4kw save the rest for other items in the RV
If ambient temps get really hot, the the A/C and generator will be working hard
But I Can Not understand it for you !
....
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1997 F53 Bounder 36s
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Apr-24-2017 05:33 PM
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Apr-24-2017 05:18 PM
2007 DODGE 3500 QC SRW 5.9L CTD In-Bed 'quiet gen'
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Apr-24-2017 05:07 PM
2017 F-150 XLT 4x4 SuperCab w/Max Tow Package 3.5l EcoBoost V6
2017 Airstream Flying Cloud 23FB