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Old 02-13-2014, 11:15 AM   #1
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electric water heater???

Hi there. I've been full timing it for almost 3 years now. I am considering going to an electric, tank-less water heater. I am hoping somebody has either done this or at least can tell me some pros and cons of this conversion.
here is something that I'm looking at...
Stiebel Eltron DHC 3-1 Electric Tankless Water Heater, 120 Volts
does anyone have thoughts or suggestions?
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Old 02-13-2014, 01:10 PM   #2
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Originally Posted by diggersanddo View Post
Hi there. I've been full timing it for almost 3 years now. I am considering going to an electric, tank-less water heater. I am hoping somebody has either done this or at least can tell me some pros and cons of this conversion.
here is something that I'm looking at...
Stiebel Eltron DHC 3-1 Electric Tankless Water Heater, 120 Volts
does anyone have thoughts or suggestions?
The biggest issue is, will you always be hooked up to a 120vAC power source when using it? Anything that has heating elements tends to be an energy hog, and the information on the link you provided indicates that it draws 25 amps all by itself. Once you have an answer to that, the rest is just details on where to put it and how to run the plumbing.
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Old 02-13-2014, 01:53 PM   #3
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I only know of one that someone recently ordered a 5W with tankless water heater and after a couple of nights, they had it taken out a gas/electric put in. Their comment was not enough HW to shower.
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Old 02-13-2014, 02:37 PM   #4
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Our '65 Caravel has a Presiontemp RV 500. Uses 12v and propane. Only heats what is being used. It will provide how water as long as you feed it propane and water. Works on demand. Turns on and off as hot water is needed. Down side is that it uses some water to get started, which is a small issue when dry camping. Up side it works without a generator when dry camping.
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Old 02-13-2014, 02:57 PM   #5
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Why reinvent the wheel? Remember that new solutions have new problems. On demand water heaters with 240v do not work very well. I just imagine that a 120v water heater would not work well either since it has half the power available to heat the water.

Unless you are talking about a park model, I don't think it is wise to install a 120v water heater in a travel trailer, especially an Airstream. It will be a real liability when it is time to sell.

I would install a regular 6 gal propane/elect water heater. Since you are only storing 6 gallons of hot water there is not a huge difference in the amount of energy used to heat water between an on demand water heater and a 6 gal rv water heater.

Dan
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Old 02-13-2014, 03:07 PM   #6
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Remember also that the 120v heater takes 25 amps to operate. You only have 30 amps service to start with. This means that you can't operate the microwave or AC while you are heating water and it would require new #10 wiring and a 30 amp circuit breaker for the on demand water heater.

Dan
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Old 02-13-2014, 05:04 PM   #7
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Per their specs, it 1 GPM it delivers a 20F temperature rise, and uses 25A to do that... I'd charitably describe as useless for providing domestic hot water for a trailer you're living in. It's something for providing hot water to wash hands at a remote sink or something.

As TouringDan pointed out, even 240V electric demand water heaters are sub-par, I don't think this can compete with a bog-standard 6-gallon Atwood, much less the PrecisionTemp propane-fired demand heaters.
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