Tank less water heater - Fiberglass RV


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Old 08-06-2006, 03:32 PM   #1
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I found this unit on ebay and it is perfect for a camper but it's 240 volts. It's made in Germany. I was wondering if someone out there smarter then me could look this up and tell me if it can be converted to 110 volts and work the same way.

Rezi Water Heater

www.rezi.com.au
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Old 08-06-2006, 06:03 PM   #2
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I don't claim to be smarter than anyone, but I did look at the Australian website for this German-made heater featuring (according to the website) "Swiss technology"...

If they can be converted to 120 V, there are two methods I can think of offhand:
  1. if there are two heating elements in series, they could be connected in parallel (unlikely)
  2. perhaps the heating element can be replaced with one intended for 110 to 120V, if there is a version at our voltage for some other country (the element is so much of the heater, it seems unlikely to me that this would be economically viable)
Depending on model, the 230V units use 14 to 21 amps. If they can be converted to 120 V, for the same power it would use (for the same models) 28 to 42 amps. My whole trailer only has 30 amp capacity, so this may not be so promising.
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Old 08-07-2006, 06:16 AM   #3
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Precision Temp, tankless systems, located in Cincinnati, OH:

Precision Temp, Inc.
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Old 08-07-2006, 06:26 AM   #4
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Eemax makes one too.

http://www.eemaxinc.com/resrvmarine.htm
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Old 08-08-2006, 12:20 AM   #5
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Interestingly, 240VAC is usually available at modern RV parks -- The 50Amp outlet is actually 240VAC (but the interior wiring on the Bulgemobiles separates it down into two 50A@120VAC circuits for running stuf like two airconditioners).
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Old 08-08-2006, 11:55 PM   #6
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donna, the price on the eemax at my local plumbing wholesaler is $420 and it is a 20 amp unit, the smallest one. sigh........

always wanted one since being in Cyprus where it was the only thing for the apartment.
really sensible.
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Old 08-10-2006, 12:50 AM   #7
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Quote:
I found this unit on ebay and it is perfect for a camper but it's 240 volts. It's made in Germany. I was wondering if someone out there smarter then me could look this up and tell me if it can be converted to 110 volts and work the same way.

Rezi Water Heater

www.rezi.com.au
Have you considered a propane tankless heater? I had one years ago in a slide in camper that I had and it worked very well. After I replace my ice box with a refrigerator in my Burro this little heater is my next project.
Go to ebay and search item #110017699558. The last one sold for $181.00.
the dimensions are 11X17X4.
Hope this helps,

John
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Old 08-10-2006, 01:43 PM   #8
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I had not realized until Pete's note (and some web research) that "50 amp" RV service was the same configuration as a 240 V residential circuit, like that used for a kitchen range. I like the idea of upgrading to 50 amp service, using the eBay water heater in stock form, and having hot water on tap only when in a suitably serviced site.

It doesn't address Denis's question about the Rezi unit, but I think the propane option is a valid alternative. The following photo is a propane-fired demand heater mounted to the wall over the stove in a Boler B1700RG. The owner (and hopeful seller) of the trailer describes it as a "Paloma propane model #PH-3-3F with a 38,100 BTU rating".


Name:   kitchen.jpg
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Old 08-11-2006, 12:46 AM   #9
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A house I lived in in Germany had no central water heater -- Instead, each sink (and dishwasher and washing machine) had its own electrical demand heater (like the ones above) connected to the hot faucet. HOWEVER, the bath/shower gas demand heater was piped into a single spigot with hot and cold controls -- In order to get a smooth flow of even-temperture water out of the single spout, the hot had to be turned fully on and then tempered to cool with lots of cold water -- Otherwise, the tankless heater would rapidly cycle on and off, and the off cycle would be a jolt of cold water.
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Old 08-11-2006, 11:05 AM   #10
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The photo of the propane water heater is indeed a paloma.
I looked for a paloma to use in my rig but found they were out of production.
Though I still would have bought one, parts for repair would become scarce.
So I elected to install a Bosch Aquastar LP demand water heater and it is a great alternative. They are available through Lowe's or Home Depot or many other places.
Parts should be available since they are still in production.
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Old 08-11-2006, 01:41 PM   #11
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Tom, could you show a picture of your tankless propane water heater? Venting and such? Please? Someday hope to install one.
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Old 08-11-2006, 01:53 PM   #12
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We recently bought a Water On Demand by Coleman and it is a great alternative to going through the hassle of installing a water heater. If you are interested go to www.coleman.com



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Old 08-11-2006, 03:05 PM   #13
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I once had photos of the install of the LP demand water heater but the thread was lost due to malicious hackers. Sorry. One day I'll take photos again.
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Old 08-11-2006, 03:29 PM   #14
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How about something in the InSinkErator line? Are you looking for hot water at the kitchen sink, shower or both?

InSinkErator
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