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HVAC, Air Conditioners, Aqua Hot, Primus, Webasto, Chassis Heaters, Furnaces and Water Heaters Questions and information about the wide variety of Heating and Air Conditioning as well as Water Heater systems available are discussed here.

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  #1  
Old 04-05-2012
gcyeaw's Avatar
gcyeaw gcyeaw is online now
Gardner
 
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Default Tankless Hot Water HEater

Someone I know was looking at this for a motorhome.
http://www.excelonlinestore.com/servlet/the-388/1.6-gpm-SILVER-LPG/Detail

It is non-vented but contains technology that shuts it off it the Oxygen levels get too low. Per other research--Propane combustion produces Carbon Monoxide when the Oxygen levels are below the level that triggers the shutdown. Above the shutdown level apparently there is no CO issue.

Any comments? I don't think it is a good application in the confined Motorhome environment. I haven't contacted the manufacturer for their take on the idea.
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  #2  
Old 04-05-2012
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Gardner
We installed a Rianni tankless on the house,outside under carport..
Our concern was heat transfer to wall,solution mounted on brick wall.
Carport install also protects from weather and easy access for checkups.
The Rianni ventless I would not install inside the heat would REALLY be hard on AC in the winter you wouldn't need much other inside heat when
water heated was on. Thinking back I don't think the ventless is to installed inside at all, the heat of combustion has to go somewhere.
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  #3  
Old 04-05-2012
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If interested here's a weblink for them;

http://www.youtube.com/watch?v=HuTVLlgWGM4

not too informative...
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Old 04-05-2012
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Have you noticed that Atwood has just introduced two tankless models for RVs. These may be worth considering. My Bird has water heated by engine heat or electricity only which is a dry camping problem. I would like to head domestic water with Diesel or Propane.
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Old 04-05-2012
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I did see one new model, will look again. Although during my research to replace my water heater I did find that both Atwood & Suburban make an Elect/Gas/Heat Exchange water heater.

Although I'm not really interested in the heat exchanger (as our old units have) you could use that to heat your engine block in very cold weather using propane and your recirculation pump.

So that could be of great importance to a lot of you "Snowbirds" Personally I'm looking more at the Elect/Propane models now and they come in 6, 10, & 12 gallon models. Other capacities are available but these are pretty standard now.

I'm also still looking to relocate the water heater closer to the sink/shower area to aid in water use reduction while dry camping. The space free'd up under the bed would allow for a larger fresh water tank.
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Old 04-05-2012
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Thanks food for thought. I don't really have a good experience base with my rig but think having electricity, fossil fuel and engine heat to heat domestic water. I would be nice to have hot water at lunch time while on the road or first thing when stopped for the night would be nice. I also think in terms of managing consumables and resources the more options the better.
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Old 04-05-2012
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Quote:
Originally Posted by Ed Wimberley View Post
Gardner
We installed a Rianni tankless on the house,outside under carport..
Our concern was heat transfer to wall,solution mounted on brick wall.
Carport install also protects from weather and easy access for checkups.
The Rianni ventless I would not install inside the heat would REALLY be hard on AC in the winter you wouldn't need much other inside heat when
water heated was on. Thinking back I don't think the ventless is to installed inside at all, the heat of combustion has to go somewhere.
hi ed
i too have a rianni...mine is inside vented to outdoors, the model i have shows service alarm code if unit starts to build up lime/minerals on water side of heat exchanger most cheaper units don't so buyer beware...doesn't take much build up to impair heat transfer...i like rianni alot but don't think they are suited for BB. just my opinion
mike
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  #8  
Old 04-05-2012
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Mike, how often does your unit "alarm".

I went tankless years ago at home with an electric unit. Years later and long story short, I'm back to a standard water heater now.
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Old 04-05-2012
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hi Michael
i use a good softener and still need to clean once a year...water here is vary hard twice a year is not unusual in Peoria area though.
mike
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  #10  
Old 04-05-2012
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I had similar issues here in Mesa, AZ.

Water is very hard and the tank-less heater design accelerates mineral buildup due to the small heating areas around the elements. Not only was yearly maintenance a necessity (if it lasted that long) it was also very hard to perform mounted up on a wall.

I'd also find the elements all eaten up by corrosion and then found the elements themselves a non-standard size so you could not replace them from your local handy man stores.

I ran a full house filter (as recommended in the install) however still had sticking flow control issues. The final straw was when is stuck ON and melted itself. The unit came apart and sprayed water all over the garage. Luckily I was home and heard the noise.

As you can see I took a lot of interest in the plumbing and filtering. I actually purchased a "spare" and could run either or both depending on needs. Think about, I had the "option" of running 50a or 100a.

Not too bad for an old '75 house with a 125 service.
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eMail=Mike.Putz@cox.net | Web=http://mikeputz.com/
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