Hydronic Heating a 13 Footer - Fiberglass RV


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Old 11-17-2005, 07:25 PM   #1
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I have just found a hydronic heating system used to heat a 24' Airstream. It can be seen at www.solarhaven.org/HPArticle.htm

I currently own an '82 Burro 13. I would like to install a system like this one. Eventually I would like to have solar assistance, so efficiency of components would be somewhat important. I realize that there is some money involved on the front end, but it still seems cheaper(and simpler, and easier to maintain) than a furnace, & a water heater combination. Plus space is at such a premium in a 13' Burro! Heat is my primary motive here. The hot water is secondary, but a nice benefit. Is this system doable?
Do any of you have any experience with this type of heating system that you could share?

Thanks
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Old 11-17-2005, 07:31 PM   #2
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I think that is something to really look at
http://www.solarhaven.org/HPArticle.htm
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Old 11-17-2005, 09:21 PM   #3
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I have been very interested in this as well. There have been significant advances in low power consumption fans and pumps since this article was written. The thing that was not clear to me was how the heater interfaced with the existing plumbing for sink/shower use or if it was a dedicated unit. I did write to the author back in August and never got a response.

Based on the drawing I figured I could construct the heating loop with a transmission cooler and a 12 volt PC muffin fan.
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Old 11-17-2005, 09:23 PM   #4
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If I have seen this right,I would say lines go to and from water heater and water is circulated back and forth.If you don't want heat turn pump and fan off.
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Old 11-17-2005, 10:45 PM   #5
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The water heater I was considering has a heat exchanger. Typically this is used to heat the water going down the road in an RV. In this case, you are drawing the heat out, not putting it in the tank. This is totally backwards from what the water heater, with the heat exchanger, is originally intended I would think one would want to shut off the water to the heater core completely during the summer, so provisions would have to be made for this. With a heat exchanger, I would think there would be four pipes on the water heater itself, two for water in & out, & two for heat exchanger in & out. I'm only guessing here.
The pump mentioned in the article I found on the net for $289.00. I think I could get by with less pump.(Actually I know I will. That's too pricey!) I think a 12V muffin fan will work just fine, especially in a 13.

Thanks for the feedback.
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Old 11-17-2005, 10:59 PM   #6
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I already have a Muffin PAN..

Do I need a FAN too?

I have been in many houses with this type of heating, and one of my neighbors even installed a similar system in his driveway to reduce shoveling in the winter.

BUT, how much weight does this add and can a 13 handle it? I realize you would probably drain when under way.

Just bake some muffins when you are cold.. this'll kill several birds with one pan, er, fan..

og geez.. I give up.
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Old 11-18-2005, 12:58 PM   #7
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The sytem is quite easily built for anyone with a HOH heater. Things to be careful with! Heat exchanger needs to be stainless or non/lead soldered. The quality of hoh can cause corrosion problems. Also if it's a potable hoh source keeping it lead free is paramount in importance. Happy scrounging. Oh a possibility for a small heat exchanger could be the intercooler from a turbocharged engine.

T
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Old 11-18-2005, 01:08 PM   #8
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Whats " HOH heaters" mean?
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Old 11-18-2005, 01:39 PM   #9
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Quote:
Originally posted by Chester Taje@Nov 18 2005, 07:08 PM
Whats " HOH heaters" mean?
If it had two "O"'s and one "H" it would be a H2O water heater. I think in this instance he was refering to a heavy water heater, something the Germans were working on at the end of world war 2.
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Old 11-18-2005, 01:41 PM   #10
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Thanks alot
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Old 11-18-2005, 02:22 PM   #11
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I like the looks of this set up, especially getting rid of the noise of the current furnace fan. Another advantage, it can be mounted in a much smaller space, can be configured to many different space set ups.

In the Casita, I could go back to a full cupboard under the sink, and fit a unit such as this in the almost useless cupboard under the rearmost seat of the side dinette. It would also move some weight from the heavy side of the trailer to the light side. I wonder if temperature control could be obtained by putting a thermostat in line to the fan, and maybe a Hi-Lo-Off switch on the pump to increase/decrease water volume based upon severity of exterior chill.


Steve; how about some of your "Castle Pretentious" Engineering thoughts on this one!

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Old 11-18-2005, 03:11 PM   #12
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Quote:
Originally posted by drew l.+Nov 18 2005, 12:39 PM-->
Quote:
<!--QuoteBegin-Chester Taje
Quote:
@Nov 18 2005, 07:08 PM
[b] Whats " HOH heaters" mean?
If it had two "O"'s and one "H" it would be a H2O water heater. I think in this instance he was refering to a heavy water heater, something the Germans were working on at the end of world war 2.
I always thought H2O was 2 H's and one O's.
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Old 11-18-2005, 03:12 PM   #13
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Quote:
Whats " HOH heaters" mean?
Oh Oh Oh.. my tongue is bleeding..

I'll let Roger get in trouble instead...
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Old 11-18-2005, 03:59 PM   #14
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Regarding HOH and H2O...

While both indicate two "H" (hydrogen) and one "O" (oxygen) - and mean water - the much more common H2O form only indicates the number of each type of atom, while the HOH notation means an "H" and an "OH" group, so it provides some indication of molecular structure. This is very commonly done with complex organic (containing hyrdrogen and carbon) compounds, since two molecules with the same atomic counts could have quite different structures, and thus quite different characteristics.

Both are distinct from the HO HO heater, which keeps Santa's feet warm in the sleigh.

I'll shut up now...
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