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Old 12-02-2019, 09:01 AM   #1
Mini-Skoolie
 
Join Date: Jun 2017
Location: Fort Lauderdale, FL
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Year: 2002
Coachwork: AmTran 11 Window
Chassis: IHC
Engine: DT466e
Radiant Hydronic Heating and More

More... the whole plumbing system actually. Currently it exists only on paper and before I birth it into the world, I'm hoping for some constructive criticism from those who have actually constructed.

Plans are for fully integrated system, sans black tank.
-100 gal fresh tank, 70 gal grey (the biggest I could fit in basement)
-Dual tankless heaters, elec for on-grid, propane for off-grid
-Radiant in-floor hyrdonic heating
The rest seems to be standard skoolie fare...

The radiant heating gives me the most pause. Has anyone done this with a tankless heater? Can I use a branch off the fresh water, or do I need a separate closed system with a heat exchanger?

I am a complete novice with plumbing... I've attached a diagram of my best attempt, but hoping someone more knowledgeable can pick it apart. Many thanks in advance!
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File Type: jpg Plumbing Diagram v1.0.JPG (71.6 KB, 25 views)
paulnack is offline   Reply With Quote
Old 12-23-2019, 11:32 AM   #2
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Location: Western PA (Outside of Pittsburgh)
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I'm a noob on Skoolie Conversions, but looking at your drawing, I have a concern. For your radiant heating system, you need a couple of things to make sure that you don't build up pressure in the closed loop system.
1. Small expansion tank teed off of the lines running to your hydronic system. This will allow expansion of the hot water in and contraction of the cold water in the system.
2. A pressure relief valve. If, for some reason, the pressure gets too high in your system, this valve allows controlled release of water.


Since you already are thinking 2 water heaters, why don't you just do 2 LP heaters. One for the heating system and one for the hot water system to keep things separate.


Mike in Pittsburgh, PA
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Old 12-23-2019, 01:02 PM   #3
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The floor system should be a self contained loop and not tied into the house water system. I have separate tankless heaters for both. Were you talking about having to tanks, one electric and one propane? You lost me there, don't know of any combo units like that. Why would the propane one not be sufficient for all use.
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Old 12-25-2019, 09:36 PM   #4
Mini-Skoolie
 
Join Date: Jun 2017
Location: Fort Lauderdale, FL
Posts: 40
Year: 2002
Coachwork: AmTran 11 Window
Chassis: IHC
Engine: DT466e
Quote:
Originally Posted by Hengy View Post
I'm a noob on Skoolie Conversions, but looking at your drawing, I have a concern. For your radiant heating system, you need a couple of things to make sure that you don't build up pressure in the closed loop system.
1. Small expansion tank teed off of the lines running to your hydronic system. This will allow expansion of the hot water in and contraction of the cold water in the system.
2. A pressure relief valve. If, for some reason, the pressure gets too high in your system, this valve allows controlled release of water.
Since you already are thinking 2 water heaters, why don't you just do 2 LP heaters. One for the heating system and one for the hot water system to keep things separate.
Mike in Pittsburgh, PA
Good point, pressure increase is proportional to temperature increase. So an expansion valve/tank will be necessary. Thank you for bringing this to my attention.
The reason for dual heaters it to be able to use the 2 energy sources. Electric when I'm hooked up at a campsite, propane when I'm off grid. Electric water heating to too energy hungry to do with batteries. And I want to be able to park somewhere for extended periods without chugging through propane bottles and having to run for refills.

Quote:
Originally Posted by o1marc View Post
The floor system should be a self contained loop and not tied into the house water system. I have separate tankless heaters for both. Were you talking about having to tanks, one electric and one propane? You lost me there, don't know of any combo units like that. Why would the propane one not be sufficient for all use.
Hey, see the paragraph above about the dual energy source. I wasnt thinking a single "dual-fuel" unit, but rather 2 tankless units (havent decided series or parallel). Although I would love one if it exists.
Can you please explain why I can't branch the radiant system off the house water? I've read this elsewhere, but haven't seen reasoning why not.
How has your experience been running the radiant off a tankless? I've read that the often off/on operation of maintaining the constant temp will drastically reduce a tankless heaters lifespan. Most units aren't warrantied for this type of use for that reason.
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