# TLUD Water Heater
**URL:** http://forum.driveonwood.com/t/tlud-water-heater/7793
**Category:** Homesteading
**Created:** [April 15, 2024, 3:46pm UTC](http://forum.driveonwood.com/t/tlud-water-heater/7793 "2024-04-15T15:46:42Z")
**Posts on this page:** 20
**Page:** 1
### Author:  [@FruitvaleFarmer](http://forum.driveonwood.com/u/FruitvaleFarmer)
#### Post date: [April 15, 2024, 3:46pm UTC](http://forum.driveonwood.com/t/tlud-water-heater/7793/1 "2024-04-15T15:46:42Z")
I’d like to make a water heater using a TLUD heat source, with an old propane tank for the water. Do any of you have experience with water in propane tanks? Am I setting up to produce rust? Is there a paint or coating that would stop the rust but be drinking water safe?
Thanks in advance . . .
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### Author:  [@Pelletpower](http://forum.driveonwood.com/u/Pelletpower)
#### Post date: [April 15, 2024, 7:57pm UTC](http://forum.driveonwood.com/t/tlud-water-heater/7793/2 "2024-04-15T19:57:44Z")
If you gonna use it for drinking water there are two options in my opinion, stainless or emaile.
Next to keep the rust away, make sure oxigen cant enter, so closed system. Be carefull about the safety features, but I dont have to teach you that 😀. You are a clever guy.
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### Author:  [@mart85](http://forum.driveonwood.com/u/mart85)
#### Post date: [April 15, 2024, 8:16pm UTC](http://forum.driveonwood.com/t/tlud-water-heater/7793/3 "2024-04-15T20:16:29Z")
Depends on what scale you are doing. Kelly Kettle for heating water are very hard to beat.
[ ](https://www.youtube.com/watch?v=p_FTXBkK4lo)
But I use a DIY Solo stove myself. All depends on the volume of water you want to heat.
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### Author:  [@ForbiddenTuna](http://forum.driveonwood.com/u/ForbiddenTuna)
#### Post date: [April 15, 2024, 9:15pm UTC](http://forum.driveonwood.com/t/tlud-water-heater/7793/4 "2024-04-15T21:15:19Z")
Propane tanks have a lining to add that rotten egg smell, so I’m assuming it would also do that to any water inside the tank.
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### Author:  [@madflower69](http://forum.driveonwood.com/u/madflower69)
#### Post date: [April 15, 2024, 10:23pm UTC](http://forum.driveonwood.com/t/tlud-water-heater/7793/5 "2024-04-15T22:23:09Z")
You shouldn’t drink hot water anyway. The main reason is it dissolves chemicals especially lead faster. Propane tanks rust out. And the bacteria that produce the sulfur smell in water that feed off iron are anaerobic.
I would use a heat exchanger to keep the water separate if you are going to use a hot water tank. namely to keep the water separate but also because the heater isn’t going to be running the -whole- time, and the circulating pump can be shut off when not needed.
ALSO be VERY careful, the water can get too hot and cause scalding.
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### Author:  [@r\_wesseling](http://forum.driveonwood.com/u/r_wesseling)
#### Post date: [April 15, 2024, 10:31pm UTC](http://forum.driveonwood.com/t/tlud-water-heater/7793/6 "2024-04-15T22:31:29Z")
Hi Kent,
I would suggest you find an old gas fired hot water heater, ‘b-vent’ type, on craigslist. They usually have some on there for free. You could keep the insulation in place if appropriate. They have a pipe up their center where heat is actually transferred. Inside the the center pipe there is usually a twisted piece of metal, called a spinner, that increases heat transfer. Most of them have a sacrificial zinc anode that reduces corrosion. They also have a safety valve, which is VERY important.
Rindert
Example listing:
> **[Scrappers water heater & empty keg - free stuff - craigslist](https://denver.craigslist.org/zip/d/denver-scrappers-water-heater-empty-keg/7736916693.html)**
>
> hot water heater Keg shell is gone Sitting at side of house No need to contact just come get. Thanks. I will delete ad when gone. 2973 S. Oneida st Denver 80224
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### Author:  [@tcholton717](http://forum.driveonwood.com/u/tcholton717)
#### Post date: [April 15, 2024, 10:55pm UTC](http://forum.driveonwood.com/t/tlud-water-heater/7793/7 "2024-04-15T22:55:02Z")
I have two different tanks for my hot water floors. One for the upstairs and one for the downstairs. One is a large oxygen tank and the other is a hundred pound propane tank. I wouldn’t drink the water running through them but I have been storing hot water in them for 22 years now. I drain them when the heating season is over and the water is a little rusty. I’m sure it’s a race to see which of us bites it first and I’m sure that if it’s the tanks it will be in January. If I were a betting man I’d bet that the tanks will outlast me. Of course the tanks themselves are not exposed to high heat like you would get in a TLUD. The water is heated in pipe grids and thermosyphons up to the tanks.
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### Author:  [@FruitvaleFarmer](http://forum.driveonwood.com/u/FruitvaleFarmer)
#### Post date: [April 16, 2024, 10:33pm UTC](http://forum.driveonwood.com/t/tlud-water-heater/7793/8 "2024-04-16T22:33:04Z")
Thank you all for the ideas and cautions. In order of appearance:
> [@Pelletpower](#):
>
> If you gonna use it for drinking water there are two options in my opinion, stainless or emaile.
Stainless would be great; what’s emaile?
> [@mart85](#):
>
> Depends on what scale you are doing. Kelly Kettle for heating water are very hard to beat.
Kelly Kettles I really like, for water I’d actually drink. When I said “drinking water,” I probably should have said “bathing water.” It should be clean enough not to be a health risk when washing. The goal is a small, wood-fired shower for use when the power’s out, or too expensive.
> [@ForbiddenTuna](#):
>
> Propane tanks have a lining to add that rotten egg smell, so I’m assuming it would also do that to any water inside the tank.
Good thing to consider. I thought the odor was in the propane. I’ll have to check that out.
> [@madflower69](#):
>
> You shouldn’t drink hot water anyway. The main reason is it dissolves chemicals especially lead faster. Propane tanks rust out. And the bacteria that produce the sulfur smell in water that feed off iron are anaerobic.
>
> ALSO be VERY careful, the water can get too hot and cause scalding.
Yeah, probably no drinking, but maybe bathing. One benefit of a TLUD is batch operation. I hope to use a measured fuel amount to raise the temperature of the water a proportional amount. Well below boiling is fine, but maybe hot enough to require some additional cold water to raise the total volume for a longer shower 🙂
I have an inexpensive, small 12 volt “sprayer” pump, not made in USA, that I plan to try. The tank will be open to atmosphere, so no steam explosions.
> [@r\_wesseling](#):
>
> Hi Kent,
> I would suggest you find an old gas fired hot water heater, ‘b-vent’ type, on craigslist.
Good idea. I looked a little on craigslist a while back, but not very consistently. They tend to be scarce here is the land of cheap hydropower. No natural gas here with the lower population density, and propane winds up more expensive I think. I’ve salvaged a bunch of “barbeque” tanks for gasifiers (and a kettle corn cooker), so that’s why I asked the question.
> [@tcholton717](#):
>
> I wouldn’t drink the water running through them but I have been storing hot water in them for 22 years now.
Aha! An encouraging word. Thanks, Tom. I think I’ll give it a try when time allows, and if it fails, the cost is small compared to the education.
Thanks again, everyone!
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### Author:  [@MikeR](http://forum.driveonwood.com/u/MikeR)
#### Post date: [April 16, 2024, 11:22pm UTC](http://forum.driveonwood.com/t/tlud-water-heater/7793/9 "2024-04-16T23:22:53Z")
Hi, Kent! I was just thinking about this water heating subject, and I remembered our own Dan H did this years ago. Here is a link to the video he posted. the description of the video on YouTube has some details of the build.
[Wood fired domestic hot water heater]
[ ](https://www.youtube.com/watch?v=RDdTYFw_evY)
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### Author:  [@FruitvaleFarmer](http://forum.driveonwood.com/u/FruitvaleFarmer)
#### Post date: [April 17, 2024, 12:05am UTC](http://forum.driveonwood.com/t/tlud-water-heater/7793/10 "2024-04-17T00:05:50Z")
Thanks, Mike (and @dynamodan). That’s what I’d like long term. Our current water heater (electric) is between the attached garage and kitchen, near the center of the house. Fine with electricity, not not convenient for wood with the need for air and a stove pipe. I may, someday, try something more serious like Dan’s just outside the house as a preheater, and connect it to the existing system with pex. Not today, probably not tomorrow, but someday, maybe 🙂
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### Author:  [@JohanM](http://forum.driveonwood.com/u/JohanM)
#### Post date: [April 17, 2024, 5:41am UTC](http://forum.driveonwood.com/t/tlud-water-heater/7793/11 "2024-04-17T05:41:57Z")
> [@FruitvaleFarmer](#):
>
> Stainless would be great; what’s emaile?
I believe emalie is enamel.
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### Author:  [@FruitvaleFarmer](http://forum.driveonwood.com/u/FruitvaleFarmer)
#### Post date: [April 17, 2024, 6:43pm UTC](http://forum.driveonwood.com/t/tlud-water-heater/7793/12 "2024-04-17T18:43:25Z")
> [@JohanM](#):
>
> I believe emalie is enamel.
Like a fired-on enamel? I think that would be great, but I think it’s probably beyond my skills.
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### Author:  [@JohanM](http://forum.driveonwood.com/u/JohanM)
#### Post date: [April 17, 2024, 7:10pm UTC](http://forum.driveonwood.com/t/tlud-water-heater/7793/13 "2024-04-17T19:10:42Z")
Yes, fire-on enamel. @Pelletpower Joep can chime in in case he meant something else.
I think you would have to be incredibly lucky to find an enameled tank in the size you need
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### Author:  [@Pelletpower](http://forum.driveonwood.com/u/Pelletpower)
#### Post date: [April 17, 2024, 7:44pm UTC](http://forum.driveonwood.com/t/tlud-water-heater/7793/14 "2024-04-17T19:44:15Z")
Thanks Johan, yes.
But I dont know what Kents plans are with the water, heating the house or taking a shower?
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### Author:  [@FruitvaleFarmer](http://forum.driveonwood.com/u/FruitvaleFarmer)
#### Post date: [April 17, 2024, 7:47pm UTC](http://forum.driveonwood.com/t/tlud-water-heater/7793/15 "2024-04-17T19:47:25Z")
> [@Pelletpower](#):
>
> But I dont know what Kents plans are with the water, heating the house or taking a shower?
Finally a question I can answer: taking a shower 🙂
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### Author:  [@Pelletpower](http://forum.driveonwood.com/u/Pelletpower)
#### Post date: [April 17, 2024, 9:08pm UTC](http://forum.driveonwood.com/t/tlud-water-heater/7793/16 "2024-04-17T21:08:55Z")
Take solar tubing in the watertank. The pipe is stainless and affordable, has a big surface etc etc. And you can make you tank from whatever material you want. Just an idea.
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### Author:  [@KristijanL](http://forum.driveonwood.com/u/KristijanL)
#### Post date: [April 20, 2024, 5:34am UTC](http://forum.driveonwood.com/t/tlud-water-heater/7793/17 "2024-04-20T05:34:05Z")
Kent, l got mine custom made. The builder presented me with a couple of options. Food grade paint like coating, stainless… from experiances l know l dont trust paint, and stainless is prone to cracking after some heat cycles. Then he came up with a near forgoten technick in the boiler world, zinc plating. Im super pleased with it. Been in dayly use for 3 years now and not long ago l opened it, its like new inside.
Also no scale, the water never gets above 70c and the heating flue is large area/low temp so its as clean as new. Highly recomend.
Edit: its cheap too. Last time l remember was around 1€ per kilo of material.
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### Author:  [@FruitvaleFarmer](http://forum.driveonwood.com/u/FruitvaleFarmer)
#### Post date: [April 21, 2024, 9:04pm UTC](http://forum.driveonwood.com/t/tlud-water-heater/7793/18 "2024-04-21T21:04:23Z")
Thank you Kristijan. I suspect your tank is hot dipped galvanized. That’s probably beyond my ability, but I might be able to electroplate with zinc.
My son had a good suggestion I might try first: a TLUD flash heater. We need to think of a way to regulate the maximum temperature so we don’t build a flash boiler 🙂
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### Author:  [@FruitvaleFarmer](http://forum.driveonwood.com/u/FruitvaleFarmer)
#### Post date: [May 16, 2024, 9:42pm UTC](http://forum.driveonwood.com/t/tlud-water-heater/7793/19 "2024-05-16T21:42:20Z")
Here’s a book (the second half) that talks about water heating, including a simple tank heater similar to what I had in mind, and also a Rocket Stove flash heater. The latter includes full disclosure about other members of the group scorning the “bomb.”
[http://aprovecho.org/?paybox\_id=74](http://aprovecho.org/?paybox_id=74)
The first half of the book has a lot of good ideas about stoves and ovens:
[http://aprovecho.org/?paybox\_id=73](http://aprovecho.org/?paybox_id=73)
and an earlier book talks about simple cooking devices:
[http://aprovecho.org/?paybox\_id=75](http://aprovecho.org/?paybox_id=75)
These are from Aprovecho Research Center, and much of it is Dr. Larry Winiarski’s legacy.
More publications and info here:
[http://aprovecho.org/publications-3/#books](http://aprovecho.org/publications-3/#books)
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### Author:  [@tcholton717](http://forum.driveonwood.com/u/tcholton717)
#### Post date: [May 16, 2024, 10:35pm UTC](http://forum.driveonwood.com/t/tlud-water-heater/7793/20 "2024-05-16T22:35:51Z")
I used to be in contact with some homesteaders that were making parabolic solar water heaters. The were simple, using 12 in duct cut in half and lined with reflective mylar. Water ran through a copper pipe in the center of the collector. Depending on how many collectors they daisy chained they could get boiling temp water out of them. Of course sun was a necessary component. I have over 300 feet of water hose running from my house down to my garden. 80 per cent of it runs though the woods but even laying on the ground for a half hour it picks up enough heat to feel like probably 110F. before the fresh cold pushes it all out. I’ll try and remember to take my RF thermometer down and check it.