using water coil on hitzer 50-93 to heat outdoor hot tub?

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Outdoort
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Post by Outdoort » Wed. Oct. 07, 2020 9:35 am

Just as the title states, anyone doing this? My idea is to plum the pipes from the stove to a outdoor stock tank as a hot tub and keep it heated all winter (heating so long as the stove is on, since you probably want to keep the water flowing through these devises while the stove is running).

I was looking at home made stock tank hot tubs online and I want to build one! Google them if your not farmiliar.

Not really asking if this can be done, I already know it would work for a smaller stock tank, just kinda wondering what size stock tank would fit the capacity for a water coil in a hitzer 50-93? The stock tank will be outside and not insulated so I just dont want to purchase a stock tank too large where the stove and coil cant suficiently keep it heated... Would love to hear of someone with a similar setup, but please give me some input!

What might be helpful for me is to tell me how many gallons hot water heater your stove coil solely heats on its own. The stock tanks I'm looking at are in the area of 150-350 gallons.

-Tyler.

 
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StokerDon
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Post by StokerDon » Wed. Oct. 07, 2020 10:11 am

Welcome to the forum,

First off, I am not sure what a "stock tank" is but it is probably some sort of water storage tank. Here are a couple things to keep in mind while embarking on one of these projects.

1) If your heating loop will be a closed system you need to include a pressure relief valve and an expansion tank. These will prevent your heating loop from exploding.

2) If your heating loop will be an open system you will need to come up with ways to limit corrosion.

3) Stove heating coils have a very small amount of surface area to collect heat. This means that the amount of gallons per minute that can be heated is also very small so recovery time is long.

Good Luck!
-Don

 
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Lightning
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Post by Lightning » Wed. Oct. 07, 2020 11:11 am

Yeah, so I kept my 400 gallon hot tub warm this way when I ran a hand fed coal furnace.. I used a stainless steel coil and pex lines.. do not use copper. It kept my tub in the 90's, sometimes warmer when I pushed the stove hard. Keep in mind that a hot tub is insulated like a Thermos or better and there is some heating from the filtering pump.

You will need to insulate that tank somehow and have an insulated lid.... and I would advise using two or three of the biggest coils that will fit in your stove, plumbed in series with a small circulator.

 
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Lightning
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Post by Lightning » Wed. Oct. 07, 2020 11:25 am

If you don't insulate the tub and don't have an insulated lid, the best you'll do is keep the water from freezing...
Last edited by Lightning on Wed. Oct. 07, 2020 2:51 pm, edited 1 time in total.


 
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freetown fred
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Post by freetown fred » Wed. Oct. 07, 2020 11:29 am

U, I got a 150 gall. tank & I doubt if it would even be worth it for that size. Hell, if I set up a hot tub I'd want to be able to at least be able to get Momma in there with me!!!! LOL

 
Outdoort
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Post by Outdoort » Wed. Oct. 07, 2020 6:50 pm

Freetown fred, I just need it for me and my woman, and I like to keep her close lol. But alright, I can insulate this thing, even beneth. Let me see if I can post a pic of what I'm talking about. I'l see if I can post a smaller one and also of a larger stock tank to show what I'm talking about.

 
Outdoort
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Post by Outdoort » Wed. Oct. 07, 2020 6:53 pm

accidental post. see below.
Last edited by Outdoort on Wed. Oct. 07, 2020 6:57 pm, edited 1 time in total.

 
Outdoort
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Post by Outdoort » Wed. Oct. 07, 2020 6:56 pm



 
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freetown fred
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Post by freetown fred » Wed. Oct. 07, 2020 7:15 pm

The links worked O. :)

 
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Lightning
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Post by Lightning » Wed. Oct. 07, 2020 7:41 pm

It's a trial and error deal.. you might do all that work and spend money on coils just to find out they can't absorb enough heat to keep it warm enough.. no guarantees it will work.. The more coils you get into the stove, the better the results will be.

But best of luck if you decide to pursue it. :D

 
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Post by DENNIS BAUER » Fri. Oct. 09, 2020 11:41 am

I'm very interested in this idea. I run a 50-93 in my garage and could do this and keep it in the garage where it isn't perfectly insulated but better then being outside.
What do you guys/gals think would happen to a coil that is in the stove with no water to it if i don't have it set up for a while? damage to the coil? I'd leave the ends open the so no pressure could be built up.

 
Outdoort
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Post by Outdoort » Wed. Oct. 14, 2020 10:22 am

I'm kinda thinking nothing, its stainless steel. My guess is that they want water constantly circulating to avoid any possibility at all at creating steam and pressure....

 
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Post by carlherrnstein » Fri. Oct. 16, 2020 5:18 pm

If you are buying the coil then ask the manufacturer. If you are making the coil find the maximum temperature rated on the tube/pipe.

My guess is not much of anything could happen. Obviously if it is kept glowing red for hours on end if could be ruined.

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