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Tool Talk Discussion Forum

Sidearm heat exchanger

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FarmerSid

10-03-2006 05:18:26




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Hey All! Wondering if any of you smart folks have built one of these things. I want to build one to put on my hot water tank to ease the hydro consumption during the heating season. I want to run it off my wood furnace.

Anybody got any idea's?

Cheers!

Sid




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John in B-ton

10-05-2006 12:35:13




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 Re: Sidearm heat exchanger in reply to FarmerSid, 10-03-2006 05:18:26  
check out otherpower.com; on their discussion board there is a search feature to search the website. type in heat exchanger and you will see some homemade items that seem simple and effective.

as another post mentioned allow for high temps and high pressure in any hot water system by installing the proper pressure relief valve.



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Butch(OH)

10-04-2006 15:21:21




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 Side arm picture in reply to FarmerSid, 10-03-2006 05:18:26  
third party image

If it works this is a pic of my side arm and valving. The inflow from the boiler comes in at top just left of center in the pic. Then goes to the side arm then out of the picture to the left to the heat exchanger in the furnace. As you can see with all the by pass valves, unions and pipe it is costly. I think the 1" valves were like $10 each. The non insulated vertical pipe in front of the water heater is the boiler fill. Al of this had to be insulated as it was bringing up my house temps about 15 degrees, LOL.

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FarmerSid

10-05-2006 04:25:18




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 Re: Side arm picture in reply to Butch(OH), 10-04-2006 15:21:21  
Hey Butch. Would you mind e-mailing me that picture and anymore you might have? It's a little hard to see things in the one you posted as it's a little small. My e-mail is [email protected]

Cheers!

Sid



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mjbrown

10-03-2006 10:46:47




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 Re: Sidearm heat exchanger in reply to FarmerSid, 10-03-2006 05:18:26  
Making something that will get the water hot is one thing. Making it so it will stop and not make steam is another.



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Bob

10-03-2006 05:25:49




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 Re: Sidearm heat exchanger in reply to FarmerSid, 10-03-2006 05:18:26  
Those are pretty basic... a small diameter copper pipe inside a larger diameter copper pipe.

The small pipe is brought out through reduced-down "tee's" at top and bottom.



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FarmerSid

10-04-2006 04:45:00




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 Re: Sidearm heat exchanger in reply to Bob, 10-03-2006 05:25:49  
Bob. They may be pretty basic and I kinda understand how they are made but wondering if anybody had some plans or would describe in detail how they made there's.

Cheers!

Sid



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Butch(OH)

10-04-2006 05:52:55




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 Re: Sidearm heat exchanger in reply to FarmerSid, 10-04-2006 04:45:00  
Sid, here is a link that shows the basic plumbing and design. The one I have is a 1" tube inside of a 2". I bought mine from my stove dealer for like $90 which is darned little over the cost of materials. Idealy it should have a by-pass circuit and have unions and valves on both the boiler and domestic circuits so it can be removed for cleaning without cutting everything apart and that adds considerably to the cost of installing one with the price of copper these days. The special 2x1x1 tees for the exchanger are like $32 EACH from any source I checked. If you just plumb it solid with no by-pass valves and unions the cost comes down quite a bit. To each his own but I didnt want to have to shut down both my boiler and domestic water systems if a leak or other problem occured. Mine has been in use about a month and only in a time of very high demand, like showers and washer running does the gas burner kick on.

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Butch(OH)

10-04-2006 05:57:50




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 Re: Sidearm heat exchanger in reply to Butch(OH), 10-04-2006 05:52:55  
Oh yea, dont even think about installing a side arm with out including a mixing valve to temper your domestic hot water temp. Without it your domestic water will be boiler temp. This adds another $100 if you get the one that works well.



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FarmerSid

10-04-2006 07:11:58




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 Re: Sidearm heat exchanger in reply to Butch(OH), 10-04-2006 05:57:50  
Thanks Butch. I did run across the free heat machine web page. It's hard to find info on this stuff. I agree with the mixing valve.

Cheers!

Sid



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