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Author Topic: Optimizing a side arm  (Read 3835 times)

Uponthehill

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Optimizing a side arm
« on: October 01, 2014, 03:55:20 PM »
I am going to make my own sidearm to custom fit my DWH.  is there an optimal size for the two pieces of copper ?   My length will be approx. 4 1/2 feet.
Thanks in advance for your replies...
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Uponthehill

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Re: Optimizing a side arm
« Reply #1 on: October 12, 2014, 05:48:36 AM »
Anybody ?   I'm going with 2" x 1 1/4" x 3/4 T's. The way I understand is to hit the DWH first @ the bottom of DWH, flowing upwards to the remaining loops then returning to the boiler.  Is this correct?
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free heat

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Re: Optimizing a side arm
« Reply #2 on: October 13, 2014, 05:31:27 PM »
That's the way mine is plumbed, going to the bottom of the side arm first then up the side arm then to the heat exchanger in the furnace. The correct way to plumb the side arm is a grey area. Many people have it entering the top of the side arm. My cousin is a journeyman in plumbing and hvac and he said to have it enter from the bottom. I know many people feel this is the wrong way but mine works awesome 
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Uponthehill

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Re: Optimizing a side arm
« Reply #3 on: October 13, 2014, 08:01:10 PM »
Thank you free heat. I'll do a little more research to decide which way to do mine.
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LittleJohn

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Re: Optimizing a side arm
« Reply #4 on: October 14, 2014, 06:38:41 AM »
UPONTHEHILL

When I made mine, I used a 3/4" copper pipe up the middle and a 1 1/4" copper pipe around it.  That way I was no restricting the flow on the loop of the OWB (used closely spaced tees to pull heat off of primary loop from OWB to house).  No complaints yet, other than I have to turn down the thermostatic mix valve between the hot water heater and the fixtures, that first bath after the OWB was fired up was a bit toasty
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