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[RSI]

Just going by measurements of HX is guesswork, need specs, is it like this? Just guessing by cost and dimension.
http://www.altheatsupply.com/shop-by-needs/heat-exchanger/pool-heat-exchangers/stainless-steal-tube-and-shell-heat-exchanger-350k-btu.html

It looks kinda like that.  Its copper though, inner piping and outer. Has female bungs on the top, bottom, and two on the side, one towards the top and the other towards the bottom. I will work on getting up some pictures tonight so you guys can see what I'm dealing with. Im still beside myself at what I was charged buy the dealer for my hx. Thanks again for the continued help.

The size and being copper explains why it cost so much. I wonder if he had a reason to sell that instead of a plate.

[MrUPS]

yeah I'm wondering the same thing. I could have gotten one heck of a plate style hx for that money    I'm gonna call on Monday and share my "concern" with there choice and price!

[MrUPS]

Ok, So I finally got a pic. If I understand correctly. In order to fix my multiple problems, what I need is. A larger pump at the OWB, a circulating loop with a pump at the boiler and I need to get the hx on the cold side instead of the hot side  . Does it sound like I'm on the right track here? Do you guys see anything in the pic that looks off?  I called today about the price of the hx and I was told "thats the price" I asked why they use that style and not a plate style. Was told that the plate style require more maintenance and cleaning. Not sure I'm buying that one but it is what it is and I'm stuck with what I got. LESSON LEARNED! Thanks again for all the help guys. I really appreciate it.

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[RSI]

What size are the internal tubes in the heat exchanger?

Sound like a good plan you have. Should make a huge difference.

[Scott7m]

Can someone explain to me where this extra pump is going and what it's going to be doing?  I'm confused

[RSI]

Can someone explain to me where this extra pump is going and what it's going to be doing?  I'm confused

I think he plans on having it circulate the water from the indoor boiler through heat exchanger to keep the indoor boiler hot. Otherwise it will cool down when the house isn't calling for heat. Then when the house does call for heat it would start pumping the cold water out of the indoor boiler through the house as it re-heats the boiler.
It might work fairly well without the pump but it would depend on how much the indoor boiler cools down when the indoor pumps are off.

If adding the extra pump, I would control it with an aquastat. No reason to have it run 24/7.

[Scott7m]

Yea a ranco would work well on that, I assumed the other boiler already had a pump running through it all the time.  It would def work much much better circulating that water through it

[MrUPS]

Scott this is my plan with the circulating pump.  http://www.centralboiler.com/Tech/C220.pdf  I'm hoping that by circulating the water through the hx and into the boiler 24/7 than when the house calls for heat the boiler will just kick on the house circulating pump and not fire the propane. I'm not sure what a ranco is though....is that a type of pump? I have have a taco 007 on the OWS now, I now know that is to small so I could use that as the pump or I have two Groundfos UPS 15 58 fc. I could use one of those??

RSI I'm not sure how using the aquastat is going to work? I'm not doubting your suggestion. I just need it explained to me.  Wouldn't the aquastat let the water in the boiler cool down thus kicking on the propane to heat the water in the boiler? Also I didn't look real close at the tubes in the hx but I would say they are about the size of a pencil and there where 10 or so of them in there.

intheoaks I dont know enough about this stuff to say for sure whats better or worse but for the money I payed for this over sized piece of copper it had better work!  If I could do it over I would have got a plate style but were past that...

You guys are awesome. Thanks again 

[Scott7m]

You could use the 007 to circulate through the plate, a ranco is an aquastat.  It's basically a switch control by temp, for example if your boiler temp was 175, you could set it so that "that" particular pump would t run til it cooled down to a certain degree.

One of those 15-58 would be better on the stove than the 007 but still a bit small i think

[MrUPS]

I was thinking the same thing about the 15-58. I think I might put it on the OWS just to see how much difference it makes. I should run it on high I assume? Still have the other "big" problems to fix too. I'll have to look into the aquastat. I think I understand whats going on there but I wouldn't know were to hook up the thermostat wires (i'm assuming thats what gets hooked to it) My very steep learning curve continues. haha.

[Scott7m]

The ranco would or could use it as a strap on, sensor would strap onto a pipe.  The wires from the pump could go into the ranco, to be powered on and off

[Bondo]

I'm not sure how using the aquastat is going to work? I'm not doubting your suggestion. I just need it explained to me.   Wouldn't the aquastat let the water in the boiler cool down thus kicking on the propane to heat the water in the boiler?

Ayuh,....   If there's another port in the propane boiler, you could put an aqua-stat in it to control the H/E pump...
The pump would be the only thing hooked to the aqua-stat...
When the boiler drops below yer set-point, the pump would come on, reheatin' the boiler to the high set-point, then shut off, til the propane boiler calls for heat again...

The propane fire controls will need to be set lower, or by-passed...