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Author Topic: heat exchanger size  (Read 3348 times)

cjf12

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heat exchanger size
« on: April 03, 2014, 06:02:00 PM »
I have a model 200 Mahoning with what ever size HX they sent with it. I believe a 10 plate.  If someone knows what was standard let me know.  Right now I am using a hot water tank in the house and recirculating it to get up to temp and storing since the hot plate wont keep up with hot water.  I am thinking of ditching the tank since it is starting to leak and was wondering what size HX I ought to get.  I have my furnace about 140 feet away from the house so I am sure there is some heat loss.  I'm struggling to think a 20 plate will do it seeing how poorly a 10 plate does, but would a 50 plate be overkill?
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Scott7m

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Re: heat exchanger size
« Reply #1 on: April 03, 2014, 06:11:54 PM »
Sounds like u have a terrible flow problem

Years ago all I installed was 10 plates for domestic water but I had to accommodate for the restrictive need of the unit by increasing flow via a larger pump

Now we install all 20 plates for domestic hot water and we Def don't recirculation through them, they make endless hot water very easily
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cjf12

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Re: heat exchanger size
« Reply #2 on: April 05, 2014, 05:12:38 PM »
Scott, curious as to what size pump your putting on the furnace.  Mine is a 007 TACO.  3/4" plumbing although the hx has 1" ports.  Would changing these alone help?
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RSI

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Re: heat exchanger size
« Reply #3 on: April 05, 2014, 07:33:19 PM »
You have 3/4" pex too? How many feet total? That 007 is undersized for sure with a 10 plate even if the overall pipe length is short.

Turn on a hot water faucet and then feel the boiler line out of the heat exchanger. I am guessing it is not very hot if even very warm.
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