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Author Topic: Plate heat exchanger for DHW.  (Read 6810 times)

aarmga

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Re: Plate heat exchanger for DHW.
« Reply #15 on: February 22, 2017, 07:24:51 AM »

Thanks yoder.  I'm wondering if my hwh has a high limit shut off.  I would run the plate exchanger into the cold side and keep the electric on incase the water temp did happen to fall below 110 but when the water temp is up past 140 like when washing vehicles If the hwh would shut off without me knowing. My father in law has a propane hwh that will shut itself down until reset if the water happens to get to hot.
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E Yoder

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Re: Plate heat exchanger for DHW.
« Reply #16 on: February 22, 2017, 08:25:14 AM »

I've never had a high limit trip doing it the preheating way, but I don't use huge flat plates like some guys do.
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aarmga

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Re: Plate heat exchanger for DHW.
« Reply #17 on: February 22, 2017, 08:35:41 AM »

I think I am going to go that route.  Thanks for the input.  Going to ditch the side arm and preheat the water into the tank and keep the electric on.  Keeps the water fresh and the water warm plus helps keep the temperature more consistent.  This way I still won't run out of hot water if I need to use more than 40 gallons like I do with the side arm and if the stove happens to get cold while I'm away there will still be hot water saved in the tank when I get home. I like the idea of having the consistent water temperature as well.
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shepherd boy

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Re: Plate heat exchanger for DHW.
« Reply #18 on: February 22, 2017, 09:01:53 AM »

I know of some dairy farmers that want hotter water take a regular water heater and put in a commercial stat to jack the temp to 175. I assume the high limit is also higher and wonder if you have trouble hitting the high limit could you take a commercial stat and turn it down to 110 or 120 and gain a higher high limit. I have never had mine to flip but know of a few that have.15 years ago when we used sidearms it was a common problem among other problems.

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aarmga

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Re: Plate heat exchanger for DHW.
« Reply #19 on: February 22, 2017, 09:21:02 AM »

Well as of now I have my hwh turned off so the high limit switch isn't an issue.  If I put the plate exchanger on the cold side heating the water to 150 or 160 degrees before coming into the tank and keeping the hwh turned on just incase the water happens to cool off for whatever reason like not using any hot water all day long I know the high limit will trip.  I just looked and the high limit is 130 on my unit.  I will look into commercial stuff and see if anything is universal.  If that is the case then I'm set to install!
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E Yoder

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Re: Plate heat exchanger for DHW.
« Reply #20 on: February 22, 2017, 12:23:12 PM »

Is your snap disc high limit at 130 or just the temp setting that the electric goes up to? That seems very low.
What size plate exchanger do you have? Dimensions and plates.
It'll take a big one with a lot of flow from the stove to make 160 degree water.
« Last Edit: February 22, 2017, 12:26:11 PM by E Yoder »
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aarmga

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Re: Plate heat exchanger for DHW.
« Reply #21 on: February 22, 2017, 12:56:03 PM »

That is as high as the hwh can go up.  Anything hotter than that the water heater will fault according to the book it came with. I have a 3x8" 30 plate from fleabay.
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RSI

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Re: Plate heat exchanger for DHW.
« Reply #22 on: February 22, 2017, 03:53:52 PM »

Without actually reading your manual, I would guess that it would only fault if higher than that temp and heat elements still energized.
Unless you let the OWB water temp get low you would not need to leave the water heater turned on.
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E Yoder

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Re: Plate heat exchanger for DHW.
« Reply #23 on: February 22, 2017, 04:00:51 PM »

Yeah, that's low.  never saw that low before.
. You might have to turn the pump speed down on the stove loop (that's if it's a 3 speed) to drop the domestic output temp. A 5X12 HX would really trip it quick. Sidearm would be a lot worse.
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shepherd boy

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Re: Plate heat exchanger for DHW.
« Reply #24 on: February 22, 2017, 06:54:40 PM »

I would get a set of commercial stats. Cost should be about $50 for both. They will turn down to 120 degrees, but high limit is 180. You should be able to to run your system however you like with no trouble.
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E Yoder

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Re: Plate heat exchanger for DHW.
« Reply #25 on: February 22, 2017, 08:07:34 PM »

Or run it and see if it trips. If it does you can redo things later.
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mlappin

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Re: Plate heat exchanger for DHW.
« Reply #26 on: February 22, 2017, 11:10:35 PM »

Nice thing about an electric water heater, doesn’t have the flue up the center to constantly lose your stored water temp of to the atmosphere.
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