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Author Topic: Plate exchanger or side arm for DHW??  (Read 244 times)

d5knapp

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Plate exchanger or side arm for DHW??
« on: July 10, 2017, 08:14:13 PM »

Moving into a new house soon and having to put in a new setup just wondering your guyses opinions I'm going with a plate exchanger or a side arm? Pros and cons of each? Thanks everyone
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mlappin

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Re: Plate exchanger or side arm for DHW??
« Reply #1 on: July 11, 2017, 06:41:39 AM »

Sidearms usually have less maintenance and pull less on the boiler because the recovery time is longer.

A plate HX will give you unlimited hot water but require flushing once a year, with the unlimited hot water comes a much larger load on the boiler.
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E Yoder

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Re: Plate exchanger or side arm for DHW??
« Reply #2 on: July 11, 2017, 10:57:23 AM »

Water that plugs a flat plate can eventually plug a sidearm. At least I've seen plugged up older ones. ? Def takes longer like you said.

We had a job the other day where I doubt there was more than 3 gpm available on the main line coming in. Used two flat plates in series, total of 15" in length. Got approx. 130℉ water out of it on the domestic side with three faucets running. I was surprised, but counter flowing over distance really helps.
« Last Edit: July 11, 2017, 11:20:23 AM by E Yoder »
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RSI

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Re: Plate exchanger or side arm for DHW??
« Reply #3 on: July 11, 2017, 02:31:38 PM »

It all depends on your water quality if you  need to flush a flat plate. Around here with a softened water, most never require flushing.

If you have an older water heater, I would not put a sidearm on it. The sediment in the bottom of the tank can plug it fairly quick.

If you use very little hot water, I would probably go with a sidearm. If you have normal or high volume usage, a plate is going to be better in most cases.
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mlappin

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Re: Plate exchanger or side arm for DHW??
« Reply #4 on: July 11, 2017, 03:11:51 PM »

It all depends on your water quality if you  need to flush a flat plate. Around here with a softened water, most never require flushing.



We have a water softener, just installed a new one awhile back, without it according to the Hach test kit I bought we have 37 grains of hardness, with we have less than one grain. Still get rust stains on stuff though if you have a drip. I use a gallon of cleaning vinegar to flush mine, easy enough to do if it was properly installed with the proper valves and only costs a few dollars for the vinegar. I get a little extra cash Iím going to install the rust filter from the same company that makes the softener, very happy with it so far.
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shepherd boy

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Re: Plate exchanger or side arm for DHW??
« Reply #5 on: July 11, 2017, 05:57:19 PM »

Depends on your water. My flat plate's about 10yrs, and never cleaned it. Never run out of hot water when stove runs. Had a side arm before with air locks, sediment ,leaks. Never again.
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d5knapp

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Re: Plate exchanger or side arm for DHW??
« Reply #6 on: July 11, 2017, 08:49:13 PM »

Thanks guys I'm hearing that a flat plate is the way to go
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