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Author Topic: newbie dhw question  (Read 2386 times)

hayburner

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newbie dhw question
« on: March 10, 2014, 12:45:06 PM »
in cb brochure they have the owb plumbed to dhw first than to the forced air furnace than back to owb. is this a good way to go, does it matter? to me it would go to forced air furnace first allowing greatest heat exchange where it is needed most, but I am new to this and will be doing this this next summer.
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slimjim

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Re: newbie dhw question
« Reply #1 on: March 10, 2014, 01:52:31 PM »
Your domestic water temp may suffer by doing that
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RSI

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Re: newbie dhw question
« Reply #2 on: March 10, 2014, 02:30:40 PM »
If you have a problem heating your house with the DHW first you have a poorly setup system.

You won't notice the furnace blower run an extra couple minutes but you will notice if the water is not hot enough.
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hayburner

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Re: newbie dhw question
« Reply #3 on: March 10, 2014, 02:47:31 PM »
thanks for all the info. lots of helpful people around here. I am glad i found this site so i can get my planned 5000e purchase this summer setup right to heat my old farm house.
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NaturallyAspirated

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Re: newbie dhw question
« Reply #4 on: March 10, 2014, 05:21:42 PM »
Have you done or had done a heat load on your house?

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cantoo

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Re: newbie dhw question
« Reply #5 on: March 10, 2014, 06:52:55 PM »
hayburner, I have my dhw hooked up 1st so that hottest water goes to it. I have my house on a tube exchanger and my other house on a plate exchanger. On the plate exchanger we have some issues with the water getting cold in the tank after not being used for several days. Not a problem just something to think about. Tube downfall is if you use large amounts of hot water it might have an issue keeping up. We don't have a huge demand so it's works great in our house.
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slimjim

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Re: newbie dhw question
« Reply #6 on: March 10, 2014, 06:55:44 PM »
Wait a minute, your newbie status says you are undecided, sounds like a plant to me, Just kidding, pay attention to Scott and Yoder, they will help you out.
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Sprinter

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Re: newbie dhw question
« Reply #7 on: March 10, 2014, 07:40:00 PM »
Or you could have a hydraulic separator and feed both furnace and water heater with 180 degree water. A simple electric water heater stat can control a 007 to turn on only when it calls for it. Probably have faster recovery and you can control what temp the water heater heats up to. By doing the brochure one giant loop design you have no control and have to add a mixing valve for safe temps. This also cuts the loop size in half and you can use smaller cheaper circulators instead of one big one. This gives you more flexibility in BTU control and efficiency.
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