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Old 12-07-2010, 03:34 PM   #1
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furnace


i have a 200amp breaker box in the house, can i install a 150amp furnace to that box
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Old 12-07-2010, 04:14 PM   #2
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Theoretically, yes. But this isn't a question that we can answer for you over the internet. What needs to happen is an electrician needs to do a load calculation on your existing panelboard and the home's electrical demand based on the circuits you have in there already and the features of the home. Adding a 150 amp furnace to a 200 amp panel could be fine in some cases, or could be like trying to stuff ten pounds of stuff into a five pound sack.
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Old 12-07-2010, 04:51 PM   #3
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just have stove, water heater,dryer , and about seven 20amp breakers
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Old 12-07-2010, 06:20 PM   #4
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Just curious, but 150 amp furnace seems pretty big; is this for a home? Our home was all electric (stove, water heater, furnace, ac) and was a 200 amp service. I think the furnace was on a 50 or 60 amp dble pole breaker if I remember right.
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Old 12-07-2010, 10:16 PM   #5
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How many KW do that electric furnace you will plan to installed in there and with this big a furnace It will be wise to do the load demeand to make sure it can meet the requirement without issue otherwise you will have to spring it for 320 class service { resdentinal 400 amp service }

and the cost of one 150 amp breaker is not cheap at all and there are some case some electric furnace will have two or more 50 or 60 amp circuits this is true with higher rated KW electric furance.

And with this type of furance genrally HVAC and Electricain will do this hookup for safety issue.

And I am seriouslly have a electrician to come out and take a quick look at your exsting system to make sure it can handle the additonal load.

That one of the two things it always click in my mind large electric furance and electric tankless water heaters both will play hovac on the system if not addressed quick.

Some POCO may have to upgrade the service drop or lateral or change the transfomer to handle more load as need.

Merci.
Marc
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Old 12-08-2010, 04:46 PM   #6
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the deal is, the house is 2400sq ft the retailer we contacted said that we would need a furnace of 25kw (150amp) with a
dbl60amp breaker and a dbl35amp breaker, the furnace has a verible speed motor, what would be the best furnace? maybe a smaller furnace. the house is a semi earth home the north wall, which is the back of the house is in ground and east wall is also in ground, we cool it with just a window unit and it does fairly well at that does this help any?

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Old 12-08-2010, 05:40 PM   #7
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Where are you located?
Other available sources of energy for heating like gas or oil or geothermal considered?
You'll need to have a manual j done for sizing your unit correctly IMO.
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Old 12-08-2010, 05:46 PM   #8
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i'm in missouri just outside st.louis
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Old 12-08-2010, 05:48 PM   #9
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we have a gas furnace now but gas is high (propane) thought maybe a eletric would be better , plus dont like gas
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Old 12-08-2010, 05:55 PM   #10
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IMO you need to understand the heating needs of the house you are building and it sounds like if it is earth-bound on two sides that it needs to be done by someone who understands this kind of housing and heat gain/loss effects. I don't think you can go off of sq. feet (not that one really should). Once you know heat needs, you can determine the cost of various heating systems. Who is the "retailer" you mentioned? A heating company or the home builder or some other kind?
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Old 12-08-2010, 06:17 PM   #11
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okay i thank you for all of your help and information
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