Electric boiler for SIP building in Pacific Northwest
I have a workshop/garage constructed with SIPs panels and would like a little input regarding the viability of an electric boiler. The shop is used daily and I'm shooting for a minimum interior temperature of 60 F in the winter.
We live in a rural area where there is no access to natural gas so that leaves electric, propane, or heating oil. I've pored over the other postings in the archives regarding electric boilers and the consensus seems to be that they are prohibitively expensive when compared to other fuels.
We have an oil boiler in our home but there is only one person left servicing them in our area and he's not well recommended so I'd like to avoid oil. I've completed a heat loss calculation using an online calculator (builditsolar) but I'm not completely confident in the results (garbage in-garbage out). The shop is is 60'x40' with an18' ceiling. The SIP walls are R-24, the ceiling has blown in insulation at R-49 and there is R-10 foam board under the entire slab as well as around it's perimeter. The Pex tubing is already in place under the 3" slab. There is 80 sqft of double glazed windows, 168 sqft of insulated garage door, and 21 sqft of insulated entry door.
The design loss calculation estimates 33,191BTU/hr and a UA of 738btu/hr-F. I've dabbled with some of the calculations myself regarding gas vs electric and the heat loss calculator will spit out a cost comparison but I'm not certain I'm comparing apples to apples.
We currently pay 6.5 cents KW/hr while propane is $2.69/gallon plus a delivery fee. Does an electric boiler make sense in this situation? Btw the shop currently has it's own lightly used 200amp panel so the cost to hook up the boiler should be minimal.
Any help is greatly appreciated.
Posted Tue, 09/03/2013 - 19:59
Edited Wed, 09/04/2013 - 04:03
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