Thanks everyone! I see I had a bunch of misleading values in there (like showing squarefeet in the VA column for the 3VA*sqft, etc.) which might have been confusing.
Unfortunately, I don't know the true watts of the emergency heat. The current is between 50-60, I can glean that much off the breaker panel, but I don't know what the existing heater is and was just going to provide for whatever the docs that come with the new heat pump call out. They're both 3-ton units heating the same sqft of finished space, so I assume they will be similar if not identical.
Likewise, I don't have hard numbers on the freestanding range, and (40A 240) UL listings don't help, so 20*240=probably overkill. Oddly enough, adding up all the heating elements on the range gives about 60A 240...
Service Calcs: VA:
3VA/1500 4500
3VA/2000 6000
1500VA Ckts 4500
Water Htr 5196
Range 9600
Dryer 6720
Subtotal: 36516
First 10k: 10000
40% of rest: 10606
New Subtotal: 20606
Furnace 1 14400
Furnace 2 14400 Amps:
Total: 49406 206
per phase: 24703 206
Swapping 10k for 8k gives exactly 200A load, coincidentally enough! Since the furnace and range were conservative estimates, that gives a *little* fudge room, but it's still awfully close.
As an aside, why would existing homes be allowed 8k vice 10k?
[This message has been edited by SteveFehr (edited 03-19-2005).]
[This message has been edited by SteveFehr (edited 03-19-2005).]
