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You link didn't work however the 12 amp draw on the heater should be ok on a 15 amp circuit because it really dosen't have an inrush current like a motor does
The pump should be just fine onn the 15 amp circuit
I don't know rule of thumb and if you do the caculations is anything over 100 feet warrents a larger gauge wire
I would feel safe with the 14 ga wire the biggest thing is on a long run is the voltage drop which increases amperage
You are only 45 feet that's not even close to worry about