I recommend S3.
Electricity costs depends on where you live.
why s3 ? more powerful s5.
i interested me i that install 30 miner in one house after some don't burn ? enough power wants 30 miners
It depends on your electricity price. If very low a S3 is better for some. Most the S5 is better with its more efficient chips.
And go slow.... I highly doubt your house can handle 30 miners. It's summer and heat with 30 miners will be hard to deal with. Not to mention setup costs.
Did you contact Bitmain on your first miner and get it running properly yet?
yes i have very low cost electry 1KW- 0.05$ this means that s5 can't withstand .
than i will buy s3 .