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Start with what you’ve got. If what you’ve got is a 100-amp service, but you don’t feel like upgrading, go infrared or portable. If what you’ve got is a 200-amp service with a little to spare, steam is an option. Simple enough, right?
In addition, check how many slots are on your panel. If there aren’t openings on your breaker box, it becomes harder and costlier to add more circuits. Newer installations have, on average, 40 slots, while the old ones might only have 12-20 slots.