Are they all they're cracked up to be? I deal mostly on the commercial side of things so I don't know much about these hot water heaters. I've recently purchased a home with oil heating, I'm changing everything out for gas, including the hot water tank. Was thinking of going to an 80 000 btu instantaneous for my hot water. Is it worth it if I'm only using for my domestic hot water needs? Are they all that the sales say they're cracked up to be? All the hot water you can use without running out? Will I save that much on gas compared to your average 40 000 btu hot water tank. Do I need a circulating loop on the hot water side or can I go cold in, hot out without a loop? What are the best brands? Thanks guys.