Pipes getting heated up.

Hi all,
I had two leaks in the pipe leading to the heater in my garage. I had called a plumbing services company to fix it and it was soon done. A couple of weeks later, the pipes were heating up so much that it can't be touched. I tried checking all connections to the water heater to make sure that heater doesn't have a leak. All the connections were shut down and kept close till the pipes to cool down. The heat came down but soon after a couple of hours it started getting heated up again. I'm still confused. Before the plumbing company arrives, is there something I can do? Does this problem sound serious? Any suggestions?
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