The cold water pipe feeds the hot water heater first, then branches off to feed all the cold water faucets and the toilet. The problem is that if nobody uses any cold water for a while, the hot water heater heats the water in the cold water inlet pipe, and that heats the water in the cold water supply pipe, so that first thing in the morning, if you turn on the cold water, you will get cool water, then a blast of very hot water, then it will start getting cold. Is there a valve or something that will prevent the hot water heater from heating the water in the cold supply pipe? It isn't so bad if you know about it, but we may be getting some overnight guests, and I don't want them getting any surprises. The house was built in the days before indoor plumbing came to my area, and the person who originally plumbed the house did the best he could, and over the years, things were changed, so now the plumbing is a nightmare. I'd like to rip it all out and start over, but my finances won't allow that at this time. It's a standard tank-type hot water heater There are no zone valves anywhere.
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