Always, would open hot water at faucet or shower, let water run a few minutes, then water would turn hot. Now, the last two weeks, water is hot when faucet hot water, turned on. As long as I have lived in my home, this has been the case. What could have changed or what problem could be happening, to cause, this change?

Do you have a hot water recirculating system on your hot water tank? How far are you from the heater? Is this the only branch affected? Back to you, Tom

Do you have a basement or a crawl space or is house on concrete slab?