Home Automation

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Home automation is the residential extension of building automation.

It is automation of the home, housework or household activity.

Home automation may include centralized control of lighting, HVAC (heating, ventilation and air conditioning), appliances, security locks of gates and doors and other systems, to provide improved convenience, comfort, energy efficiency and security.

Warning: Working with electricity can result in injury, property damage, or even death if it is not done properly. Please keep this in mind while assisting others. If you are not sure about what you are doing, hire a licensed professional.

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Automate my hot water heater (alien.top)

submitted 10 months ago by [email protected] to c/[email protected]

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I am typically the first one in my house to take a shower and I like hot showers. I have noticed that if I take a shower first, the hot water is not that hot and doesn't last very long. But if others take showers before me and the hot water has to recharge then the hot water is HOT and lasts a long time.

I have a 50 gallon hot water tank.

The only two things I have (besides sinks and showers) that use hot water are a dumb dishwasher and a dumb washing machine.

What I was thinking was to set up an automation in HA to somehow trigger something to use hot water for like 10 minutes in order to get the hot water heater to recharge.

Any ideas?

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[–] [email protected] 1 points 10 months ago

It's not that your water heater is recharging, it's that when there is no water moving through your pipes, the hot water in the pipe eventually cools off. When you turn on the shower, all the water already in the pipes has to flow out of the shower head before the hot water in the tank heater reaches the showerhead.

You can waste a lot of water constantly running it for ten minutes, but if you're willing to make the investment you can introduce a hot water recirculating pump into your home. A plumber adjusts your plumbing so that instead of pipes spidering out to all your taps from your hot water tank the hot water lines form a loop that returns back to the hot water heater, and the pump keeps water moving through the loop, so that any give tap always has immediate hot water (or at least warm water, the loop is never perfectly hot so you usually get a warm shower that gets hotter after a couple of minutes).

The downside is that unless your plumbing is easily accessible, the most likely approach to the loop is to use the cold water lines as the return loop, which means that instead of waiting for hot water from a cold shower, you'll have a tap that is warm out the cold side until the loop clears and then you get cold water. They will usually leave the kitchen sink out of the loop so that people who fill their glass from the tap don't have to wait.