When notes stuck to the water heater failed [Ryan] decided to whip up “the world’s most expensive 240V relay” using a servo, a real time clock and of course an Arduino. All in an attempt to save a ...

Q: A neighbor told me he has a timer on his water heater that was recommended to him as an energy-saver. Do these things really work? A: Actually, there are a couple of schools of thought on using a ...

Question: You recently wrote about putting a timer on a water heater to save energy. My utility company told me that would be a waste of money because it actually would save little energy. Who's right ...