Learn about tankless water heaters, gas vs. electric efficiency. Find out why tankless water heaters are highly energy efficient when run on gas, but electric tankless water heaters are not efficient.
LESLIE: David in Delaware has a water heater question. What can we do for you?
TOM: Actually not, David, because gas tankless water heaters are fantastically efficient ; electric tankless water heaters, not so much. So if you have electric, what we would recommend is a super-insulated tank-style water heater . There are different manufacturers that have this type of model. I think Rheem has one called Marathon , if I remember correctly, that has a very thick wall of insulation. That, coupled with a water heater timer  so it only comes on …
LESLIE: When you need it.
TOM: … when you actually need it would be the best way to cut your electric water-heating costs . Gas is fantastic for tankless but not electric, because you just can’t deliver enough power to do the job.
DAVID: Where would you get the timers?
TOM: Well, the timers are available at any electrical supply store or home center. You just want a 240-volt timer.
DAVID: OK. Very good.
TOM: Usually gets installed right near the water heater and you want to set it to come on for a few hours in the morning when you need it for showers and that sort of thing; few hours in the afternoon and evening; then it can go off for the rest of the time. The water will stay warm in the water heater. As long as you’re not using a lot of it you’ll be good to go.
DAVID: Very good.