On Sep 18, 1:16 pm, " wrote:
On Sep 17, 4:09 pm, roperman wrote:

My friend says this won't save any energy, because warming
up the hot water tank from a low temperature will take more
energy than heating it up throughout the day, where the
temp differential is lower.

Jay

No it won't.

See Chris's reply.

Your system will operate at higher efficiency when:
a. It runs for a single long period rather than a multitude of
short periods
b. It heats cooler water

-J

If you heat the tank al the time the temp differentle is less than if
you turn it off for 24 and turn it on . The tank has to run longer to
heat it,s self back to temp after 24 hrs. If you want to save money
get a new well insulated tank and you will be fine. Even put in
smaller elements but is it really worth it .