OK, here's a real simple (aka dumb) question.
We have two identical residential side-by-side (80 gallon?) gas hot
water heaters located in the basement. Both were installed together and
are about 3 years old. They are connected in series. There is a
(passive) recirculation loop connected betweent both tanks and
somewhere on the thidr floor.
What is the recommended temp DIFFERENCE setting for this setup? Say
tank #1 gets the input cold water from the street and tank #2 supplies
the hot water to the house.
#1 temp higher than #2 ?
#2 temp higher than #1 ?
both temp set the same ?
Some considerations are:
A. operating costs
B. tank life time
C. recirculation loop operation
There are only two people in our house so recovery is a lesser issue.
A plumber once said to set tank #1 (the street tank) temperature lower
than tank #2 to get a longer life time from tank #1.