As long as it doesn’t leak, you can replace the elements.................I have a gas heater for the main part of the house and a small electric in our MB.............
Many plumbing warehouses have anticipated the upgrade, and have stocked up on the older units, whose warranty doesn't begin until the unit is installed .
THe additional cost is around $150.oo for the newer units
but as noted, there are different size requirements, whereby the newer units will no longer fit in already established replacment areas.
So , you may have to call around ...
Thank you EPA for saving us money, by costing us more,..
Don't forget ,.., the 'Science is already in ' ( B.S. !!)