I'm considering using an electric hot water heater (EHWH) with upper and lower heating elements as an electric diversion load. This EHWH would be for pre-heating the water bound for the standard HWH.
Often the total watt rating of the EHWH is larger of the two elements - instead of the sum. Is it allowed (*) to energize both heating elements at the same time?
- 'allowed' means - general technical limitation of the EHWH - not necessary code related. Also I'm also interested relevant code limitations and their reasons.
** Might also be relevant to post in a different forum?