Possible to Convert two 12v Hardwires to 240v?

[CHIEF 5201]

I have two 50 gallon 120v hardwired water heaters, one went out last night, they are in a series, and the one that went out was the front unit, so no hot water. I am a builder and I have been using Eco 36 electric tankless, thought I might convert, here at home. Each water heater is on a single DP 30 amp breaker, the Eco 36 requires four 40 amp DP breakers, I have the room in the breaker panel. Can this be accomplished by running both existing hardwires to the 240v tankless unit, or would it require running new wires? Thanks.

 

CHIEF

[Parliament 14559]

Use your best guess and start splicing. If your 1st attempt fails, just try it different.

 

 

[Rimbo 26853]

220, 221... whatever it takes.

[CHIEF 5201]

Finally talked to my electrician, he said it could be done, we could use the old wires to pull the old ones through, but I don't have the space for the extra breakers, and would have to put in a third subpanel. It got way too expensive at that point.

 

CHIEF

[El Diablo 4232]

That's a lot of juice. TWSS.

[Clackles 276]

1 hour ago, El Diablo said:

That's a lot of juice. TWSS.

It’s piss.