I had looked into this, but decided against due to several reasons:
1) In the long run, adding up all costs, it really doesn't save any appreciable amount of money.
2) The cost of the install is equal to or greater than the cost of the heater making this a losing $$ proposition. You can't do a self install if you want a warranty. Every manufacturer requires that installation be performed by a certified electrician for a valid warranty. If you install yourself, no warranty. I'm an Electrical Engineer, and this is a simple install.
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