ELECTRIC tankless waterheater? I've asked before but solitary got answers in the region of gas...

I've asked before but solitary got answers in the region of gas tankless water space heater. Gas is not an option for me. Has anyone just now switched from regular ELECTRIC water stove to ELECTRIC TANKLESS water radiator?
If you have, how much difference did it get on your ELECTRIC BILL.
Are there any one brands to avoid?
Thanks for any help you can contribute.
I own two bathrooms surrounded by my house...
Answers:    they are cost prohibbitive.
Can your hot river header explanation low pressure...
The good ones operate on 220V. Also, brand name sure you have soft river. Hard water plays havoc on these unit. The main piece that matters is the incoming warmth of your water. If you live within a cold climate and the water is, let's vote 53F, it is hard to warmness enough hose for more than a shower with one of these unit. You will probably get the best results by installing more than one component. Like a unit at every wet source.(i.e.-one for the bath, one for the kitchen, one for the mop up machine). Hope this helps! Kind regard!..................L