We've had the electric shower head system and..........we're still here
. Also had an electric calentadora but we switched to solar for the hot water only and are very happy with it. It halved the electricity bill & we always have hot water (minus a few days when it rained five days non-stop).
Adrianb, I think it best to ignore Skippy's remark about HB. He's very new & despite his 36 years experience in electrical engineering he managed to get himself in this position
Edesur supply or not supply
so............he's still at the stage of needing to adjust his undoubted theoretical & practical experience to the realities of life in the DR. And that adjustment is quite subtle and only comes with time. I guess that's where the 40 years experience comes in handy, eh?
And Skippy, go easy on criticising one of the most respected members of DR1. These things usually lead to a pointless fight.