It seems like tankless heaters have gone down in price since the last time I looked. Why would I want to avoid them? Why would they cost more to install? The weight issue alone seems to make it easier. Isn't it basically the same hook-ups? Power, in and out water pipes? I'm not trying to be a smart*****, I haven't dealt with this in 40 years.
@skutfarcus :
A 32 KW electric TWH will draw 133 amps on full fire. By contrast your tank type heater is probably 4.5 KW drawing 18 amps.
32 KW will get you around 3 gpm @ 70 degree rise. They only get smaller from there.
The ONLY benefit to an ELECTRIC tankless water heater is saving room. Period.