I really can't understand why people are still using instant water heaters
Safety aside, don't you guys want a nice strong shower?
These instant heaters are like getting pissed on by a toddler. No I take that back. Even a toddlers piss is stronger.

It can't be the cost cause the ones with pump cost as much as a storage heaters

The ones with so-called rain shower is a joke. As for those with buildin pump, the pressure is better but the flow rate is still too low for a nice shower experience .