Its awesome.They are like 98 % efficient. Install was a breeze.They are about the size of a large microwave.Everything is plastic now right? No more copper and elbows and t's etc,its all pex now.Just disconnect old tank,and hook-up tank less right there.
They take about 5-8 seconds to get hot water,so a tank might be a couple seconds faster,no big deal.
Money saving for sure.While the fam is out of the house all day,you dont have 40 or 60 gallons of water boiling away.
I got Gub'ment grants to switch all our old crap out for new.There was no questions asked.Its not for the poor or the rich,its for everybody.Got like 60% of my money back on tankless,new furnace,and life breath system.
I am a fairly handy guy,but would not have attempted this alone.I have a class A gas fitter/plumber living across the street.He told me what to do,and checked on my progress from time to time.
RSD.