An apt, do you rent or own the building. You cant be renting or this is
your landlords issue.Tankless are great I will get a 4.5 yr payback,
they can last 30+ yrs, there is no tank to rust, only copper pipe. And
you only pay to heat what is used. You can spend 450-2000$ for one, but
pipe sizing is an issue, they use alot of Btu, up to near 200,000.