Lots of blue collar factory jobs have been automated years ago.  

Any water heater has an infinite lifespan IF IF IF -The tank lining was installed properly at the factory.The factory workers handled it gently enough to avoid cracking it.The plumbing supply guys handled it at least as well.The plumber handled and installed it even more gently.It landed, fully intact, at the end user's address.And which then was properly maintained afterwards.Until very recently I owned a house which had a gas water heater which had been installed in 1958.  

This to me has the potential to offer a much smaller ick factor.    I

The biggest factor is going to be your structural, and that will depend on the soils, etc. 

Another factor is the incoming water temp.

Yes, the headache factor is high in them - if you rent them, as I used to.

But if your primary concern is reducing your expenses as you near retirement them that factor is really not very important at all. 

Hi Group,I have a property under contract right now that is a historic factory built in 1924.

My dad, aunts, and others worked mostly at the BF Goodrich factory there and my aunt became vice-president of the Union Market National Bank way before women generally held such positions.

Equity is certain forms can be pledged as collateral or borrowed against.Yet another factor is how stables one's current cash flow is.