The system produced acetylene gas which was used for lights, cooking, and sometimes hot water.  

Perhaps an "Editors Hot Property Pick" of the week or month, your property or not, may be best.

Dreams of savings down the road go away when they factor in the additional mortgage cost created by that extra upfront cost.When I was still building in Northern Idaho and put in energy efficient devices advertising them was a negative and several asked if I would take out the non traditional high efficiency tankless hot water heating system.I build to green certification standards but I am  not willing to pay the inspector for certifying them green especially since he had to approve the plans for the homes to be built.I wish you much luck and support your intent but the reality, at least in my experience, is people are willing to talk about being green but won't pay extra or go out of there way to be green if there is even the slightest hindrance to their life style.  

Do you need to dig into the HOA's finances and find out how much went into insurance, how much went into utilities, repairs, maintenance, improvements, then spread that across the number of owners in order to figure out how much of your $300 per month went where, and roll each items back into their respective "slots" to see if they can be counted towards the three safe harbors? 

If at least the domestic hot water run to each unit is separate, you will be able to place the cost with each individual tenant.

If I do put out signs, do I put them up in the extremely hot neighborhood where all the other wholesalers have their signs up or what?

Or the ability to hang art from the back of your fridge - now that's the hot new trend.

I know investors and agents who don't return phone calls or follow up with hot leads.

It seems pretty logical but then again I don't know much about hot water heaters. 

As you know, RO is a very hot market right now.