If they had grease on the driveway you can charge to have that cleanedJunk removed from premisesBack rentUtilities owedBroken WindowsDish on the roof when the lease states no disk on the roof  (Dish generates holes in the roof which is a costly repair)Broken cupboardsCan't charge for cleaning the place after they leaveThe wash machine was dead due to the flood. 

I wasn't even thinking of the increased rent factor, but that alone might pay for the machine in a year or two, I would think.

Ultimately, it depends on the recovery rate of the water heater {gas or electric } and whether your washing machines are High Efficiency (HE) units.If you have 2 HE washers, then a 40-usg tank should be ample.  

My fourplex has a service that they service the washing machine/dryer and I collect a percentage based on the usage. 

They are small machines designed for the lower volume professional painter (prices usually in the $900-1200 range).  

That first investment needs to become your own personal "money machine", your own ATM.  

If we were dealing with logical, predictable machines - i.e., something actually measurable, that would be all you would need. 

They have over 3,000 properties so their system is a well oiled machine.

The bricks, sticks, wires, pipes and machines WILL BREAK.  

Machine translation has become quite sophisticated and many more reliable programs are available via the internet that could be useful.