It could be as complicated as  a tank,  several pumps to a leach field and an alarm system or as simple as a gravity fed tank and leach field. 

A good deal is like a gravity-well: it draws in money and people interested in making some of it with you.

We are replacing the gravity heater and remodeling the lower unit.I'm excited to really get started investing since I've been learning for several years, thanks BP!

For example, I replaced a 1950 gravity-feed gas furnace with a new SEER 16, added central air and ducts for returns for $5,800 to a 3Br 1Ba rental townhome. 

They are unsophisticated but they see the gravity of the situation and that I am trying to save them.I need to talk to an attorney but it appears it may be wiser to just purchase the property.

The assessment may include a civil engineer looking at the feasibility to gravity feed sewer or need for grinder pumps or a more costly pump station, assessing soil types for building suitability, wetland restrictions or conservation area requirements that may affect the buildable area, assessing zoning and municipality temperament for zoning changes, and maybe at an additional cost a soil test for onsite septic if sewer proves to be unavailable or too costly.

There wasn’t anything I HAD to do to live in there.Quiet street in a good neighborhoodGood sized yard with some “woods”1 stall garageNice patio porchCons: High taxesOil FurnaceNo gravity vents or heat ducts to the master bedroomClaw foot bath unitLessons Learned: Don’t ever be afraid to make a lowball offer.

I made it the yearly $10,000 to illuminate the size and gravity of what she is considering. 

Account Closed - Granted, I'm from an area where I've never seen a house without a furnace (or steam system for radiators or gravity heater or such) but I can't see why a lender would care if a buyer does?

Turns out you need to take intelligent action, not ignoring the laws of gravity, and you have to do it consistently.