Our hard costs came out to about $22k/site, including chipseal roads, clubhouse with heated pool, 5k gallon septic system.  

We pay $30 a gallon for Sherwin Williams Superpaint.

Example: fixed rate of $10 for the first 1k gallons, $2/thousand for everything beyond that.

Even if you poured five gallons of water down a wall, from top to bottom, it would likely dry out on its own without any real damage.

The other thing that HD does it they tie your HD Commercial Card to Shell for gas rewards and you can get 1% of all Home Depot Purchases available as free gas. ie, spend $100 at HD and get $.10 per gallon at Shell gas stations. 

You can find some 0.8 or 1.2 gallon flush toilets that work well and won't leak.

By the way, changing a 40 gallon water heater in pouring rain, getting sick, and recovering so tenants can have hot water humbled me.

We had one spring a leak in the middle of winter (just a pinhole) gallons came out but the tenant got buckets under it and it was $2500 for replacement with a roth double wall tank and removal of old tank.

Took a 30 gallon pressure vessel and clamshelled it. 

I suggest finding out the capacity in gallons and the heat output measured in BTU's, and do some research to find out if it's sufficient.