( ie. full month, 1/2 month ) Maybe you are using Obligo or another service/product that allows the tenant to pay a low nonrefundable monthly fee to insure their unit against damages.

If that is the case, you keep her money as liquidated damages and start your marketing engine back up in earnest.As a matter of practice, I NEVER stop marketing until a lease is signed.

Then you can grab the burners primary air with another vent from outside the house also using a pvc vent.

I would be shocked if the damage to this unit wasn't followed very soon by the same damage to other units...as the water finds its way around and takes a tour of your building.

The tenant has been paying rent on time, and I have no reason to suspect he has caused major damage or does anything bad in the house.

The question: What are the best ways to water proof the house especially against major damage from water heater, fridge, dish washer, washing machine, plumbing leaks?

The insurance I am talking about is insurance to protect your property such as from fire, damage, etc. 

I’m working on rehabbing a house, and I’m considering adding central air and heat.

We found the PM has been burning through our money (almost $2,000 for 2019 plumbing bills, due to hiring people on weekends for simple things), not calling us in a timely manner when we had an unrelated issue cause water damage!

I've not had a late payment or any damages (knock on wood).