In the case of a house in a flood zone, they will require a flood policy be purchased.The normal policy for a 1-4 family rental is a Dwelling Fire Policy (sometimes called a Landlord or other name by the company). 

You will need to make sure your hot water heater is big enough to even support that many showers.One option is let the people share your bathroom with you.

Buy 1 to test the waters.

Tenants left the washer valves on when moving out causing serious damage when Water Authority turned the water back on. 1) Tenants disconnected the water a week before the move-out date without informing my PM.

Black Rock was gonna flood the market with cash and all I needed to do was get out there with a bucket and catch some of it in the form of commission. 

Is the current boiler steam or hot water ?

My capex budget includes, roof, floors, hvac, appliances, hot water heater, exterior paint, bath and kitchen remodel, etc.

After a month we had to replace the water boiler but my broker negotiated with the seller to pay for home appliances insurance and it was covered, however, we were aware since the home inspector pointed it out that it is old and may need to be replaced.

This unit has an electric water heater, so the main concern with water is specifically HOT water.This is out of town for me, in a southern state that's an AC-dominant area.

Utilities (e.g. water, electricity): is $300 / month a reasonable estimate?