Also research the water system if you are supplying water from a well. 

Does anyone have a recommendation for a plumber to handle a hot water heater replacement in the Raleigh area? 

Soviet-style blocks were built, but without even private baths of any sort--those had to be traveled to--and no hot water whatsoever. 

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.

Getting your head above water as a real estate agent is a tough one.

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.