I have a nice little cottage up in Mentone Alabama. 1000 sqft plus. Two showers, washing machine, dishwasher. We will be renting it out. The water heater is a squat 30-40 gallons. Not near enough. When we go up, it’s 2-3 people, maybe four. Space is tight. I’d like to consider a tankless. Service is 200 amps. Panel is 35-45% occupied. We like our showers! Please recommend a unit that will answer the mail. Thank u!! Oh, can I install it? I’m handy.