What size marine watermaker is right for my boat?
• Marine watermakers should provide ample fresh water to all passengers onboard on a daily basis. As a guideline, the U.S. Coast Guard recommends that 30 gallons of water per person per day should be available onboard. So, for example, if you are planning for 4 people onboard, then you should plan on having 120 gallons of water available per day. Next, determine how many hours per day you want to operate the watermaker to make the capacity that you need. Most people are comfortable with between two and five hours per day. Then, compute how many gallons of water you need to make per hour to make your daily demand considering the period of time you would want to operate the watermaker. Considering the example above, if a person wanted to make 120 gallons of water in a two-hour time period, then a watermaker capable of producing 60 gallons of water per hour is required. Marine watermakers are rated based upon how many gallons of water they are capable of producing per hour. This informati
