Tank weights relationship to gallons 6 pounds=1.4 gal 10 pounds=2.4 gal 20 pounds=4 gal
Approximate BTUs
1 Gallon of Propane ~= 4.23 lbs ~= 91,500 BTUs 1 Pound of Propane ~=22,000 BTUs 20 Pound Tank of Propane holds approximately 4 gallons of propane (approximately 366,000 BTUs)
Tankless water heaters (TWH) Reservoir type water heaters are
very inefficient. Having to run your main engine for 30 minutes to get 8 gallons of hot water is not much fun. We could only find one TWH that is built for marine use. Precision Temp has taken a unique approach to solving the ABYC safety standard which calls for a RSCS. This unit will not attempt to light until there is a vacuum created by a powered exhaust. This stops any possible gas leakage into the boat. This TWH will give you about 10 hours of shower time from a 20-pound tank.
Things that make cold Refrigerators: We know of no LPG
refrigerators that are marine approved. This is because of the need for RSCS, the same as for TWH.
How many tanks? Of course, how much propane
you need depends on how much you think you’ll use. Cooking every meal uses more than eating sandwiches, summertime sailing means needing less cabin heating than winter cruising,
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www.downwindmarine.comwww.downwindmarine.com 48° NORTH, JUNE 2011 PAGE 39
and so on. Here are two separate approaches for approximating use: Day use for a couple:
Boil a quart of water – 3000 BTUs (coffee/tea) Broil 2 steak – 1400 BTUs Fry eggs – 750 BTUs Cook pancakes – 1200 BTUs Cook hamburgers – 1400 BTUs Heat soup – 1500 BTUs Shower (short)- 5500 BTUs =14,750 BTUs/day (based on consumption rate estimates) Or
Based on a 30 day cruise we did on a 50’ ketch, cooking only with oven/ broiler for five people, we used 20 pounds of propane. Dividing your LPG supply into
two tanks gives you some safety factor in case of leaks and reminds you when you are at the half-way point. The 50’ ketch above carries two 20-pound tanks. If you sail only on weekends or for a week at a time on a 35’ boat, you could be fine with two 10-pound tanks.
Happy cooking, heating and warm showers with LPG.
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