Re: Is it safe to store boat in garage w/H2O heater???
I've never heard that an electric heater is more energy efficient than gas. That would surprise most of the people in my area.
I always thought the electric companies gave them away because they made so much money on the electricity used.
actually its a play on words, electric heaters are 100% efficient because all the energy goes into producing heat but gas heaters have to expel the carbon monoxide fumes so some heat is lost in this process so when measured its only around 80-90% efficient. that's where the tag line comes from.
now when you measure the "cost" to produce heat the gas heater gets hot faster and produces heat even after the gas is shut off as it cools down so the gas heater needs to run less to heat the same space so it saves you money and is more efficient in the heat vs cost to produce that heat category. also in extreme cold temps only gas can keep up with the heat load and electric heaters will run constantly making your electric bill soar.
I spent 35 years working in a/c & htg
as to the question of the garage, well if you have your lawn mower and a can of gas in there then that's 100 times more likely to catch fire then your boat. that said if you have a "dripping" fuel leak then that could be dangerous but not under normal conditions and as long as you are up to code and the water heater is at least 18" off of the floor then you are ok and its safe.
if you still have concerns then adding open vents in your garage door or outer wall will allow any build up of fumes to escape and take away any chance of that danger.
I have also built a closet around the water heater but that requires an added vent through the wall to give it the fresh air it needs for proper combustion. this solution will make a wife happy if she continues to drive you nuts worrying about nothing. just be sure to leave the exhaust vent alone because you don't want to mess with it and cause any co2 leaks