Posted by JD Seller on December 05, 2016 at 17:46:00 from (208.126.196.24):
In Reply to: LP water heater? posted by tomstractorsandtoys on December 05, 2016 at 05:56:36:
Tom I will disagree with the majority of the posts here. You can add a power vent to the water heater as long as it is electrically controlled. Meaning the water heater has a control that sends current to the gas valve to come on. Your water heater might have had a power vent as an option many do. So check for a KIT to use on yours. Many of the older power vents where added on when the water heater was installed not at the factory. You can buy kits on Ebay starting at about $75.
Even if there is not a kit for your water heater model,it is just a fan that goes where the vent currently goes. You can get one off a similar water heater or even a small furnace and make it work. You hook it up to a relay that is turned on when the gas valve is opened. I use a timed delay relay that stays on for one minute after the power is cut to it. This way you know any fumes are blown out even after the burner shuts down.
I have switched all my rentals to power vents. Water heaters and furnaces. You just have less trouble with them over the open vents.
In a shop I would mount the water heater on a platform at least 18 inches off the floor. This is because gas fumes stay at floor level. So you may not smell them but there could be flammable amounts at the floor level.
National Fuel Gas Code 2002
Chapter 8 Equipment Installation
8.1 General.
8.1.10 Installation in Residential Garages.
8.1.10.1 Gas utilization equipment in residential garages and in adjacent spaces that open to the garage and are not part of the living space of a dwelling unit shall be installed so that all burners and burner ignition devices are located not less than 18 in. (460 mm) above the floor unless listed as flammable vapor ignition resistant.
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