Here are some tips to help you install your hot water heater venting system.
Position the hot water heater so that it will line up with the vent pipe and install the draft hood into the hole on the top of the heater straight up and as far as it will reach.
All horizontal runs should be sloped in an upward position of at least ¼ inch per foot, and secure the vent pipes into position with metal screws.
Connect the hot and cold water pipes using copper flex-connectors as they are very flexible and can be easily positioned to suit.
These copper flex-connecters come in different lengths and are connected through male adapters, and they can either by threaded metal or sweat-soldered copper.
Depending on whether your water heater is designed with male or female threading you will have to use the appropriate flex connectors.
These connectors and positioned at the very top and should be placed directly into the ends of the thread pipes.
For installing a sweat-solder connector you will have to do your soldering before you position the flex connector, in order to prevent it from getting damaged by the soldering.
If you are using PVC or BB plastic pipe fittings it will not be necessary for you to use flex connectors, as these use "transition unions" which goes between the metal heater threads and the plastic piping.
You will probably have to use a foot long thread steel nipple which should be placed between the water heater and these transition unions in order to keep them away from conducted burner heat.
Two more additional transition unions will have to be placed at the top end just where the plastic risers are joined to the thread metal water lines, and you will also have to seal these joints using the appropriate solvent.
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