Project Guide

How to Install a Gas Water Heater

1
DRAIN THE TANK
Connect  gas supply line - Install Gas Water Heater
  • Turn off the water and gas supply. 
  • Attach a garden hose to the drain valve and empty the tank. 
  • Turn on a hot water faucet to allow air into the system.
2
DISCONNECT THE GAS LINE AND WATER LINES
Disconnect  gas line water lines - Install Gas Water Heater
  • Disconnect the gas line using two pipe wrenches -- disconnect the gas line at the union fitting if the pipe is galvanized, or at the flare fitting if the gas supply line is copper. 
  • Using two adjustable wrenches or pipe wrenches, disconnect the water lines above the tank. If the piping has been soldered into place, use a hacksaw or tubing cutter to cut the pipe. Make sure the cuts are straight.
3
DETACH THE GAS EXHAUST FROM THE FLUE HAT
Detach  gas exhaust flue hat - Install Gas Water Heater
  • Remove the screws connecting the vent to the water heater using a screwdriver or nut driver. 
  • Remove the old water heater – you may require help for this because older water heaters fill with sediment and are heavier than new ones.
4
SET THE NEW WATER HEATER IN PLACE
Set water heater in place - Install Gas Water Heater
  • Install the water heater in an area with at least 6 inches of clearance on all sides for ventilation. Allow unobstructed access to the burner and controls. 
  • Place a carpenter’s level on the side of the water heater and level it with plastic shims if necessary. 
  • Reconnect the flue hat to the gas exhaust vent.
5
INSTALL THE HEAT TRAP FITTINGS
heat trap fittings - Install Gas Water Heater
  • Wrap the water heater heat trap fitting pipe threads using Teflon tape. These fittings are directional and must be installed properly -- both have arrows showing the correct direction for installation. 
  • Attach the blue-coded fitting to the cold water inlet with the arrow facing into the water heater. 
  • Attach the red fitting to the hot water outlet with the arrow pointing away from the water heater. 
  • Tighten using a pipe wrench or adjustable pliers.
6
INSTALL WATER LINE CONNECTIONS
water line connections - Install Gas Water Heater
  • Measure and cut the water line connections to length. 
  • Reconnect the water line.
7
CONNECT THE GAS SUPPLY LINE
Connect  gas supply line - Install Gas Water Heater
  • Before connecting the gas line, clean all threads with a wire brush and rag. 
  • Apply piping compound to the threads of the black pipes as you connect them. 
  • Assemble and tighten each fitting with two pipe wrenches. 
  • Install the union fitting last because it connects the new line to the existing line. When finished, open the gas supply valve and turn the water on. 
  • Turn on water at the tank, then turn on one or more hot water faucets to bleed air out of the system.
8
TEST THE GAS LINE FOR LEAKS
Test  gas line leaks - Install Gas Water Heater
  • Fill a sponge with a mixture of liquid dishwashing soap and water, and apply it to the new fitting. Check for bubbles. 
  • Test all connections. If there's a leak, bubbles will form on the surface and you'll have to refit the joint.
9
LIGHT THE PILOT
Light pilot - Install Gas Water Heater
  • Remove the burner access panel. 
  • Turn the knob on top of the control box to the pilot position. 
  • Hold a lit fireplace match or barbecue lighter to the pilot access opening. 
  • Press and hold down the reset button on the control box for 60 seconds after the pilot ignites.
10
TURN THE CONTROL KNOB ON
Turn control knob on - Install Gas Water Heater
  • Turn the knob on top of the control box to the On position -- you should hear the burner ignite. 
  • If it doesn't, remove the access panel and relight the pilot. 
  • Replace the burner access panel and set the control at a temperature between 118 and 123 degree