How to Replace a Gas Water Heater

Everything you need to know for a safe, successful gas water heater replacement. Watch as Ben Goheen, a master plumber with 15 years of experience, explains how a gas water heater with a thermal expansion tank works and how to know if it needs replacing. Learn how to properly remove your old water heater and easily install a new one with SharkBite Max. See below for important instructions for a safe, reliable and efficient installation.*
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00:00 Introduction
00:28 Examine the water heater
01:33 Thermal expansion tank info
02:52 Test your house pressure
05:24 Drain the water heater
07:33 Disconnect vent
08:46 Disconnect the gas line
09:49 Disconnect the sediment trap and relief line
11:35 Disconnect the thermal expansion tank
14:42 Remove the old water heater
15:27 Prep the hot and cold supply lines
19:56 Prep the relief line and gas line
22:07 Install drain pan, set the water heater
23:52 Install draft hood and vent
26:14 Install a ball valve on the cold-water line
29:25 Install the slip tee and cold-water connector
31:41 Install the hot water connector
33:08 Install the thermal expansion tank
35:56 Check connections and bleed the air out
37:12 Install the gas line
40:29 Install the relief line
44:53 Bleed the air out of the system
46:22 Check the connections
47:53 Outro
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*Water Heater Installation Best Practices
This installation involves shutting the cold-water shut-off on and off several times. The main water shut-off should only be turned off once. The gas line should only be shut off once.
Always match the thermal expansion tank pressure to the water heater pressure. Home water pressure should be 50-70 psi.