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Water heater changes

Old 02-05-2018, 06:52 AM
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Default Water heater changes

I lived in my house for almost 30 years. I first changed my water heater 15 years ago and again recently. I never had a problem with the relief valve discharging before and I never had an expansion tank on the system. Now it seems in need one because the relief valve lifts occasionally. What gives?
Old 02-05-2018, 07:04 AM
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Last time I replaced a HWH, the plumber said an expansion tank was required by code

I also had a pan put under the HWH and ran PVC from the pan to the sump crock in case the HWH ever ruptured
Old 02-05-2018, 07:10 AM
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Originally Posted by SeaBoss21 View Post
I lived in my house for almost 30 years. I first changed my water heater 15 years ago and again recently. I never had a problem with the relief valve discharging before and I never had an expansion tank on the system. Now it seems in need one because the relief valve lifts occasionally. What gives?
Do you have a backflow preventer?
Old 02-05-2018, 08:46 AM
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Maybe the new relief valve is bad, probably Chinese shit to begin with.
Old 02-05-2018, 09:05 AM
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Originally Posted by SeaBoss21 View Post
I lived in my house for almost 30 years. I first changed my water heater 15 years ago and again recently. I never had a problem with the relief valve discharging before and I never had an expansion tank on the system. Now it seems in need one because the relief valve lifts occasionally. What gives?
Check you water pressure on a faucet. It should be around 50psi.
Old 02-05-2018, 09:16 AM
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Originally Posted by Lone Ranger View Post
Maybe the new relief valve is bad, probably Chinese shit to begin with.
X2
Old 02-05-2018, 09:20 AM
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get a new valve
Old 02-05-2018, 09:29 AM
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They are TP valves, temperature and pressure.
Old 02-05-2018, 09:43 AM
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Are you on city water? Chances are they changed their meter setter that has checks built into it... This will cause a T&P to discharge when the tank is heating if there is no thermal expansion tank or thermal expansion valve.
Old 02-05-2018, 09:44 AM
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Backflow device is present. You need a tank. Your T&P is working as designed, relieving pressure. Bet it’s NOT Chinese !

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