Quote:
Originally Posted by jimbo2012
Those of you that have our Nova Whole House filter have 2 pressure gauges built in.
One of the advantages is they will tell you very easily if your expansion tank failure is eminent
here's the way it happens everyday the pressure is say 60-70 psi, then you notice it's 90-125 ( or maxed out)
It means the rubber bladder inside the expansion tank ruptured or has a tear. 
It must be replaced to avoid a leak inside the home.
The problem is the original installer IMO never pressurized the tank to 65psi from the preset pressure of usually 35-40psi.
so at the lower psi that bladder just doesn't last 10+ years because the bladder gets stretched
Be sure the plumber sets that psi before installation or it may happen again, there is a schrader valve on the tank that bike pump can be used with tire gauge.
It costs about $150-$200 for the parts & labor.
But if you're handy it is an easy DIY job cost $45 at Lowes for tank, U need two wrenches 20 minutes
Without a pressure gauge in the system no way to warned
I get 2 or 3 calls a month relating to high psi readings and that's only from our customer base with the filter, so it happens a lot
One other tip when the tank fails you can tap on it there should be half water/half air, if it sounds the same by tapping on it it's full of water
,I read someplace the number one insurance claim cause is HW tank failures flooding
One thought is it just replace it after 5 years with the correct pressurized expansion tank.
PS: we do not replace those tanks
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I agree 100% - the problem is the hot water expansion tanks were never set to the actual water pressure in the home when they were originally installed. They were left at the factory pre-set pressure which is too low, which will cause them to fail prematurely. The hot water tank will also eventually fail because up the pressure build up. This a very simple procedure that if done when the water heater and it's expansion tank was installed, would add years to the life of the hgot water heater and the expansion tank.