I know this has been somewhat addressed in recent posts but I wasn't able to get everything I needed from them. I just had a new house built with a 66 gallon elec water heater. The county has a dual check valve at the meter therefore it's a closed system. Right after moving in we noticed water in the catch pan and called the plumber back out and he determined it to be a faulty water heater. After 3 months he finally came out to replace it. He hadn't been gone long when i looked in the pan and found more water. I drained off all the hot water and put a bucket under the pressure relief valve on the water heater and turned it back on. Sure enough it popped off again shortly which meant there was somewhere in the neighborhood of 150 psi in the entire system. I put a 100 psi gauge on a outside spigot and it pegged it. So I now know I need a expansion tank but not sure how big it should be or what type. Does the regular water pump tanks hold up to the pressure and hot water? Installation wise we were looking at putting it directly above the water heater so if it leaks the pan will catch it. Any advice would be great. I have pex plumbing and it's only rated to 165 so I'm cutting it real close. Help please.
Here's info on sizing expansion tanks ...
http://www.watts.com/pro/divisions/watersafety_flowcontrol/support/support_DETsizing.htm
And here's info on expansion tank products from Watts ...
http://www.wattsreg.com/scripts/pro-products.watts?_cfg=./db/pro-products.cfg&_fil=cat2%3d'Expansion_Tanks'.and.cat1%3d'Water_Heater_Installation_Products'.and.div%3d'_watersafety-flowcontrol'&_sn=pro-products&_tar=_view5_watersafety-flowcontrol
Here's info on sizing expansion tanks ...
http://www.watts.com/pro/divisions/watersafety_flowcontrol/support/support_DETsizing.htm
And here's info on expansion tank products from Watts ...
http://www.wattsreg.com/scripts/pro-products.watts?_cfg=./db/pro-products.cfg&_fil=cat2%3d'Expansion_Tanks'.and.cat1%3d'Water_Heater_Installation_Products'.and.div%3d'_watersafety-flowcontrol'&_sn=pro-products&_tar=_view5_watersafety-flowcontrol
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