Did you scroll down for the other applications? There are literally hundreds of auto air venting valves for ANY hot water system application.

Google auto air vent valves for water heaters.

=nampcy;3761051]I am using a electrical hot water tank for hot water only... so not sure if this will work. It looks like these are meant for a radiant heating system.. But worth asking the plumber. Thanks for the link[/QUOTE]

Nampcy,
Yes, you are correct, these type of devices are meant for use to vent gases in closed hydronic / radiant systems where the fluid is rendered inert by repeated heatings and mostly void of minerals / sediment / suspended particles that can foul the float & burp mechanism...

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Originally Posted by hkstroud

Never heard of an well tank that small. That sounds more like an expansion tank for the water heater.

Show us photos of that tank and tell us what pipes are connected to it.
Show us the well pump pressure switch. Show us photos of all piping.

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If it's a constant pressure well system the tank would be that small.