boiler installed in the attic, should there be some water in the pan that's under the boiler?
I've never seen a boiler in an attic. However I've installed many furnace/ AC air handlers in attics. In that application, yes you need an extra pan under the the air handler (only if AC is used). The air handler has it's own built in pan, but you you want an auxiliary pan under that in case the main main ever fails. We would run that pipe to the soffit outside. That way if you see water coming out of there, you know your main pan is clogged or faulty. If you have no problems you should never see any water there. This will prevent any ceiling damage in the event of a leak.
Nope, if you've got water you've got a problem. I'd suggest calling a plumber in before you have a big flood.
