On 8 Mar 2006 11:58:14 -0800, someone wrote:

My thought on the cracked coil would be that if it is cracked you
should see water leaking.

Water leaking to WHERE? The coil is internal to the boiler chamber,
it is surrounded by boiler water, where would one see a leak?
(Really, if there is someplace, I'd like to know, I've seen this
situation and there was no visible leak anywhere external.)

And if it is cracked, then you will most
likely be getting boiler hot water into your domestic hot water. Is
your hot water brown or dirty looking?

Not necessarily. The pressure would be the other way around, as
domestic water is often around say 60 psi and a low pressure
residential boiler nowhere near that. But, I'm not sure I'm getting
how his indirect tank is plumbed - was it the FEED coming off the
domestic coil, or was it the CIRCULATION?


As for the pressure relief valve. Check your automatic fill valve. It
may need to be replaced. Depending on your water, the valve may be
stuck open a liitle causing your boiler to fill and raise the pressure.

But that is pretty much what would happen with a cracked coil (if the
coil was indeed the domestic feed at domestic pressure), causing
higher pressure water to seep into the boiler thus over-filling it????





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