Sweating it won't work.

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Now I remember why I didn't already replace the valve.  It is on galvanized piping.  All copper outdoors, but when it enters the house, it is galvanized.  Why?  Anyway.

After a bit of digging, more than what was already done, the notion is to go pex.  The minimum is a pex expander, and possibly parts or a parts kit if they have it.  Well, and valves.  The thing is, once that is in, any other work with it is very easy.  The expense may keep that from happening today, though.  Will... find out.

Essentially, just looking at a pump, and parts for the water heater.  I will look at pex, but probably not buy.  I want the expand, not crimp, sort.  I've just heard better things about the expander pex, in both the long run and regarding installation.  Ugh.  Oh, best make a call, see if they still have a line, and if they can tell me what parts are needed.  Otherwise, perhaps, two trips to town?  Bleh.  Later.