Thanks. You guys actually bring up the two questions I considered asking, and thanks for those links, Opie.
1 - So- yeah- is there a place for this drain in the exhaust system?
Like I mentioned, when I skimmed the forum debate on the subject the vote was mainly ‘nay’.
People figured that any water trapped in that drain coil would evaporate pretty fast during use of the heater. I’m really inclined to agree since the exhaust pipe gets plenty hot.
On the other side- it’s really hard to imagine much CO flowing downhill through that little tube during use, when there is such a large blast of hot gases rising up the pipe.
What about condensation
and drainage? The exhaust pipe is stainless obviously, so corrosion
is not really an issue. I’m not sure if water could pool enough in it to cause a blockage, but as mentioned, if it did I’m sure the heater would find a way to let me know about it.
The PO apparently managed fine for a couple decades with that drain in place. I guess he may have suffered CO induced brain damage, but- that actually does have certain nautical advantages...
If I’m tempted to try the drain I’ll obviously see what our CO monitors think about it.
2 - Any crafty tricks out there for refilling and purging the line? We used the heater’s manual override function to run the fuel pump
until the line was full. I don’t know for sure, but speculate that running it dry like this a few times is what eventually caused it to crap out.
I also tried refilling the line with a syringe but this was not as pleasant or effective an experience as I’d hoped...
I had some thought of putting a squeezy bulb in the fuel line, as for an outboard engine
. When the new heater gets here I’ll put a little more thought into this.
I was interested to dissect and try to repair
the old Webasto, but the control unit seems to be missing (where could it have gone?) and while new ones are available out there, they’re predictably expensive, so not worth buying
just to test a dead heater.