Re: Are Sierra thermostats OK?

[amuller]

Thanks for the comments. I am not in any doubt that thermostatically controlled cooling systems are a good idea. I would not consider leaving out the thermostat. (I’m in Minnesota where water is often cold, but would feel the same if I were in Florida.) Just looked on Amazon and the 18-3553 (brass) is $11.07 and the 18-3543 (SS, and the one I bought) is $17.18. Pretty noticeable difference. The BRP thermostat 5005440, which if the pic is correct is a brass one, costs $23.36. (All prices shipping included) I am not sure what the underlying failure modes of thermostats are. I see them failed open mostly but don’t know what’s going on. In general brass does not do well in sea water as the zinc fraction tends to go away.

I do object to paying $6-8 for the little mounting ring.