Re: Are Sierra thermostats OK?

[DAN ANDERSON]

Sierra is apparently making a stainless steel thermostat #18-3543 (housing). They were not doing that a few years ago, but they also make their brass bodied thermostat #18-3553. That is part of the confusion. BRP/OMC use to make a brass bodied thermostat #378065, but it has ss to #5005440 which has a stainless steel body. The pellets appear to be of different materials, but I’m not sure what they are. Sierra’s looks like brass while BRP/OMC’s may have a coating on it.
Of course there is a price difference between the brass stat & the SS stat. Also a difference in the BRP/OMC stat & Sierra price. I personally prefer the SS stats regardless of the type of water run in. Small price to pay for better protection.
We have talked lately about our older motors not polluting as much when we can help it. Running a properly functioning cooling system (with thermostat) is part of what we can do as our responsibility. The motors run better this way as designed.

Dan in TN