Re: Are Sierra thermostats OK?

[collectorinspector]

quote FrankR:

But I still go back to my original question. If the ‘stat does not have a notched poppet, how can the water flow up from the cavity that it sits in, and if it can’t flow, how does it present itself to the pellet? Unless the gap in the cap is supposed to leak enough to let some through. Seems iffy to me. I still think it needs a notched poppet.

No "iffy".

Thermostats control the varying flow of water through a block in a lump, or just control the maximum head temperature letting general flow do the rest as per what the maker intended.

Thermostats do not control air which is displaced from a system such as those discussed under water pump pressures throughout the system.

No wheel to invent here.

There have been some excellent posts above so maybe revisit them aye.

I maintain that a thermostat is a vital part of the whole.

C.I.