In fairness to all, we don't discuss pricing on the Wall. Thanks for your cooperation.
From time to time I see a post here about needed a replacement for a HS2109 boiler control.
Now I have an issue w/ the one and only one if these I have ever installed.
I must say I am quite dissappointed has no direct replacement for this other than the 2107.
IF you use the 2107 do you need to use the outdoor reset feature?
Getting a sensor through to the outside on this building is a difficult undertaking and is not needed.