bmclaug264
New Member
I have been using my W-M Ultra 2 105 for just over a year. Seems to work fine and because it was added as a replacement to a 1960's W-M when we made an addition doubling our square footage to 2,300 and the gas bill stayed almost the same, we are happy. I have the outdoor temperature sensor installed and it does adjust the Outlet water temp, but I have to wonder, are the default settings of 190 the best or should I drop it to 150 and let it adjust itself based on call to whatever? It must cost me more to heat to 190 every time? Thanks