We will have a new gas-fired boiler installed (either the Slant Fin Galaxy at 82.7% AFUE or the Viessmann Vitogas-50 at 83.7% AFUE) in our 2000 sq. ft., 98,000 heat loss home. We have hot water heating and cast iron radiators.
The contractor we're considering does not want to install Outdoor reset, as he says that this would cause overheating. What is the risk of overheating caused by this control? Can anything be done to prevent this? Can we boost the efficiency of our boilers by adding outdoor reset? The heating guys are offering one high-efficincy boiler, but it is not practical because in case of breakdown, replacement parts will have to be shipped from overseas. Any help would be appreciated, Thanks.