I have a Weil McLain boiler that's about 20 years old. Over the past few years, it has become louder and louder....percolating. I've cleaned the flue, heat exchanger, burners...no change. I tried some de-scaler and that didn't help either. I'm thinking it's time for a replacement boiler.
As far as the size of the replacement, should I just try to match up the size to the old one, or should I actually do the heat loss calcs? I think that the addition to the house was done after this current boiler was installed. Since I have lived here we have replaced all the remaining single-pane windows with loE windows. Does anyone have any links to something that helps do the calcs?
Thanks, Scott