1. Iím looking to replace my only natural gas boiler with something more efficient and have been in the process of getting bids. The house was built around 1905 and uses the old cast iron rads. Iíve been leaning towards a high efficiency (90%-97%) Weil-McLain. Iíve been going back and forth between the modulating and not. So my first question is that. What should be considering when choosing between modulating and non-modulating.
2. Secondly, I had a contractor in today and recommended against any of the high efficiency boilers instead recommending that I go with something in the 80ís. Again he suggested Weil-McLain and then the Aruba 3 by Crown Boiler. Does anyone have experience with Crown?
3. My third questions comes from his reason not to go high efficiency. He stated that since Iím running an old system that the rust from the water could gum up the aluminum heat exchanger so Iíd be better going with a cast iron heat exchanger. Has anyone every heard of this?