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My 36 year old Burnham 2 series has a hole that is not repairable. I've gotten two bids on having a Burnham 3 series installed. The first bid includes the all of the IQ options, but they don't include a new expansion tank or air purge. They said the tank is not needed, but it is the original that was installed 36 years ago. The second bid , which was less than the first, includes an expansion tank, air purge, auto fill, ECM pump, and fancy new thermostat, but not the IQ options. The outdoor reset IQ option is extra. Our system has the old cast iron radiators and big iron pipes in the basement. Some of these pipes are covered in asbestos. I was interested in switching this all to PEX or something similar so the asbestos pipes could be bypassed, cut out, and removed, but they thought It would cost far less to use the same pipes and have a company remove the asbestos from them. I also wanted to add a second zone to our upstairs, but this sounds very costly because the system is not piped for it. They recommended installing thermostatic valves upstairs. Both did heat loss calculations. The first one was 60 @ -15 and the second was 79 @ -16 which seems like a pretty big margin. Both recommended the Burnham model 304 which is a little over sized, but the next smallest model would probably be too small to keep up if we have another Minnesota winter like the last. They both have similar warranties and both have lots of experience with installations. One concern I have is an ECM pump with cast iron radiators. Would it be better if I can get them to throw in a magnetic filter, or just have them install the an old style fixed speed? What other questions should I be asking them? I had no idea switching to PEX would cost so much. Should I stick with the old steel pipes? Is a new expansion tank needed? Please let me know your thoughts. I'd appreciate any advise. Thanks.