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Dazed and Confused; Outdoor Temp Reset Controller

I am meeting with hydronic heating system contractors on replacing an old natural gas boiler with (their recommendations) a Burnham or Weil-McLain conventional (non-condensing), direct-vent boiler. So far so good, until one of the contractors recomends (and prices) the addition of a Tekmar 260 control to the Burnham. I don't get it, my 2000 sf home in northern VA is heated thru a single zone, monoflow t loop with free standing cast iron radiators and a programable interior thermostat. What will the addition of the Tekmar 260 add by way of greater efficiency to the new boiler in the existing heat distribution system? Any thoughts on if this is a good idea for me in heating my home or just the contractor in selling a new unit. Thxs.
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