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Would there be a problem with installing a raypak copper tube bo
Would a problem be created in installing a copper tube boiler for a old cast iron radiator system (now working with a circulating pump) House is three stories with 2 1/2 and 3 in mains and do not know if it was ever a gravity system. Would new boiler need a bypass or a primary/secondary arrangement. The system pump (which would also be the boiler pump) has been sized for the longest run in this very large (9,000 sq ft) and very old (90 yrs) house. The proposed boiler (Raypak) is 100% modulating down to 20 % of full firing rate. There is a large CI sectional boiler there now. Owner wants a significant lowering of gas bills
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