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Question DetailsAsked on 10/24/2015

Converting 2 family investment property from oil to gas. Should I go with standard or condensing gas boiler?

My house is a 2 family investment property and I do not live there. There are tenants in both units who pay their own utilities. The home presently has 2 old tankless oil boilers; forced hot water. Domestic water is heated from the oil - no hot water tanks. I want to convert to gas heat and add 2 hot water tanks. As a landlord, I want systems that are reliable, last long and need little maintenance. Efficiency not too important. Leaning towards 2 standard boilers in either 85 or 90% efficiency but most plumbers are quoting combination condensing boilers. The home is in Northeast and in a town with very rusty H2O. I have prices on combi systems ranging from 15K to 21K inc install 94% eff on brands as Viesman, Lochinvar & triangle tube. On standard boilers, received pricing & install at 15K on either Weil Mclain or Burnum. Should go with 2 standard boilers with separate hot water tanks or 2 condensing combi systems? What brands are best? Could rusty water wear out combi system?

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